diff --git a/composer.json b/composer.json
index 5a29b856..7b1b3e08 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
   "require": {
     "ext-json": "*",
     "guzzlehttp/guzzle": "^6.3|^7.0",
-    "php": "~7.1",
+    "php": "~7.1|^8",
     "symfony/filesystem": ">=2.3",
     "symfony/process": ">=3.3",
     "wrench/wrench": "~2.0.10"
@@ -29,8 +29,8 @@
   "require-dev": {
     "jakub-onderka/php-parallel-lint": "~1.0.0",
     "nette/php-generator": "~2.1|~3.0",
-    "phpstan/phpstan": "^0.11.4",
-    "phpunit/phpunit": "~6.4"
+    "phpstan/phpstan": "^1.3",
+    "phpunit/phpunit": "^9.5"
   },
   "autoload": {
     "psr-4": {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXNode.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXNode.php
index 84429e58..cdc9ccc6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXNode.php
@@ -131,7 +131,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXProperty.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXProperty.php
index 0fa9a528..428890c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXProperty.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXProperty.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXRelatedNode.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXRelatedNode.php
index babbaf5e..b0db2636 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXRelatedNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXRelatedNode.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backendDOMNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValue.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValue.php
index 7e205815..3f0d943b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValue.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValue.php
@@ -65,7 +65,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValueSource.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValueSource.php
index cffc2f03..9f3ea4d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValueSource.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/AXValueSource.php
@@ -109,7 +109,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesRequest.php
index 6fa09897..cc0459b9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesResponse.php
index 75e0289a..962e5734 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetChildAXNodesResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeRequest.php
index 3904e879..9491e32d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->depth !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeResponse.php
index c91472bf..8710d1bc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetFullAXTreeResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeRequest.php
index 812d24f9..d0592075 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeResponse.php
index a29d959d..11d95f81 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/GetPartialAXTreeResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeRequest.php
index 3d3c5f3f..cc8d415a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeResponse.php
index c31c5e0f..9aad589f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Accessibility/QueryAXTreeResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/Animation.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/Animation.php
index c2b19107..0afeb8b9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/Animation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/Animation.php
@@ -119,7 +119,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCanceledEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCanceledEvent.php
index 5d3066ba..c6604b6d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCanceledEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCanceledEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCreatedEvent.php
index fc25bbcb..5f198891 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationCreatedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationEffect.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationEffect.php
index f4bdf9bb..b6f71bbb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationEffect.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationEffect.php
@@ -119,7 +119,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->delay !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationStartedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationStartedEvent.php
index a96bbe13..94b22bbc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationStartedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/AnimationStartedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animation !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeRequest.php
index 62a36802..f7c3592b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeResponse.php
index 3dad7ada..9df80077 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetCurrentTimeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->currentTime !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetPlaybackRateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetPlaybackRateResponse.php
index 13b0a8c5..6de8a705 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetPlaybackRateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/GetPlaybackRateResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playbackRate !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframeStyle.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframeStyle.php
index 4dadb651..be38a3bc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframeStyle.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframeStyle.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->offset !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframesRule.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframesRule.php
index b97fa3d7..88301ea8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframesRule.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/KeyframesRule.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ReleaseAnimationsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ReleaseAnimationsRequest.php
index 28a2910b..d8ea7e93 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ReleaseAnimationsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ReleaseAnimationsRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationRequest.php
index ba7da4e7..fdc696be 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animationId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationResponse.php
index 5b0dd6b5..bb75b565 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/ResolveAnimationResponse.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->remoteObject !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SeekAnimationsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SeekAnimationsRequest.php
index 3846eb7e..48f1f80b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SeekAnimationsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SeekAnimationsRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPausedRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPausedRequest.php
index 6db64a99..aeb2c835 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPausedRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPausedRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPlaybackRateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPlaybackRateRequest.php
index 5e2c9d8e..9514962d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPlaybackRateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetPlaybackRateRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playbackRate !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetTimingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetTimingRequest.php
index 960e00dc..45e1f5ad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetTimingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Animation/SetTimingRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animationId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedCookie.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedCookie.php
index 7847256c..064a8c41 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedCookie.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedCookie.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedFrame.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedFrame.php
index f8530786..b49474b0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedFrame.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedFrame.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedRequest.php
index df4ade19..dda0dc5f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AffectedRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AttributionReportingIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AttributionReportingIssueDetails.php
index 367e7d0a..739e4150 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/AttributionReportingIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/AttributionReportingIssueDetails.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->violationType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/BlockedByResponseIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/BlockedByResponseIssueDetails.php
index 03631b17..aa1ff85f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/BlockedByResponseIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/BlockedByResponseIssueDetails.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->request !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/CheckContrastRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/CheckContrastRequest.php
index e343f8ee..a84e602d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/CheckContrastRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/CheckContrastRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->reportAAA !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/ContentSecurityPolicyIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/ContentSecurityPolicyIssueDetails.php
index 78f6b9f5..3f1c9a83 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/ContentSecurityPolicyIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/ContentSecurityPolicyIssueDetails.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->blockedURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/CorsIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/CorsIssueDetails.php
index d55a6032..57ae7852 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/CorsIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/CorsIssueDetails.php
@@ -64,7 +64,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->corsErrorStatus !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GenericIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GenericIssueDetails.php
index 0ce5a086..cf63200a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GenericIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GenericIssueDetails.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->errorType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseRequest.php
index 03d679b2..1cb5c4b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseResponse.php
index c3ec1d60..3fbd9069 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/GetEncodedResponseResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->body !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/HeavyAdIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/HeavyAdIssueDetails.php
index 732e8316..f492e82b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/HeavyAdIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/HeavyAdIssueDetails.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->resolution !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssue.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssue.php
index db59845e..312077c9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssue.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssue.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->code !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssueDetails.php
index 5b30cd9a..8e9b6662 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/InspectorIssueDetails.php
@@ -103,7 +103,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sameSiteCookieIssueDetails !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/IssueAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/IssueAddedEvent.php
index 86144dc2..5a893972 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/IssueAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/IssueAddedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->issue !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/LowTextContrastIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/LowTextContrastIssueDetails.php
index f8d45362..f66c21bb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/LowTextContrastIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/LowTextContrastIssueDetails.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->violatingNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/MixedContentIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/MixedContentIssueDetails.php
index 19208fee..58cf0044 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/MixedContentIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/MixedContentIssueDetails.php
@@ -79,7 +79,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->resourceType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/NavigatorUserAgentIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/NavigatorUserAgentIssueDetails.php
index 8040a658..d03e59b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/NavigatorUserAgentIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/NavigatorUserAgentIssueDetails.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/QuirksModeIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/QuirksModeIssueDetails.php
index 2880b48e..ddad6c33 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/QuirksModeIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/QuirksModeIssueDetails.php
@@ -53,7 +53,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->isLimitedQuirksMode !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SameSiteCookieIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SameSiteCookieIssueDetails.php
index 353f2b7b..bedcb34d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SameSiteCookieIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SameSiteCookieIssueDetails.php
@@ -87,7 +87,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookie !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SharedArrayBufferIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SharedArrayBufferIssueDetails.php
index 5b9d9368..e7d382a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SharedArrayBufferIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SharedArrayBufferIssueDetails.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sourceCodeLocation !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SourceCodeLocation.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SourceCodeLocation.php
index 6ca9b52f..1a156668 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/SourceCodeLocation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/SourceCodeLocation.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/TrustedWebActivityIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/TrustedWebActivityIssueDetails.php
index 8a3f0437..515fefaa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/TrustedWebActivityIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/TrustedWebActivityIssueDetails.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Audits/WasmCrossOriginModuleSharingIssueDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Audits/WasmCrossOriginModuleSharingIssueDetails.php
index 7a40712f..e434d9a5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Audits/WasmCrossOriginModuleSharingIssueDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Audits/WasmCrossOriginModuleSharingIssueDetails.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->wasmModuleUrl !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEvent.php
index b7e2cd12..200a686c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEvent.php
@@ -92,7 +92,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEventReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEventReceivedEvent.php
index 50ce2116..1db30897 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEventReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/BackgroundServiceEventReceivedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backgroundServiceEvent !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/ClearEventsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/ClearEventsRequest.php
index e11c5e9b..c95ae916 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/ClearEventsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/ClearEventsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->service !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/EventMetadata.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/EventMetadata.php
index c47090a7..db900ce4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/EventMetadata.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/EventMetadata.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->key !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/RecordingStateChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/RecordingStateChangedEvent.php
index c504e691..35474c1f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/RecordingStateChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/RecordingStateChangedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->isRecording !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/SetRecordingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/SetRecordingRequest.php
index b900fb4a..86ccf628 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/SetRecordingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/SetRecordingRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->shouldRecord !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StartObservingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StartObservingRequest.php
index 4116d4fa..62d6fd7e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StartObservingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StartObservingRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->service !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StopObservingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StopObservingRequest.php
index 29037844..be31d9e2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StopObservingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/BackgroundService/StopObservingRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->service !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bounds.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bounds.php
index 56ed3286..490352c4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bounds.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bounds.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->left !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bucket.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bucket.php
index f88916fd..6c5fdcc6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bucket.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Bucket.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->low !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/CancelDownloadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/CancelDownloadRequest.php
index 08bb945a..634d6e99 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/CancelDownloadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/CancelDownloadRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->guid !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadProgressEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadProgressEvent.php
index bd8f86ab..6cd8c2be 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadProgressEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadProgressEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->guid !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadWillBeginEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadWillBeginEvent.php
index 8704aed9..b0a7cc8f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadWillBeginEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/DownloadWillBeginEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/ExecuteBrowserCommandRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/ExecuteBrowserCommandRequest.php
index 7571d4d7..e768d59a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/ExecuteBrowserCommandRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/ExecuteBrowserCommandRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->commandId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetBrowserCommandLineResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetBrowserCommandLineResponse.php
index ca2034a0..9042ee4a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetBrowserCommandLineResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetBrowserCommandLineResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->arguments !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramRequest.php
index 7d545375..c95ad5b2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramResponse.php
index e3aab0b2..c3d5d958 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->histogram !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsRequest.php
index 099e7614..791cf7d9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->query !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsResponse.php
index 27ea084a..4d721531 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetHistogramsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->histograms !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetVersionResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetVersionResponse.php
index 93fc016d..dcb5ba0d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetVersionResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetVersionResponse.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->protocolVersion !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsRequest.php
index 5f6d8687..31b9f947 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->windowId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsResponse.php
index 38a0fc51..a1f80f9f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowBoundsResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->bounds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetRequest.php
index f7a278af..940c3ca4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetResponse.php
index ca704b7c..b89e37c3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GetWindowForTargetResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->windowId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GrantPermissionsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GrantPermissionsRequest.php
index 55126d2a..1529201a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/GrantPermissionsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/GrantPermissionsRequest.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->permissions !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Histogram.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Histogram.php
index 22d91e5d..4b22ef92 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/Histogram.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/Histogram.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/PermissionDescriptor.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/PermissionDescriptor.php
index 87dc7b3a..e3b7c771 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/PermissionDescriptor.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/PermissionDescriptor.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/ResetPermissionsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/ResetPermissionsRequest.php
index 933cd24b..aa27963c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/ResetPermissionsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/ResetPermissionsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDockTileRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDockTileRequest.php
index 50ae6423..a51ee8ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDockTileRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDockTileRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->badgeLabel !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDownloadBehaviorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDownloadBehaviorRequest.php
index 976a3f93..f76f8fdb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDownloadBehaviorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetDownloadBehaviorRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->behavior !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetPermissionRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetPermissionRequest.php
index f022b7b7..52db2819 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetPermissionRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetPermissionRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->permission !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetWindowBoundsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetWindowBoundsRequest.php
index 4fbcbacc..c434b7fd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetWindowBoundsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Browser/SetWindowBoundsRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->windowId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleRequest.php
index f562cb99..2eb27436 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleResponse.php
index 681f9685..0d634861 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/AddRuleResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rule !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSComputedStyleProperty.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSComputedStyleProperty.php
index 61ad98d8..6e5e0312 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSComputedStyleProperty.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSComputedStyleProperty.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSContainerQuery.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSContainerQuery.php
index 9b5feee3..96fb3c1a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSContainerQuery.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSContainerQuery.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframeRule.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframeRule.php
index 89bd12ef..680759ed 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframeRule.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframeRule.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframesRule.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframesRule.php
index 16a04e7d..9754f4ba 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframesRule.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSKeyframesRule.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->animationName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSMedia.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSMedia.php
index 0f44f596..632f782b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSMedia.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSMedia.php
@@ -82,7 +82,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSProperty.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSProperty.php
index af78a046..f03d5551 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSProperty.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSProperty.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSRule.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSRule.php
index 1eda24bd..cd5ddf18 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSRule.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSRule.php
@@ -85,7 +85,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyle.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyle.php
index 4e5493e6..edca4303 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyle.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyle.php
@@ -75,7 +75,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyleSheetHeader.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyleSheetHeader.php
index c9b6c5a8..d0f16dc5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyleSheetHeader.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CSSStyleSheetHeader.php
@@ -189,7 +189,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesRequest.php
index 19e75251..9b19234c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesResponse.php
index 14ef315f..0bd69b7f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CollectClassNamesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->classNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetRequest.php
index 634ab650..8dfe3ca7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetResponse.php
index 048e5010..d2fe45bf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/CreateStyleSheetResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontFace.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontFace.php
index 416db1f4..279aa11e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontFace.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontFace.php
@@ -112,7 +112,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->fontFamily !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontVariationAxis.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontVariationAxis.php
index 28d9457c..b7d7b660 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontVariationAxis.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontVariationAxis.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->tag !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontsUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontsUpdatedEvent.php
index b48925ff..c3bed0f7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontsUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/FontsUpdatedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->font !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/ForcePseudoStateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/ForcePseudoStateRequest.php
index 5d8f054b..ce09def8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/ForcePseudoStateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/ForcePseudoStateRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsRequest.php
index be888e40..cdcbce9e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsResponse.php
index ea37db18..7f1b1f95 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetBackgroundColorsResponse.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backgroundColors !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeRequest.php
index 747a5459..d0876e8b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeResponse.php
index 4d72407a..ee9e9ab5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetComputedStyleForNodeResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->computedStyle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeRequest.php
index d97a7f44..a28f1f7a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeResponse.php
index 1728c3c1..33293b73 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetInlineStylesForNodeResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->inlineStyle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeRequest.php
index c767e5ea..61c74346 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeResponse.php
index 79a15e05..66825ed9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMatchedStylesForNodeResponse.php
@@ -91,7 +91,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->inlineStyle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMediaQueriesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMediaQueriesResponse.php
index 76f5d187..658af89f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMediaQueriesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetMediaQueriesResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->medias !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeRequest.php
index 7188b31f..aa40c205 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeResponse.php
index 45d75996..095afc01 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetPlatformFontsForNodeResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->fonts !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextRequest.php
index 451585f5..e4d6ad27 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextResponse.php
index d82e9284..5ef8cacf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/GetStyleSheetTextResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/InheritedStyleEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/InheritedStyleEntry.php
index ecce93d7..ed4efb4d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/InheritedStyleEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/InheritedStyleEntry.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->inlineStyle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQuery.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQuery.php
index ca74b558..43ea3472 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQuery.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQuery.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->expressions !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryExpression.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryExpression.php
index 6a558187..81a23b93 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryExpression.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryExpression.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryResultChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryResultChangedEvent.php
index 13f11ec7..405e5ae9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryResultChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/MediaQueryResultChangedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/PlatformFontUsage.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/PlatformFontUsage.php
index 56aea8b7..00f74bfd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/PlatformFontUsage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/PlatformFontUsage.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->familyName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/PseudoElementMatches.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/PseudoElementMatches.php
index 280a0bb3..d694a557 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/PseudoElementMatches.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/PseudoElementMatches.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->pseudoType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleMatch.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleMatch.php
index 4b922b82..d1b67070 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleMatch.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleMatch.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rule !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleUsage.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleUsage.php
index 3949d1ba..ac717d3a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleUsage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/RuleUsage.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SelectorList.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SelectorList.php
index 5ef4848b..27832173 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SelectorList.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SelectorList.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->selectors !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextRequest.php
index 22ee005c..540d8616 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextResponse.php
index 9b6ecefd..c14ffd66 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetContainerQueryTextResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->containerQuery !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetEffectivePropertyValueForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetEffectivePropertyValueForNodeRequest.php
index e6abcac7..d5b85b31 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetEffectivePropertyValueForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetEffectivePropertyValueForNodeRequest.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyRequest.php
index b7479bfb..dcfe9de5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyResponse.php
index 83774e1a..940e8e1b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetKeyframeKeyResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->keyText !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetLocalFontsEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetLocalFontsEnabledRequest.php
index c12d1f45..5491f45f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetLocalFontsEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetLocalFontsEnabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextRequest.php
index c77bf405..87bd9c9e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextResponse.php
index e5a5f729..ac315e93 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetMediaTextResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->media !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorRequest.php
index bd7d3dbf..4419d59b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorResponse.php
index 7ef13773..42789cdc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetRuleSelectorResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->selectorList !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextRequest.php
index 61826467..a9a43199 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextResponse.php
index de295719..77d0eda7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleSheetTextResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sourceMapURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsRequest.php
index b520ee55..ee8c1712 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsRequest.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->edits !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsResponse.php
index 3e54fc39..a85526ed 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SetStyleTextsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styles !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/ShorthandEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/ShorthandEntry.php
index fbebd042..9b73946e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/ShorthandEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/ShorthandEntry.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SourceRange.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SourceRange.php
index 5fdacbfa..7a717a85 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/SourceRange.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/SourceRange.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->startLine !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StopRuleUsageTrackingResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StopRuleUsageTrackingResponse.php
index 0804ffae..a4087266 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StopRuleUsageTrackingResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StopRuleUsageTrackingResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->ruleUsage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleDeclarationEdit.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleDeclarationEdit.php
index 00ff7592..810107d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleDeclarationEdit.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleDeclarationEdit.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetAddedEvent.php
index b07b2ce4..1ea5e5ff 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetAddedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->header !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetChangedEvent.php
index e53797af..96186ebb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetChangedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetRemovedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetRemovedEvent.php
index e91e5401..e3ee37dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetRemovedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/StyleSheetRemovedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->styleSheetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeComputedStyleUpdatesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeComputedStyleUpdatesResponse.php
index a1e109c3..0961fd6c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeComputedStyleUpdatesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeComputedStyleUpdatesResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeCoverageDeltaResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeCoverageDeltaResponse.php
index ede066f2..03194804 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeCoverageDeltaResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TakeCoverageDeltaResponse.php
@@ -38,7 +38,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->coverage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TrackComputedStyleUpdatesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TrackComputedStyleUpdatesRequest.php
index c70c4e2e..a7d17535 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/TrackComputedStyleUpdatesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/TrackComputedStyleUpdatesRequest.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->propertiesToTrack !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CSS/Value.php b/gen-src/ChromeDevtoolsProtocol/Model/CSS/Value.php
index fc277617..fc7cf0c5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CSS/Value.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CSS/Value.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Cache.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Cache.php
index 74e69192..45aad7ee 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Cache.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Cache.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/CachedResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/CachedResponse.php
index 7e742174..c03a38e4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/CachedResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/CachedResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->body !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DataEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DataEntry.php
index b9602b75..3cd44ce0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DataEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DataEntry.php
@@ -105,7 +105,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteCacheRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteCacheRequest.php
index 70f04065..3c5cdd9f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteCacheRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteCacheRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteEntryRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteEntryRequest.php
index 26f84fd8..d841f0e5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteEntryRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/DeleteEntryRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Header.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Header.php
index 505a12e4..39caea42 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Header.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/Header.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesRequest.php
index 43517e29..7d87da8c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesResponse.php
index 2e359b8c..500b2993 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCacheNamesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->caches !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseRequest.php
index c172fc7b..c3677b5b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseRequest.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseResponse.php
index 329d86cd..e42d847e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestCachedResponseResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->response !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesRequest.php
index b246b2ef..2ddf2cba 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesResponse.php
index bedcad9e..2254acbf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/CacheStorage/RequestEntriesResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheDataEntries !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/EnableRequest.php
index 72370313..0c297a59 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/EnableRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->presentationUrl !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/IssueUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/IssueUpdatedEvent.php
index 111c523b..475e9d43 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/IssueUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/IssueUpdatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->issueMessage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/SetSinkToUseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/SetSinkToUseRequest.php
index 855e82e9..4eb06482 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/SetSinkToUseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/SetSinkToUseRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sinkName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/Sink.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/Sink.php
index e6383d72..bcfd8a87 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/Sink.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/Sink.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/SinksUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/SinksUpdatedEvent.php
index 5e2d5dd3..be7cb450 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/SinksUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/SinksUpdatedEvent.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sinks !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/StartTabMirroringRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/StartTabMirroringRequest.php
index 6c3396a9..5ecf859c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/StartTabMirroringRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/StartTabMirroringRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sinkName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Cast/StopCastingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Cast/StopCastingRequest.php
index c71b9b6c..4166493f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Cast/StopCastingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Cast/StopCastingRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sinkName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Console/ConsoleMessage.php b/gen-src/ChromeDevtoolsProtocol/Model/Console/ConsoleMessage.php
index 38205873..6a400ed4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Console/ConsoleMessage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Console/ConsoleMessage.php
@@ -79,7 +79,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->source !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Console/MessageAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Console/MessageAddedEvent.php
index f3134791..d42d9c25 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Console/MessageAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Console/MessageAddedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeModifiedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeModifiedEvent.php
index b261311d..15e794ef 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeModifiedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeModifiedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeRemovedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeRemovedEvent.php
index 6b34911b..182d948b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeRemovedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/AttributeRemovedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/BackendNode.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/BackendNode.php
index 642f38f8..86a8f903 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/BackendNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/BackendNode.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/BoxModel.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/BoxModel.php
index 97b8580a..02b91765 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/BoxModel.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/BoxModel.php
@@ -101,7 +101,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->content !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CSSComputedStyleProperty.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CSSComputedStyleProperty.php
index d0e7effc..f0bc20d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CSSComputedStyleProperty.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CSSComputedStyleProperty.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CharacterDataModifiedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CharacterDataModifiedEvent.php
index 25e71682..67a0bbb3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CharacterDataModifiedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CharacterDataModifiedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeCountUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeCountUpdatedEvent.php
index 2dbe443e..5963c32f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeCountUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeCountUpdatedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeInsertedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeInsertedEvent.php
index 9405d47b..57c9d88f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeInsertedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeInsertedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeRemovedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeRemovedEvent.php
index 8d7789b5..fbdd1f4b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeRemovedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ChildNodeRemovedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeRequest.php
index ade5deec..01496f97 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeResponse.php
index c45dec2d..5f23b5b7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CollectClassNamesFromSubtreeResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->classNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToRequest.php
index e2a19239..83b0e9fd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToResponse.php
index a36ed20a..b2aa590e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/CopyToResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeRequest.php
index 0496983f..739cafab 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeResponse.php
index 99a7e773..1075e450 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DescribeNodeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->node !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DiscardSearchResultsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DiscardSearchResultsRequest.php
index 08eaefbf..7ccf3e1a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DiscardSearchResultsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DiscardSearchResultsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->searchId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DistributedNodesUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DistributedNodesUpdatedEvent.php
index 458b8a29..9d0f39a5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DistributedNodesUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DistributedNodesUpdatedEvent.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->insertionPointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DocumentUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DocumentUpdatedEvent.php
index b094b552..1b2966a2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/DocumentUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/DocumentUpdatedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/FocusRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/FocusRequest.php
index 8787be60..9602e1fb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/FocusRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/FocusRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesRequest.php
index c6cf98df..44c3a475 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesResponse.php
index 259b9857..a72b1c90 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetAttributesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->attributes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelRequest.php
index fc5dda31..ef967cba 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelResponse.php
index 5bd84d7b..211e5b56 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetBoxModelResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->model !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeRequest.php
index 8e7a5839..16413fd2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeResponse.php
index 7606d45b..4f0b3f06 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContainerForNodeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsRequest.php
index bb195e86..2d5f01ef 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsResponse.php
index 4030501f..bea367f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetContentQuadsResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->quads !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentRequest.php
index d696d124..dbbb52c8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->depth !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentResponse.php
index 00b5a1dc..c6d589f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetDocumentResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->root !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoRequest.php
index af0c14c9..d64cc5e6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoResponse.php
index 86fb0852..7291bb8f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFileInfoResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->path !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentRequest.php
index ba8a9bc7..e9389086 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->depth !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentResponse.php
index df3765a9..dfbcd500 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFlattenedDocumentResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerRequest.php
index 64a21ffc..7fb3666a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerResponse.php
index 2888082f..3198998d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetFrameOwnerResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backendNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationRequest.php
index 3157953b..5b6faed8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationResponse.php
index 7f216bb2..cc5407c5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeForLocationResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backendNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesRequest.php
index c204cefc..53983d53 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesResponse.php
index 5c13e125..76bbc55b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodeStackTracesResponse.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->creation !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleRequest.php
index 64de3a23..3973042f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleRequest.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleResponse.php
index e85e491e..d9c9ddbe 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetNodesForSubtreeByStyleResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLRequest.php
index 4af75a21..d17db7dd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLResponse.php
index 59bf0fdb..46143f55 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetOuterHTMLResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->outerHTML !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerRequest.php
index d5121986..3effd4d3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerResponse.php
index 09760aaf..ef82b241 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetQueryingDescendantsForContainerResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryRequest.php
index 815ddf41..377a4622 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryResponse.php
index 49e82fdb..9137d61e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetRelayoutBoundaryResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsRequest.php
index f5252d88..a189cec6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->searchId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsResponse.php
index 2be3fecc..58f75375 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/GetSearchResultsResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/InlineStyleInvalidatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/InlineStyleInvalidatedEvent.php
index 50dec28d..9da70b6e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/InlineStyleInvalidatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/InlineStyleInvalidatedEvent.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToRequest.php
index c4e5d4b6..e0bb8ce7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToResponse.php
index 6c648d19..ac7d27a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/MoveToResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/Node.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/Node.php
index 478793fd..037f8f34 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/Node.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/Node.php
@@ -320,7 +320,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchRequest.php
index ff3c5e26..cfcaa3f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->query !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchResponse.php
index 513db383..b3b92930 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PerformSearchResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->searchId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementAddedEvent.php
index 3421e2f3..e4a69bda 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementAddedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementRemovedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementRemovedEvent.php
index b58bdc23..d76e9a35 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementRemovedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PseudoElementRemovedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendRequest.php
index e5eea402..18f52174 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->path !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendResponse.php
index 42924e30..40d9e4bf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodeByPathToFrontendResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendRequest.php
index 77fe7a45..9da85ce0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backendNodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendResponse.php
index 81a41a55..45d081a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/PushNodesByBackendIdsToFrontendResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllRequest.php
index 3a1e02fb..bf8b11d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllResponse.php
index 6dc68f07..9634a96a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorAllResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorRequest.php
index bc8935d4..24bb6402 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorResponse.php
index 719561df..98fa3188 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/QuerySelectorResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RGBA.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RGBA.php
index fa766bcd..1a766a2a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RGBA.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RGBA.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->r !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/Rect.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/Rect.php
index 81ff821a..3815a8a4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/Rect.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/Rect.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveAttributeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveAttributeRequest.php
index ded90b41..bf0b81c7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveAttributeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveAttributeRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveNodeRequest.php
index 2bae4b90..756a4eff 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RemoveNodeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestChildNodesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestChildNodesRequest.php
index 6c9159bc..c9c27dfa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestChildNodesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestChildNodesRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeRequest.php
index 81decb01..d2cc9117 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeResponse.php
index d31f305c..c12c6f7d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/RequestNodeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeRequest.php
index 33bcb5eb..0b53ab75 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeResponse.php
index c2db15de..19b6e799 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ResolveNodeResponse.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->object !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ScrollIntoViewIfNeededRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ScrollIntoViewIfNeededRequest.php
index d547845e..23b43c6e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ScrollIntoViewIfNeededRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ScrollIntoViewIfNeededRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributeValueRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributeValueRequest.php
index 8a6c7d1b..330b7cb7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributeValueRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributeValueRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributesAsTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributesAsTextRequest.php
index 965811e9..2274f842 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributesAsTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetAttributesAsTextRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetChildNodesEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetChildNodesEvent.php
index f6a8241d..a6834b22 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetChildNodesEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetChildNodesEvent.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetFileInputFilesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetFileInputFilesRequest.php
index 20021995..0f77b0bf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetFileInputFilesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetFileInputFilesRequest.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->files !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetInspectedNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetInspectedNodeRequest.php
index e40fea92..4c14a662 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetInspectedNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetInspectedNodeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameRequest.php
index 8f83198c..ce378d74 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameResponse.php
index a422ddc8..3dea05f1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeNameResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeStackTracesEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeStackTracesEnabledRequest.php
index 3986e341..21561783 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeStackTracesEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeStackTracesEnabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enable !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeValueRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeValueRequest.php
index 6e9cfdb8..59c6efb4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeValueRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetNodeValueRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetOuterHTMLRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetOuterHTMLRequest.php
index 5b6a5bf6..f88e9d57 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetOuterHTMLRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/SetOuterHTMLRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPoppedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPoppedEvent.php
index 2294caf7..0231fd04 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPoppedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPoppedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->hostId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPushedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPushedEvent.php
index 48d6684b..4d821f10 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPushedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShadowRootPushedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->hostId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShapeOutsideInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShapeOutsideInfo.php
index d61e400a..b23f8605 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShapeOutsideInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOM/ShapeOutsideInfo.php
@@ -58,7 +58,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->bounds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/EventListener.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/EventListener.php
index 98c871f7..955e129e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/EventListener.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/EventListener.php
@@ -121,7 +121,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersRequest.php
index af5c9f46..d765cf15 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersResponse.php
index 516901ab..a4354cb3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/GetEventListenersResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->listeners !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveDOMBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveDOMBreakpointRequest.php
index ca5257ed..2b9dc941 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveDOMBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveDOMBreakpointRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveEventListenerBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveEventListenerBreakpointRequest.php
index 1cf3fe61..b70c56b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveEventListenerBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveEventListenerBreakpointRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveInstrumentationBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveInstrumentationBreakpointRequest.php
index 0336a041..964f4955 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveInstrumentationBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveInstrumentationBreakpointRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveXHRBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveXHRBreakpointRequest.php
index e7d9d90c..fbf3fa9e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveXHRBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/RemoveXHRBreakpointRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetBreakOnCSPViolationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetBreakOnCSPViolationRequest.php
index 915dcda6..d01c0ec8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetBreakOnCSPViolationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetBreakOnCSPViolationRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->violationTypes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetDOMBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetDOMBreakpointRequest.php
index de6f5689..4c7d9ac4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetDOMBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetDOMBreakpointRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetEventListenerBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetEventListenerBreakpointRequest.php
index d091ec26..c8470039 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetEventListenerBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetEventListenerBreakpointRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetInstrumentationBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetInstrumentationBreakpointRequest.php
index d78a1deb..d09dcfc2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetInstrumentationBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetInstrumentationBreakpointRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetXHRBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetXHRBreakpointRequest.php
index 52f27788..4dc532ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetXHRBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMDebugger/SetXHRBreakpointRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotRequest.php
index 319aa16c..15a2b3f6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotRequest.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->computedStyles !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotResponse.php
index 78b8e8ff..9ca67967 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/CaptureSnapshotResponse.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->documents !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/ComputedStyle.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/ComputedStyle.php
index a78ed7cf..946162f5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/ComputedStyle.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/ComputedStyle.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->properties !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DOMNode.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DOMNode.php
index 16bf9a01..139e6979 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DOMNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DOMNode.php
@@ -309,7 +309,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DocumentSnapshot.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DocumentSnapshot.php
index 1f53a2f7..3b311f46 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DocumentSnapshot.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/DocumentSnapshot.php
@@ -169,7 +169,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->documentURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotRequest.php
index b28644cb..3eb22b58 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotRequest.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->computedStyleWhitelist !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotResponse.php
index bb4afdb8..5c8e1719 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/GetSnapshotResponse.php
@@ -58,7 +58,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->domNodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/InlineTextBox.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/InlineTextBox.php
index 4500b7ce..5f9918e9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/InlineTextBox.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/InlineTextBox.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->boundingBox !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeNode.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeNode.php
index 01c4ba64..c1a30f4e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeNode.php
@@ -94,7 +94,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->domNodeIndex !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeSnapshot.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeSnapshot.php
index 24b3cddf..bd5abe13 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeSnapshot.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/LayoutTreeSnapshot.php
@@ -200,7 +200,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIndex !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NameValue.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NameValue.php
index 7a9a1427..b8535bbb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NameValue.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NameValue.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NodeTreeSnapshot.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NodeTreeSnapshot.php
index 29e64def..2cc73232 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NodeTreeSnapshot.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/NodeTreeSnapshot.php
@@ -213,7 +213,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentIndex !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareBooleanData.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareBooleanData.php
index 15841c1a..59ae7c71 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareBooleanData.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareBooleanData.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->index !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareIntegerData.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareIntegerData.php
index e8613c99..193804d4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareIntegerData.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareIntegerData.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->index !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareStringData.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareStringData.php
index 25f4543c..5d50fe5b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareStringData.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/RareStringData.php
@@ -40,7 +40,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->index !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/TextBoxSnapshot.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/TextBoxSnapshot.php
index dbf87c16..f5ff06b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/TextBoxSnapshot.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMSnapshot/TextBoxSnapshot.php
@@ -78,7 +78,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layoutIndex !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/ClearRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/ClearRequest.php
index ad482c8c..db2729a3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/ClearRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/ClearRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemAddedEvent.php
index 11f111ac..22d7b0af 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemAddedEvent.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemRemovedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemRemovedEvent.php
index 2b76d0a3..4175df99 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemRemovedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemRemovedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemUpdatedEvent.php
index a8938e1f..865e6b39 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemUpdatedEvent.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemsClearedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemsClearedEvent.php
index a523fb17..d992d09a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemsClearedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/DomStorageItemsClearedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsRequest.php
index 9da32a51..bfe3ac5a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsResponse.php
index 68e6ebe8..3f4acfaa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/GetDOMStorageItemsResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->entries !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/RemoveDOMStorageItemRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/RemoveDOMStorageItemRequest.php
index a83c0e64..4b2fbc2f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/RemoveDOMStorageItemRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/RemoveDOMStorageItemRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/SetDOMStorageItemRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/SetDOMStorageItemRequest.php
index 1896292a..97285b72 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/SetDOMStorageItemRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/SetDOMStorageItemRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/StorageId.php b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/StorageId.php
index e21401ba..83cb1f6f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/StorageId.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DOMStorage/StorageId.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/AddDatabaseEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/AddDatabaseEvent.php
index 609159da..5d55b370 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/AddDatabaseEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/AddDatabaseEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->database !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/Database.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/Database.php
index 53b9b2e1..13c08d9b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/Database.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/Database.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/Error.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/Error.php
index 58309a29..f95f8053 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/Error.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/Error.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLRequest.php
index d295fa21..97ae29c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->databaseId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLResponse.php
index b25322c6..87667e5d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/ExecuteSQLResponse.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->columnNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesRequest.php
index 0ce6469b..6ef1485c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->databaseId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesResponse.php
index 10c6b976..e9707c85 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Database/GetDatabaseTableNamesResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->tableNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakLocation.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakLocation.php
index 56117888..8f727de1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakLocation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakLocation.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakpointResolvedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakpointResolvedEvent.php
index 78372640..a0fb752c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakpointResolvedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/BreakpointResolvedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/CallFrame.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/CallFrame.php
index d75a9b24..043d65c9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/CallFrame.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/CallFrame.php
@@ -104,7 +104,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ContinueToLocationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ContinueToLocationRequest.php
index 98407e6e..d95169dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ContinueToLocationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ContinueToLocationRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->location !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/DebugSymbols.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/DebugSymbols.php
index c7cb81a3..a49f27fa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/DebugSymbols.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/DebugSymbols.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableRequest.php
index 50a1ea35..8c35d218 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->maxScriptsCacheSize !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableResponse.php
index 1979d823..dbc3d747 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EnableResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->debuggerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameRequest.php
index 7a24fc14..71903d68 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameRequest.php
@@ -109,7 +109,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameResponse.php
index 03bcccd3..06d2714c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/EvaluateOnCallFrameResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsRequest.php
index 2986f6ff..c5b792c2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->start !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsResponse.php
index c1e3e8a1..9495569a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetPossibleBreakpointsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->locations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceRequest.php
index fe02efc9..14efb962 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceResponse.php
index 721feea8..b23d6682 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetScriptSourceResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptSource !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceRequest.php
index 710ff041..58a017e7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceRequest.php
@@ -27,7 +27,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->stackTraceId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceResponse.php
index e885bda0..1cb8cb36 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetStackTraceResponse.php
@@ -27,7 +27,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->stackTrace !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeRequest.php
index 9daadb84..dcafc231 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeResponse.php
index e2696c97..64cbe936 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/GetWasmBytecodeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->bytecode !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Location.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Location.php
index 7c9244c5..0f3b38e3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Location.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Location.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/LocationRange.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/LocationRange.php
index 21809702..cc5f7581 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/LocationRange.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/LocationRange.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PauseOnAsyncCallRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PauseOnAsyncCallRequest.php
index c26ded08..0ee580f6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PauseOnAsyncCallRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PauseOnAsyncCallRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentStackTraceId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PausedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PausedEvent.php
index 1f96e9a8..f7eada3c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PausedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/PausedEvent.php
@@ -98,7 +98,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RemoveBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RemoveBreakpointRequest.php
index 5d533952..4cac1ab1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RemoveBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RemoveBreakpointRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameRequest.php
index 851eeb78..d1eeff2f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameResponse.php
index 19b6e8dd..f110f785 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/RestartFrameResponse.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumeRequest.php
index f77ee589..cfd00761 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->terminateOnResume !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumedEvent.php
index abcdbd46..d958d4f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ResumedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Scope.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Scope.php
index a99709f2..87465a78 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Scope.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/Scope.php
@@ -67,7 +67,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptFailedToParseEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptFailedToParseEvent.php
index 8e627062..95faeaee 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptFailedToParseEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptFailedToParseEvent.php
@@ -191,7 +191,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptParsedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptParsedEvent.php
index 43031a57..c1e48d78 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptParsedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptParsedEvent.php
@@ -211,7 +211,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptPosition.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptPosition.php
index d9db7e4b..974dfe3b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptPosition.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/ScriptPosition.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->lineNumber !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentRequest.php
index 19668ff2..ecac11da 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentResponse.php
index 407be52d..7ad437b4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchInContentResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchMatch.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchMatch.php
index b472d36e..90977f76 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchMatch.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SearchMatch.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->lineNumber !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetAsyncCallStackDepthRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetAsyncCallStackDepthRequest.php
index 571652ae..5327ff83 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetAsyncCallStackDepthRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetAsyncCallStackDepthRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->maxDepth !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxPatternsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxPatternsRequest.php
index 0cd6dc00..5bd1cfd8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxPatternsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxPatternsRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->patterns !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxedRangesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxedRangesRequest.php
index 3a972f3e..20fd3a30 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxedRangesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBlackboxedRangesRequest.php
@@ -38,7 +38,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlRequest.php
index 4c0d9987..0115f1e2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlRequest.php
@@ -79,7 +79,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->lineNumber !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlResponse.php
index 3f25ec59..30054804 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointByUrlResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallRequest.php
index 615685ca..9a8a906d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallResponse.php
index 72d25159..dd79b59a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointOnFunctionCallResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointRequest.php
index 26413f15..f715aae0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->location !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointResponse.php
index ba391a3a..6bc6c84b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointsActiveRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointsActiveRequest.php
index 5189376b..7c9bb27a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointsActiveRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetBreakpointsActiveRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->active !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointRequest.php
index 628d23e0..642a8eea 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->instrumentation !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointResponse.php
index 7e9a6e20..b1d2d98e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetInstrumentationBreakpointResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakpointId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetPauseOnExceptionsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetPauseOnExceptionsRequest.php
index 509a652b..e44c9c6f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetPauseOnExceptionsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetPauseOnExceptionsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->state !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetReturnValueRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetReturnValueRequest.php
index d20fd736..c2391b4f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetReturnValueRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetReturnValueRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->newValue !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceRequest.php
index f8d78850..ab76bb60 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceResponse.php
index e2dff97b..e93c99cd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetScriptSourceResponse.php
@@ -76,7 +76,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetSkipAllPausesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetSkipAllPausesRequest.php
index e1ef631b..32cb5e0d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetSkipAllPausesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetSkipAllPausesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->skip !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetVariableValueRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetVariableValueRequest.php
index 44dee68d..12cd37d3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetVariableValueRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/SetVariableValueRequest.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scopeNumber !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepIntoRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepIntoRequest.php
index 45dfa235..5ed403dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepIntoRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepIntoRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->breakOnAsyncCall !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepOverRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepOverRequest.php
index 563f48d6..956d1f2d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepOverRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Debugger/StepOverRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->skipList !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/DeviceOrientation/SetDeviceOrientationOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/DeviceOrientation/SetDeviceOrientationOverrideRequest.php
index 59758a37..0e3b67dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/DeviceOrientation/SetDeviceOrientationOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/DeviceOrientation/SetDeviceOrientationOverrideRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->alpha !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/CanEmulateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/CanEmulateResponse.php
index 5e7f34ab..982a41d4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/CanEmulateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/CanEmulateResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/DisplayFeature.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/DisplayFeature.php
index b9d1f42c..e46b15de 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/DisplayFeature.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/DisplayFeature.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->orientation !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/MediaFeature.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/MediaFeature.php
index 967ad117..2da8a730 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/MediaFeature.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/MediaFeature.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/ScreenOrientation.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/ScreenOrientation.php
index 8c5791ca..bb05382a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/ScreenOrientation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/ScreenOrientation.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetAutoDarkModeOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetAutoDarkModeOverrideRequest.php
index aacd24d7..8bf42245 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetAutoDarkModeOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetAutoDarkModeOverrideRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetCPUThrottlingRateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetCPUThrottlingRateRequest.php
index 4455a2e1..90453452 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetCPUThrottlingRateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetCPUThrottlingRateRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rate !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDefaultBackgroundColorOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDefaultBackgroundColorOverrideRequest.php
index 08d9538f..d690e048 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDefaultBackgroundColorOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDefaultBackgroundColorOverrideRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->color !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDeviceMetricsOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDeviceMetricsOverrideRequest.php
index 7a1bbb1f..0226d5c7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDeviceMetricsOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDeviceMetricsOverrideRequest.php
@@ -151,7 +151,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->width !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDisabledImageTypesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDisabledImageTypesRequest.php
index 55171601..43c28eec 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDisabledImageTypesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDisabledImageTypesRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->imageTypes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDocumentCookieDisabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDocumentCookieDisabledRequest.php
index fe6389d6..bd030c3c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDocumentCookieDisabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetDocumentCookieDisabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->disabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmitTouchEventsForMouseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmitTouchEventsForMouseRequest.php
index 515c4043..318f68c7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmitTouchEventsForMouseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmitTouchEventsForMouseRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedMediaRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedMediaRequest.php
index 88cfed29..5ab1b12d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedMediaRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedMediaRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->media !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedVisionDeficiencyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedVisionDeficiencyRequest.php
index e8f392fd..46f7111a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedVisionDeficiencyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetEmulatedVisionDeficiencyRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetFocusEmulationEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetFocusEmulationEnabledRequest.php
index 92210260..8a593666 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetFocusEmulationEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetFocusEmulationEnabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetGeolocationOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetGeolocationOverrideRequest.php
index 51467a14..47a7974a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetGeolocationOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetGeolocationOverrideRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->latitude !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetIdleOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetIdleOverrideRequest.php
index 029ea9f0..5595c1d3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetIdleOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetIdleOverrideRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->isUserActive !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetLocaleOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetLocaleOverrideRequest.php
index 05d835be..6f5df304 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetLocaleOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetLocaleOverrideRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->locale !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetNavigatorOverridesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetNavigatorOverridesRequest.php
index 493dc36e..81fc866d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetNavigatorOverridesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetNavigatorOverridesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->platform !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetPageScaleFactorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetPageScaleFactorRequest.php
index de2b68db..9dbc05ef 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetPageScaleFactorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetPageScaleFactorRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->pageScaleFactor !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScriptExecutionDisabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScriptExecutionDisabledRequest.php
index 33816561..af61fe07 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScriptExecutionDisabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScriptExecutionDisabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScrollbarsHiddenRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScrollbarsHiddenRequest.php
index bc1e4548..99164056 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScrollbarsHiddenRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetScrollbarsHiddenRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->hidden !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTimezoneOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTimezoneOverrideRequest.php
index 356515d1..e8aeeabd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTimezoneOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTimezoneOverrideRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timezoneId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTouchEmulationEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTouchEmulationEnabledRequest.php
index 007fc65d..08a38dde 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTouchEmulationEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetTouchEmulationEnabledRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetUserAgentOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetUserAgentOverrideRequest.php
index bf8ac377..b16ed53f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetUserAgentOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetUserAgentOverrideRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->userAgent !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyRequest.php
index 4e73523f..611aa584 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyRequest.php
@@ -65,7 +65,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->policy !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyResponse.php
index f3858822..c54c9113 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVirtualTimePolicyResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->virtualTimeTicksBase !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVisibleSizeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVisibleSizeRequest.php
index d6747191..bf64758c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVisibleSizeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/SetVisibleSizeRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->width !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentBrandVersion.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentBrandVersion.php
index eac10e2f..b6048f09 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentBrandVersion.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentBrandVersion.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->brand !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentMetadata.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentMetadata.php
index 951f0bb0..c002efcc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentMetadata.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/UserAgentMetadata.php
@@ -64,7 +64,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->brands !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/VirtualTimeBudgetExpiredEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/VirtualTimeBudgetExpiredEvent.php
index 1f742ec9..93634845 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Emulation/VirtualTimeBudgetExpiredEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Emulation/VirtualTimeBudgetExpiredEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallenge.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallenge.php
index 822b5a52..077c1604 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallenge.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallenge.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->source !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallengeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallengeResponse.php
index 21b6a2c4..4562064a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallengeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthChallengeResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->response !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthRequiredEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthRequiredEvent.php
index 46aa883c..591a485e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthRequiredEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/AuthRequiredEvent.php
@@ -71,7 +71,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueRequestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueRequestRequest.php
index f3ca647f..a06ed0ee 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueRequestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueRequestRequest.php
@@ -82,7 +82,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueResponseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueResponseRequest.php
index 218949a8..7bcae34f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueResponseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueResponseRequest.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueWithAuthRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueWithAuthRequest.php
index fb01e073..4f1928c0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueWithAuthRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/ContinueWithAuthRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/EnableRequest.php
index 57991fca..c42c09d0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/EnableRequest.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->patterns !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FailRequestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FailRequestRequest.php
index e9946145..00dd2914 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FailRequestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FailRequestRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FulfillRequestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FulfillRequestRequest.php
index 207a3a81..4a0f76e2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FulfillRequestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/FulfillRequestRequest.php
@@ -82,7 +82,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyRequest.php
index 4b6574ea..1d0fe756 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyResponse.php
index aec4c7e1..a8a556d8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/GetResponseBodyResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->body !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/HeaderEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/HeaderEntry.php
index 1725ec98..7a00fc1b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/HeaderEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/HeaderEntry.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPattern.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPattern.php
index 49dbca18..3541a61b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPattern.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPattern.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->urlPattern !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPausedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPausedEvent.php
index 384313c0..27987921 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPausedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/RequestPausedEvent.php
@@ -114,7 +114,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamRequest.php
index 66e10a53..78c8482c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamResponse.php
index 21217d6e..404f52ff 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Fetch/TakeResponseBodyAsStreamResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->stream !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameRequest.php
index 4f8b1568..8815ae18 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameTimeTicks !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameResponse.php
index cc9e941e..e5b13de0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/BeginFrameResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->hasDamage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/NeedsBeginFramesChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/NeedsBeginFramesChangedEvent.php
index e34ce9a6..721cf581 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/NeedsBeginFramesChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/NeedsBeginFramesChangedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->needsBeginFrames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/ScreenshotParams.php b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/ScreenshotParams.php
index bdd290c8..b81ca6ad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/ScreenshotParams.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeadlessExperimental/ScreenshotParams.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->format !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddHeapSnapshotChunkEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddHeapSnapshotChunkEvent.php
index d872061a..42695ee9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddHeapSnapshotChunkEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddHeapSnapshotChunkEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->chunk !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddInspectedHeapObjectRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddInspectedHeapObjectRequest.php
index a9f61ba9..0d043c79 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddInspectedHeapObjectRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/AddInspectedHeapObjectRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->heapObjectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdRequest.php
index 8e3b3f09..10acf8fb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdResponse.php
index 2f8066cf..e92688c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetHeapObjectIdResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->heapSnapshotObjectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdRequest.php
index 7198453b..e58d79d5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdResponse.php
index 8fad86fa..506480a1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetObjectByHeapObjectIdResponse.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetSamplingProfileResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetSamplingProfileResponse.php
index 2734724b..9e953597 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetSamplingProfileResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/GetSamplingProfileResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/HeapStatsUpdateEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/HeapStatsUpdateEvent.php
index 14374a61..bc75815d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/HeapStatsUpdateEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/HeapStatsUpdateEvent.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->statsUpdate !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/LastSeenObjectIdEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/LastSeenObjectIdEvent.php
index 5f96416c..3a51a3e2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/LastSeenObjectIdEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/LastSeenObjectIdEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->lastSeenObjectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ReportHeapSnapshotProgressEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ReportHeapSnapshotProgressEvent.php
index 12c200ff..2356446f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ReportHeapSnapshotProgressEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ReportHeapSnapshotProgressEvent.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->done !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ResetProfilesEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ResetProfilesEvent.php
index af43ec03..1a2f05e8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ResetProfilesEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/ResetProfilesEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfile.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfile.php
index ab93acb3..3b84ddfe 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfile.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfile.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->head !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileNode.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileNode.php
index f17959b9..01babb40 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileNode.php
@@ -64,7 +64,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callFrame !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileSample.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileSample.php
index 7827bdfb..4965643a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileSample.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/SamplingHeapProfileSample.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->size !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartSamplingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartSamplingRequest.php
index 4f7b761b..7baad077 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartSamplingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartSamplingRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->samplingInterval !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartTrackingHeapObjectsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartTrackingHeapObjectsRequest.php
index 2c956125..7d10970b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartTrackingHeapObjectsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StartTrackingHeapObjectsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->trackAllocations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopSamplingResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopSamplingResponse.php
index d25422f9..dab35057 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopSamplingResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopSamplingResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopTrackingHeapObjectsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopTrackingHeapObjectsRequest.php
index 5416411c..35327ef4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopTrackingHeapObjectsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/StopTrackingHeapObjectsRequest.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->reportProgress !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/TakeHeapSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/TakeHeapSnapshotRequest.php
index 469c5f3e..0ebb7cc4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/TakeHeapSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/HeapProfiler/TakeHeapSnapshotRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->reportProgress !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IO/CloseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IO/CloseRequest.php
index 88da4b8c..ad8575b8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IO/CloseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IO/CloseRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->handle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadRequest.php
index ba25de99..7d200954 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->handle !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadResponse.php
index 393a2d38..2ff18bc7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IO/ReadResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->base64Encoded !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobRequest.php
index 0b5e208d..c1b3acdf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobResponse.php
index 7991ddc2..108d1049 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IO/ResolveBlobResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->uuid !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ClearObjectStoreRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ClearObjectStoreRequest.php
index 58401334..a6fef9f9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ClearObjectStoreRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ClearObjectStoreRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DataEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DataEntry.php
index 68dca17b..bb7b2a1f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DataEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DataEntry.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->key !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DatabaseWithObjectStores.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DatabaseWithObjectStores.php
index 4d1b8b9c..1d95195e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DatabaseWithObjectStores.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DatabaseWithObjectStores.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteDatabaseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteDatabaseRequest.php
index 713154da..2eccbc31 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteDatabaseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteDatabaseRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteObjectStoreEntriesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteObjectStoreEntriesRequest.php
index c5034c96..bd4c50ac 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteObjectStoreEntriesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/DeleteObjectStoreEntriesRequest.php
@@ -47,7 +47,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataRequest.php
index 9d3087b9..93f68de4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataResponse.php
index 0496ee1c..6c79e652 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/GetMetadataResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->entriesCount !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/Key.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/Key.php
index 38efd514..a3aa3ea8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/Key.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/Key.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyPath.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyPath.php
index fe4f35ba..f4c2ea54 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyPath.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyPath.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyRange.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyRange.php
index 68fb6e76..70b96de1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyRange.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/KeyRange.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->lower !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStore.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStore.php
index 634965d7..d407dc06 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStore.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStore.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStoreIndex.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStoreIndex.php
index 5a9943f7..6d0271a2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStoreIndex.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/ObjectStoreIndex.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataRequest.php
index b9d75a62..3ce332d6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataRequest.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataResponse.php
index 21e4fae8..b9955372 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDataResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectStoreDataEntries !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesRequest.php
index e431e820..be5c93f8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesResponse.php
index 9eb41100..8b5bd4c0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseNamesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->databaseNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseRequest.php
index 31fa48b8..47cfc046 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseResponse.php
index c4d9340f..1109ca55 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/IndexedDB/RequestDatabaseResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->databaseWithObjectStores !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchDragEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchDragEventRequest.php
index 898bfa43..672aca28 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchDragEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchDragEventRequest.php
@@ -65,7 +65,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchKeyEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchKeyEventRequest.php
index 8d02bee9..4131e0d3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchKeyEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchKeyEventRequest.php
@@ -172,7 +172,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchMouseEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchMouseEventRequest.php
index 4a7e1070..01fb96a5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchMouseEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchMouseEventRequest.php
@@ -179,7 +179,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchTouchEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchTouchEventRequest.php
index c05c4ff4..ee3733df 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchTouchEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DispatchTouchEventRequest.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragData.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragData.php
index 219477d4..c954c8c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragData.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragData.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->items !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragDataItem.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragDataItem.php
index 07102580..9e366b42 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragDataItem.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragDataItem.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->mimeType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragInterceptedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragInterceptedEvent.php
index 4ca362d6..9516698b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/DragInterceptedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/DragInterceptedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->data !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/EmulateTouchFromMouseEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/EmulateTouchFromMouseEventRequest.php
index 9bd3f698..69f61021 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/EmulateTouchFromMouseEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/EmulateTouchFromMouseEventRequest.php
@@ -109,7 +109,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/ImeSetCompositionRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/ImeSetCompositionRequest.php
index 2fb0a8ca..bc3fc2b1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/ImeSetCompositionRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/ImeSetCompositionRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/InsertTextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/InsertTextRequest.php
index 4a75f1a6..d43fcb28 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/InsertTextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/InsertTextRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->text !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/SetIgnoreInputEventsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/SetIgnoreInputEventsRequest.php
index 844dc4ee..4187426b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/SetIgnoreInputEventsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/SetIgnoreInputEventsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->ignore !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/SetInterceptDragsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/SetInterceptDragsRequest.php
index ae230c9f..a4b74f09 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/SetInterceptDragsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/SetInterceptDragsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizePinchGestureRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizePinchGestureRequest.php
index 2995a1d6..21e0783b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizePinchGestureRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizePinchGestureRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeScrollGestureRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeScrollGestureRequest.php
index 6f245d9d..07f63786 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeScrollGestureRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeScrollGestureRequest.php
@@ -139,7 +139,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeTapGestureRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeTapGestureRequest.php
index b462390a..d334a0b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeTapGestureRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/SynthesizeTapGestureRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Input/TouchPoint.php b/gen-src/ChromeDevtoolsProtocol/Model/Input/TouchPoint.php
index 0990daeb..b437bda7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Input/TouchPoint.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Input/TouchPoint.php
@@ -129,7 +129,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/DetachedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/DetachedEvent.php
index e2d295e7..27d791fa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/DetachedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/DetachedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->reason !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetCrashedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetCrashedEvent.php
index 35d0386b..08a61a8b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetCrashedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetCrashedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetReloadedAfterCrashEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetReloadedAfterCrashEvent.php
index 6d77edc8..b5fb8a85 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetReloadedAfterCrashEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Inspector/TargetReloadedAfterCrashEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsRequest.php
index 384d6bcb..de8641aa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsResponse.php
index 385f8d2c..5d3a2306 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/CompositingReasonsResponse.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->compositingReasons !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/Layer.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/Layer.php
index f6972b3b..48ff49b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/Layer.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/Layer.php
@@ -185,7 +185,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerPaintedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerPaintedEvent.php
index be24a677..c69661cf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerPaintedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerPaintedEvent.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerTreeDidChangeEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerTreeDidChangeEvent.php
index a15567b7..96fbb50e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerTreeDidChangeEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LayerTreeDidChangeEvent.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layers !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotRequest.php
index 13918d7d..3ed28f32 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->tiles !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotResponse.php
index 222754cd..afc96550 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/LoadSnapshotResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotRequest.php
index dc5f4d67..61ff68fb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotResponse.php
index 0111490b..539a7192 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/MakeSnapshotResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/PictureTile.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/PictureTile.php
index 0b0003e5..fa149d04 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/PictureTile.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/PictureTile.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotRequest.php
index 1231fbd6..83a67a3c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotRequest.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotResponse.php
index a8ec4d64..ef4cde6d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ProfileSnapshotResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timings !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReleaseSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReleaseSnapshotRequest.php
index e2b2b54a..9b75952c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReleaseSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReleaseSnapshotRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotRequest.php
index dd18c3cb..87cc3c62 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotResponse.php
index f06d7e6c..1ef92a4b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ReplaySnapshotResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->dataURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ScrollRect.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ScrollRect.php
index c38c5de3..0d40cbb5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ScrollRect.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/ScrollRect.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rect !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogRequest.php
index ad777561..a10377c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapshotId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogResponse.php
index 79fcdd4a..67a71ad0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/SnapshotCommandLogResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->commandLog !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/StickyPositionConstraint.php b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/StickyPositionConstraint.php
index ab5c7669..d0236982 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/StickyPositionConstraint.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/LayerTree/StickyPositionConstraint.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->stickyBoxRect !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Log/EntryAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Log/EntryAddedEvent.php
index 27d045d2..2700f588 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Log/EntryAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Log/EntryAddedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->entry !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Log/LogEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/Log/LogEntry.php
index 511da3e1..d5ac38e5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Log/LogEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Log/LogEntry.php
@@ -131,7 +131,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->source !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Log/StartViolationsReportRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Log/StartViolationsReportRequest.php
index 54bf5108..a4be4ae1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Log/StartViolationsReportRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Log/StartViolationsReportRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->config !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Log/ViolationSetting.php b/gen-src/ChromeDevtoolsProtocol/Model/Log/ViolationSetting.php
index 029318b8..7de3a841 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Log/ViolationSetting.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Log/ViolationSetting.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerError.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerError.php
index 33147537..dcf9eff6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerError.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerError.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerErrorsRaisedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerErrorsRaisedEvent.php
index 10bb78f5..e4eacf59 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerErrorsRaisedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerErrorsRaisedEvent.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEvent.php
index 14123f3d..a4b7f19c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEventsAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEventsAddedEvent.php
index 42524e11..441c5f26 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEventsAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerEventsAddedEvent.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessage.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessage.php
index 57b1012b..404459ec 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessage.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->level !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessagesLoggedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessagesLoggedEvent.php
index 97f58783..c05f0fd6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessagesLoggedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerMessagesLoggedEvent.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerPropertiesChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerPropertiesChangedEvent.php
index 761851de..0203e165 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerPropertiesChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerPropertiesChangedEvent.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->playerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerProperty.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerProperty.php
index 1ff084a9..998e6579 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerProperty.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayerProperty.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayersCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayersCreatedEvent.php
index 369dac4a..07978a70 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayersCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Media/PlayersCreatedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->players !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetAllTimeSamplingProfileResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetAllTimeSamplingProfileResponse.php
index 7537b545..16925c83 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetAllTimeSamplingProfileResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetAllTimeSamplingProfileResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetBrowserSamplingProfileResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetBrowserSamplingProfileResponse.php
index 92b7d2ff..5f83fad3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetBrowserSamplingProfileResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetBrowserSamplingProfileResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetDOMCountersResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetDOMCountersResponse.php
index 78befbb8..df47d245 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetDOMCountersResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetDOMCountersResponse.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->documents !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetSamplingProfileResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetSamplingProfileResponse.php
index ae61d380..9c2b103f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetSamplingProfileResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/GetSamplingProfileResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/Module.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/Module.php
index dc328178..3dbaad0c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/Module.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/Module.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfile.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfile.php
index 3a0f701c..fe83a936 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfile.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfile.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->samples !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfileNode.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfileNode.php
index 4949faaa..dd97dee6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfileNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SamplingProfileNode.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->size !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SetPressureNotificationsSuppressedRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SetPressureNotificationsSuppressedRequest.php
index 9b3812ac..db665cb2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SetPressureNotificationsSuppressedRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SetPressureNotificationsSuppressedRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->suppressed !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SimulatePressureNotificationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SimulatePressureNotificationRequest.php
index b21b22a4..0a3e6cb0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/SimulatePressureNotificationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/SimulatePressureNotificationRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->level !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Memory/StartSamplingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Memory/StartSamplingRequest.php
index 89111501..6e8c4d4b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Memory/StartSamplingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Memory/StartSamplingRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->samplingInterval !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallenge.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallenge.php
index d649c2ef..c48d7287 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallenge.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallenge.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->source !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallengeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallengeResponse.php
index fee359a7..1d1aab25 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallengeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/AuthChallengeResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->response !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedCookieWithReason.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedCookieWithReason.php
index 01c926d1..8fa77d24 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedCookieWithReason.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedCookieWithReason.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->blockedReasons !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedSetCookieWithReason.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedSetCookieWithReason.php
index 5672dc77..5a39a6e4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedSetCookieWithReason.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/BlockedSetCookieWithReason.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->blockedReasons !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CachedResource.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CachedResource.php
index af5e3996..45a27a3c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CachedResource.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CachedResource.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCacheResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCacheResponse.php
index f074a2c0..558d2185 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCacheResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCacheResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCookiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCookiesResponse.php
index fd0b81c8..db52adc2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCookiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanClearBrowserCookiesResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanEmulateNetworkConditionsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanEmulateNetworkConditionsResponse.php
index d85715a1..93a997ce 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CanEmulateNetworkConditionsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CanEmulateNetworkConditionsResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ClientSecurityState.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ClientSecurityState.php
index aa7fcd1d..61248866 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ClientSecurityState.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ClientSecurityState.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->initiatorIsSecureContext !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ConnectTiming.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ConnectTiming.php
index f6200ba6..0549407c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ConnectTiming.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ConnectTiming.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestTime !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ContinueInterceptedRequestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ContinueInterceptedRequestRequest.php
index 20fe1a2d..3d8df587 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ContinueInterceptedRequestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ContinueInterceptedRequestRequest.php
@@ -95,7 +95,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->interceptionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/Cookie.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/Cookie.php
index 20d27e94..f8bf8ef5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/Cookie.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/Cookie.php
@@ -159,7 +159,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CookieParam.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CookieParam.php
index ff8f8a48..2a416f7b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CookieParam.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CookieParam.php
@@ -149,7 +149,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CorsErrorStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CorsErrorStatus.php
index ff766106..49d2f7ca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CorsErrorStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CorsErrorStatus.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->corsError !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginEmbedderPolicyStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginEmbedderPolicyStatus.php
index ca59660c..3335f368 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginEmbedderPolicyStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginEmbedderPolicyStatus.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginOpenerPolicyStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginOpenerPolicyStatus.php
index e349a544..57fd36a3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginOpenerPolicyStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/CrossOriginOpenerPolicyStatus.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/DataReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/DataReceivedEvent.php
index 6c8b154c..a6fa213b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/DataReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/DataReceivedEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/DeleteCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/DeleteCookiesRequest.php
index b4e60f9e..ed08d23f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/DeleteCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/DeleteCookiesRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/EmulateNetworkConditionsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/EmulateNetworkConditionsRequest.php
index 1f54c457..2608cfbc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/EmulateNetworkConditionsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/EmulateNetworkConditionsRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->offline !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableReportingApiRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableReportingApiRequest.php
index 07bf4b2e..223f292c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableReportingApiRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableReportingApiRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enable !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableRequest.php
index 4d9dd69d..73fbf784 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/EnableRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->maxTotalBufferSize !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/EventSourceMessageReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/EventSourceMessageReceivedEvent.php
index f3d092e0..d0d5d6ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/EventSourceMessageReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/EventSourceMessageReceivedEvent.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetAllCookiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetAllCookiesResponse.php
index 87c4cde3..5d001088 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetAllCookiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetAllCookiesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateRequest.php
index 7aecf00e..07b3e033 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateResponse.php
index 22e16e0a..d32c861d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCertificateResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->tableNames !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesRequest.php
index 57e630a4..9cbaefa9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->urls !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesResponse.php
index 4d11edb8..cc0dd7c3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetCookiesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataRequest.php
index 4358847a..75fa71d6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataResponse.php
index b7c3b6b6..e3cc1b75 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetRequestPostDataResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->postData !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionRequest.php
index 616b85d2..c90fe6be 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->interceptionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionResponse.php
index 0c08705e..50c886ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyForInterceptionResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->body !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyRequest.php
index 3fcf2827..ccdf35a3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyResponse.php
index d37ccde6..a4e9f56e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetResponseBodyResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->body !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusRequest.php
index e3a4eb5e..ca2344f5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusResponse.php
index 773872ef..b492850a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/GetSecurityIsolationStatusResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->status !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/Headers.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/Headers.php
index 6e3686ee..75b6c7d8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/Headers.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/Headers.php
@@ -37,7 +37,7 @@ public static function fromJson($rawData)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		return $this->rawData;
 	}
@@ -72,7 +72,7 @@ public function all(): array
 	}
 
 
-	public function getIterator()
+	public function getIterator(): ArrayIterator
 	{
 		return new ArrayIterator($this->headers);
 	}
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/Initiator.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/Initiator.php
index bc64795b..4bce5c74 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/Initiator.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/Initiator.php
@@ -81,7 +81,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceOptions.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceOptions.php
index c456697a..cf5ce33f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceOptions.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceOptions.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->disableCache !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourcePageResult.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourcePageResult.php
index ac26454a..f5b369a6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourcePageResult.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourcePageResult.php
@@ -67,7 +67,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->success !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceRequest.php
index 2eeb56df..43c58294 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceResponse.php
index c9877807..a9326687 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadNetworkResourceResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->resource !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFailedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFailedEvent.php
index f3250d4f..cb87d945 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFailedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFailedEvent.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFinishedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFinishedEvent.php
index 39f4f146..a72ea597 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFinishedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/LoadingFinishedEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/PostDataEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/PostDataEntry.php
index 888d6bcb..464d2b67 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/PostDataEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/PostDataEntry.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->bytes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReplayXHRRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReplayXHRRequest.php
index 416835b7..201f9c5e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReplayXHRRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReplayXHRRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReport.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReport.php
index 2b11b0ac..76c4d6f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReport.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReport.php
@@ -97,7 +97,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportAddedEvent.php
index c1697d2f..3d91dd5d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportAddedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->report !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportUpdatedEvent.php
index a1c62e65..2c5134d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ReportingApiReportUpdatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->report !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/Request.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/Request.php
index 6db204d7..3a955e70 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/Request.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/Request.php
@@ -152,7 +152,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestInterceptedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestInterceptedEvent.php
index 5bbcf187..451a2650 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestInterceptedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestInterceptedEvent.php
@@ -135,7 +135,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->interceptionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestPattern.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestPattern.php
index b4c53ad4..8bb2d23a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestPattern.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestPattern.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->urlPattern !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestServedFromCacheEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestServedFromCacheEvent.php
index a18926df..0d8125d8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestServedFromCacheEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestServedFromCacheEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentEvent.php
index a87ca250..f825eae5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentEvent.php
@@ -129,7 +129,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentExtraInfoEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentExtraInfoEvent.php
index 74ca777d..1a6be8c5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentExtraInfoEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/RequestWillBeSentExtraInfoEvent.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceChangedPriorityEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceChangedPriorityEvent.php
index f2b17105..ab5c442e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceChangedPriorityEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceChangedPriorityEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceTiming.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceTiming.php
index 2d9b3315..f28855e4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceTiming.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResourceTiming.php
@@ -199,7 +199,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestTime !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/Response.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/Response.php
index c2d7794d..3980e7b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/Response.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/Response.php
@@ -249,7 +249,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedEvent.php
index 4d537d35..bb01e25d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedEvent.php
@@ -79,7 +79,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedExtraInfoEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedExtraInfoEvent.php
index 4d6b2a76..f7859b12 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedExtraInfoEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/ResponseReceivedExtraInfoEvent.php
@@ -82,7 +82,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyRequest.php
index 5e100a22..2fecd926 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyResponse.php
index a25da6d6..a54990c7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SearchInResponseBodyResponse.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityDetails.php
index 022a2860..9501ab35 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityDetails.php
@@ -155,7 +155,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->protocol !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityIsolationStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityIsolationStatus.php
index faca9886..070c1609 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityIsolationStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SecurityIsolationStatus.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->coop !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAcceptedEncodingsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAcceptedEncodingsRequest.php
index 96d32116..cf77d07b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAcceptedEncodingsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAcceptedEncodingsRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->encodings !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAttachDebugStackRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAttachDebugStackRequest.php
index 3314b508..b557938f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAttachDebugStackRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetAttachDebugStackRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBlockedURLsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBlockedURLsRequest.php
index c278a834..894db1aa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBlockedURLsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBlockedURLsRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->urls !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBypassServiceWorkerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBypassServiceWorkerRequest.php
index 43b4356a..4a4330fb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBypassServiceWorkerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetBypassServiceWorkerRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->bypass !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCacheDisabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCacheDisabledRequest.php
index 245f00ad..5991bbe0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCacheDisabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCacheDisabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cacheDisabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieRequest.php
index 1a60cf43..32faceb6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieRequest.php
@@ -149,7 +149,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieResponse.php
index ca969287..39eafa7f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookieResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->success !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookiesRequest.php
index 68a797d0..3a007a12 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetCookiesRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetExtraHTTPHeadersRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetExtraHTTPHeadersRequest.php
index a41951b9..c2cd9d7b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetExtraHTTPHeadersRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetExtraHTTPHeadersRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->headers !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetRequestInterceptionRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetRequestInterceptionRequest.php
index d78f45d2..5b246c04 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetRequestInterceptionRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetRequestInterceptionRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->patterns !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetUserAgentOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetUserAgentOverrideRequest.php
index 5af36c06..b39b40e3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SetUserAgentOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SetUserAgentOverrideRequest.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->userAgent !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedCertificateTimestamp.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedCertificateTimestamp.php
index f91528c0..300c7cd5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedCertificateTimestamp.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedCertificateTimestamp.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->status !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeError.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeError.php
index 143b7b1d..86d5401d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeError.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeError.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeHeader.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeHeader.php
index cd514be2..47eaa53e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeHeader.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeHeader.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestUrl !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeInfo.php
index ef4f29f2..a38c4cea 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeInfo.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->outerResponse !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeReceivedEvent.php
index e6bb8ede..afb3fdfa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeReceivedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeSignature.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeSignature.php
index f74a23da..861c8ea0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeSignature.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SignedExchangeSignature.php
@@ -112,7 +112,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->label !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseErrorEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseErrorEvent.php
index 012817dc..73f8d032 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseErrorEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseErrorEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->innerRequestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseParsedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseParsedEvent.php
index 0715ab0b..7831ca57 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseParsedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleInnerResponseParsedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->innerRequestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataErrorEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataErrorEvent.php
index 2c6fd4b7..4b12f416 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataErrorEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataErrorEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataReceivedEvent.php
index 466d4771..42a0f67a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/SubresourceWebBundleMetadataReceivedEvent.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamRequest.php
index 9bcfc124..9e7726b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->interceptionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamResponse.php
index 5015f65f..320c1aad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/TakeResponseBodyForInterceptionAsStreamResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->stream !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenOperationDoneEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenOperationDoneEvent.php
index 84ffd34a..00e82763 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenOperationDoneEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenOperationDoneEvent.php
@@ -71,7 +71,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->status !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenParams.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenParams.php
index 7dbf91f6..3579ee0f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenParams.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/TrustTokenParams.php
@@ -48,7 +48,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketClosedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketClosedEvent.php
index 9422e6ab..9dba4222 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketClosedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketClosedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketCreatedEvent.php
index 468d216b..2623a3e6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketCreatedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrame.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrame.php
index 0cde7eb8..b6c3c214 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrame.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrame.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->opcode !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameErrorEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameErrorEvent.php
index 8acd20fb..98c50bad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameErrorEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameErrorEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameReceivedEvent.php
index 4ea8dbba..fba410ca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameReceivedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameSentEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameSentEvent.php
index 03e1c8a4..8b6cf2e1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameSentEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketFrameSentEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketHandshakeResponseReceivedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketHandshakeResponseReceivedEvent.php
index fce04044..86036687 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketHandshakeResponseReceivedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketHandshakeResponseReceivedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketRequest.php
index 05215961..1e8687ce 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->headers !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketResponse.php
index b2e9ace4..486f2955 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketResponse.php
@@ -79,7 +79,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->status !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketWillSendHandshakeRequestEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketWillSendHandshakeRequestEvent.php
index 820211f3..7799be8c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketWillSendHandshakeRequestEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebSocketWillSendHandshakeRequestEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->requestId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportClosedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportClosedEvent.php
index 000189e7..d3ee59e5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportClosedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportClosedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->transportId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportConnectionEstablishedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportConnectionEstablishedEvent.php
index 6a772b6b..70d5c0ef 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportConnectionEstablishedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportConnectionEstablishedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->transportId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportCreatedEvent.php
index ced327ec..64a3f3aa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Network/WebTransportCreatedEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->transportId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/BoxStyle.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/BoxStyle.php
index 34cc4403..ba2b86a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/BoxStyle.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/BoxStyle.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->fillColor !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryContainerHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryContainerHighlightConfig.php
index 69d8bc1d..40f16911 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryContainerHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryContainerHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->containerBorder !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryHighlightConfig.php
index 27fc5380..38e897a3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ContainerQueryHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->containerQueryContainerHighlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexContainerHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexContainerHighlightConfig.php
index 8f94fda3..7615f7a4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexContainerHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexContainerHighlightConfig.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->containerBorder !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexItemHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexItemHighlightConfig.php
index d6295bf4..365586e5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexItemHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexItemHighlightConfig.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->baseSizeBox !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexNodeHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexNodeHighlightConfig.php
index a6969059..8a34ad8c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexNodeHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/FlexNodeHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->flexContainerHighlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestRequest.php
index d185bade..c6357103 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestResponse.php
index 23319743..76d6e748 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetGridHighlightObjectsForTestResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->highlights !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestRequest.php
index 35d1a558..6db76e3e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestResponse.php
index c2a49e02..798e6423 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetHighlightObjectForTestResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->highlight !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestRequest.php
index ee27280e..0572112b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestResponse.php
index a4753142..64bdd38d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GetSourceOrderHighlightObjectForTestResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->highlight !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridHighlightConfig.php
index 84ac1257..58ea7d3b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridHighlightConfig.php
@@ -221,7 +221,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->showGridExtensionLines !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridNodeHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridNodeHighlightConfig.php
index 48ffe824..b13b2f46 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridNodeHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/GridNodeHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->gridHighlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightConfig.php
index efa89b5f..54b8cdf4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightConfig.php
@@ -211,7 +211,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->showInfo !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightFrameRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightFrameRequest.php
index 6cefd6d4..d7938765 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightFrameRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightFrameRequest.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightNodeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightNodeRequest.php
index 8333344b..ee90f6b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightNodeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightNodeRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->highlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightQuadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightQuadRequest.php
index 80959a52..bb57c393 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightQuadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightQuadRequest.php
@@ -54,7 +54,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->quad !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightRectRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightRectRequest.php
index a733a171..7a748815 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightRectRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightRectRequest.php
@@ -81,7 +81,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightSourceOrderRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightSourceOrderRequest.php
index 6fea8628..ebeaa8be 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightSourceOrderRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HighlightSourceOrderRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sourceOrderConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HingeConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HingeConfig.php
index 5364e2db..72628fdc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HingeConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/HingeConfig.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rect !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectModeCanceledEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectModeCanceledEvent.php
index 3aa0b4cd..43515860 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectModeCanceledEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectModeCanceledEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectNodeRequestedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectNodeRequestedEvent.php
index d7b08d89..63c5e3d8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectNodeRequestedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/InspectNodeRequestedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->backendNodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolatedElementHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolatedElementHighlightConfig.php
index 56bb719a..3f89e882 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolatedElementHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolatedElementHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->isolationModeHighlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolationModeHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolationModeHighlightConfig.php
index 39b1e2d5..31003f94 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolationModeHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/IsolationModeHighlightConfig.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->resizerColor !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/LineStyle.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/LineStyle.php
index 9cbc901a..9a54942f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/LineStyle.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/LineStyle.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->color !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/NodeHighlightRequestedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/NodeHighlightRequestedEvent.php
index c69f229b..ed1a60a9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/NodeHighlightRequestedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/NodeHighlightRequestedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScreenshotRequestedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScreenshotRequestedEvent.php
index 76713bc0..05d2caad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScreenshotRequestedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScreenshotRequestedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->viewport !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapContainerHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapContainerHighlightConfig.php
index 57870473..aa5522ea 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapContainerHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapContainerHighlightConfig.php
@@ -61,7 +61,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->snapportBorder !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapHighlightConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapHighlightConfig.php
index 00c64268..f8625688 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapHighlightConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/ScrollSnapHighlightConfig.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scrollSnapContainerHighlightConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetInspectModeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetInspectModeRequest.php
index e1745c9d..c29caf01 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetInspectModeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetInspectModeRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->mode !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetPausedInDebuggerMessageRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetPausedInDebuggerMessageRequest.php
index 4aa6e2d9..cbcd3b43 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetPausedInDebuggerMessageRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetPausedInDebuggerMessageRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowAdHighlightsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowAdHighlightsRequest.php
index 110523e4..997d18f6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowAdHighlightsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowAdHighlightsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowContainerQueryOverlaysRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowContainerQueryOverlaysRequest.php
index 6c81c02e..19d258fc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowContainerQueryOverlaysRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowContainerQueryOverlaysRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->containerQueryHighlightConfigs !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowDebugBordersRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowDebugBordersRequest.php
index 922cfde4..a092a077 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowDebugBordersRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowDebugBordersRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFPSCounterRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFPSCounterRequest.php
index caea1c36..fdf186a2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFPSCounterRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFPSCounterRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFlexOverlaysRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFlexOverlaysRequest.php
index 13354d9b..fb58c7d8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFlexOverlaysRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowFlexOverlaysRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->flexNodeHighlightConfigs !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowGridOverlaysRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowGridOverlaysRequest.php
index e17c8d79..3ab14ff1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowGridOverlaysRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowGridOverlaysRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->gridNodeHighlightConfigs !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHingeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHingeRequest.php
index d9528ac5..5e1415a2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHingeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHingeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->hingeConfig !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHitTestBordersRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHitTestBordersRequest.php
index cbea40a9..283e571e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHitTestBordersRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowHitTestBordersRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowIsolatedElementsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowIsolatedElementsRequest.php
index 6fc5bf31..0823994a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowIsolatedElementsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowIsolatedElementsRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->isolatedElementHighlightConfigs !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowLayoutShiftRegionsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowLayoutShiftRegionsRequest.php
index c47dbc74..66334916 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowLayoutShiftRegionsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowLayoutShiftRegionsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowPaintRectsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowPaintRectsRequest.php
index 79a39a1a..0c8ce824 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowPaintRectsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowPaintRectsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollBottleneckRectsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollBottleneckRectsRequest.php
index 0da942ec..888d4ead 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollBottleneckRectsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollBottleneckRectsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollSnapOverlaysRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollSnapOverlaysRequest.php
index 15f74a4c..6138dad4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollSnapOverlaysRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowScrollSnapOverlaysRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scrollSnapHighlightConfigs !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowViewportSizeOnResizeRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowViewportSizeOnResizeRequest.php
index 790c89b7..b3836098 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowViewportSizeOnResizeRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowViewportSizeOnResizeRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowWebVitalsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowWebVitalsRequest.php
index b97ff8e2..8eea2f48 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowWebVitalsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SetShowWebVitalsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->show !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SourceOrderConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SourceOrderConfig.php
index 2c152d70..4f0d4d99 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SourceOrderConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Overlay/SourceOrderConfig.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->parentOutlineColor !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AdFrameStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AdFrameStatus.php
index 7df4749c..122a3bad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AdFrameStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AdFrameStatus.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->adFrameType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddCompilationCacheRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddCompilationCacheRequest.php
index e3ec34c6..ce92f768 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddCompilationCacheRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddCompilationCacheRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadRequest.php
index bb090313..2d7f3c67 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptSource !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadResponse.php
index 092431ce..51878d0a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnLoadResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->identifier !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentRequest.php
index f9cc1c6d..fa91fa7a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentRequest.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->source !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentResponse.php
index 43a00bba..41d4df9a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AddScriptToEvaluateOnNewDocumentResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->identifier !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestError.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestError.php
index 1d264e79..5855d4c6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestError.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestError.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestParsedProperties.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestParsedProperties.php
index 9ec678fe..46df45ca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestParsedProperties.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/AppManifestParsedProperties.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scope !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotRestoredExplanation.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotRestoredExplanation.php
index ea9df7ba..89c86ea2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotRestoredExplanation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotRestoredExplanation.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotUsedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotUsedEvent.php
index 6eb91602..8b8f9ca5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotUsedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/BackForwardCacheNotUsedEvent.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->loaderId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotRequest.php
index b1b6760c..c88281f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->format !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotResponse.php
index 1c5ca3c9..dada89f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureScreenshotResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->data !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotRequest.php
index 0cb4c8ba..081b4016 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->format !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotResponse.php
index c4abb704..e57b47fc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CaptureSnapshotResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->data !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheParams.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheParams.php
index d6a4535e..799cca69 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheParams.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheParams.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheProducedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheProducedEvent.php
index 27bf7cc7..3ac95f77 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheProducedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CompilationCacheProducedEvent.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldRequest.php
index 3c5ed599..f4d22d66 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldResponse.php
index 8aaf528d..00d6c356 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/CreateIsolatedWorldResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->executionContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/DeleteCookieRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/DeleteCookieRequest.php
index 799d634e..1b8cf848 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/DeleteCookieRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/DeleteCookieRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookieName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/DocumentOpenedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/DocumentOpenedEvent.php
index 527fc538..0db31fc9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/DocumentOpenedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/DocumentOpenedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frame !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/DomContentEventFiredEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/DomContentEventFiredEvent.php
index d8d62637..f61cdff6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/DomContentEventFiredEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/DomContentEventFiredEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadProgressEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadProgressEvent.php
index 49c89658..ec4babf7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadProgressEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadProgressEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->guid !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadWillBeginEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadWillBeginEvent.php
index 4ebf525e..da77646c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadWillBeginEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/DownloadWillBeginEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FileChooserOpenedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FileChooserOpenedEvent.php
index f4f623d7..17a28454 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FileChooserOpenedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FileChooserOpenedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FontFamilies.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FontFamilies.php
index af1d9c7e..a0cb17a9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FontFamilies.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FontFamilies.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->standard !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FontSizes.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FontSizes.php
index 048eac75..f136ff43 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FontSizes.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FontSizes.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->standard !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/Frame.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/Frame.php
index 055c3d1c..b74d8d7f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/Frame.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/Frame.php
@@ -165,7 +165,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameAttachedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameAttachedEvent.php
index 4d90a3ab..3c45228e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameAttachedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameAttachedEvent.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameClearedScheduledNavigationEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameClearedScheduledNavigationEvent.php
index abcfe884..00430dfb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameClearedScheduledNavigationEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameClearedScheduledNavigationEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameDetachedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameDetachedEvent.php
index 66c236b8..6a736d65 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameDetachedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameDetachedEvent.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameNavigatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameNavigatedEvent.php
index 9f68cf54..0f93b6e5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameNavigatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameNavigatedEvent.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frame !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameRequestedNavigationEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameRequestedNavigationEvent.php
index 444dfafa..31252e66 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameRequestedNavigationEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameRequestedNavigationEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResizedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResizedEvent.php
index c77408d0..2f2a452c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResizedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResizedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResource.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResource.php
index 6c7622f9..97eb5883 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResource.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResource.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResourceTree.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResourceTree.php
index 15403dbf..f5ed1ad3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResourceTree.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameResourceTree.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frame !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameScheduledNavigationEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameScheduledNavigationEvent.php
index 70083a34..fb2b18a6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameScheduledNavigationEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameScheduledNavigationEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStartedLoadingEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStartedLoadingEvent.php
index 3918cf27..a24a1885 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStartedLoadingEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStartedLoadingEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStoppedLoadingEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStoppedLoadingEvent.php
index 37f1f4ee..25d7824b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStoppedLoadingEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameStoppedLoadingEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameTree.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameTree.php
index 05e97de8..6e37d735 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameTree.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/FrameTree.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frame !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GenerateTestReportRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GenerateTestReportRequest.php
index 40ac5717..2a4470e3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GenerateTestReportRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GenerateTestReportRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppIdResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppIdResponse.php
index 8836dfbe..60c9fd7c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppIdResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppIdResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->appId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppManifestResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppManifestResponse.php
index 172706f6..3033861c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppManifestResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetAppManifestResponse.php
@@ -58,7 +58,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetCookiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetCookiesResponse.php
index 05108db2..fb324efb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetCookiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetCookiesResponse.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetFrameTreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetFrameTreeResponse.php
index c1bf09d6..7c9c4aaa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetFrameTreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetFrameTreeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameTree !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetInstallabilityErrorsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetInstallabilityErrorsResponse.php
index 92ad733d..c869d6b8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetInstallabilityErrorsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetInstallabilityErrorsResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->installabilityErrors !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetLayoutMetricsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetLayoutMetricsResponse.php
index bb2f211a..50d3b05e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetLayoutMetricsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetLayoutMetricsResponse.php
@@ -81,7 +81,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->layoutViewport !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetManifestIconsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetManifestIconsResponse.php
index 0b0e9b58..a4679a9e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetManifestIconsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetManifestIconsResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->primaryIcon !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetNavigationHistoryResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetNavigationHistoryResponse.php
index 56e4c1f6..457d198e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetNavigationHistoryResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetNavigationHistoryResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->currentIndex !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsRequest.php
index db36b0e2..32833a3d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsResponse.php
index 9d89fa6c..257a2381 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetOriginTrialsResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->originTrials !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateRequest.php
index cf26bb3f..b4c9725a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateResponse.php
index 66cc2b5c..aad48189 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetPermissionsPolicyStateResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->states !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentRequest.php
index ffaff861..b0c57cfd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentResponse.php
index 5d9369f2..8fd6bb5a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceContentResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->content !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceTreeResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceTreeResponse.php
index 5cd900fe..94dbb4fb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceTreeResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/GetResourceTreeResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameTree !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/HandleJavaScriptDialogRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/HandleJavaScriptDialogRequest.php
index 849044be..678563bb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/HandleJavaScriptDialogRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/HandleJavaScriptDialogRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->accept !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityError.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityError.php
index 697507ab..bc587f14 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityError.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityError.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->errorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityErrorArgument.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityErrorArgument.php
index c3274f46..be138471 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityErrorArgument.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/InstallabilityErrorArgument.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialHiddenEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialHiddenEvent.php
index ea50607f..10294d86 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialHiddenEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialHiddenEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialShownEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialShownEvent.php
index 26ac30c4..6a98d6c5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialShownEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/InterstitialShownEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogClosedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogClosedEvent.php
index 5c97cefd..e09ab11f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogClosedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogClosedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogOpeningEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogOpeningEvent.php
index 3bada05c..06081051 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogOpeningEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/JavascriptDialogOpeningEvent.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/LayoutViewport.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/LayoutViewport.php
index 7729e9c9..2a4c4ea5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/LayoutViewport.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/LayoutViewport.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->pageX !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/LifecycleEventEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/LifecycleEventEvent.php
index 7059a47d..75a86154 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/LifecycleEventEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/LifecycleEventEvent.php
@@ -51,7 +51,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/LoadEventFiredEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/LoadEventFiredEvent.php
index 7636a0a7..264d91b9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/LoadEventFiredEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/LoadEventFiredEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateRequest.php
index 008ed6ae..5e4853dd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateResponse.php
index 305ff1fa..09b42433 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateResponse.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateToHistoryEntryRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateToHistoryEntryRequest.php
index 71b829c4..3cb8451f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateToHistoryEntryRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigateToHistoryEntryRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->entryId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigatedWithinDocumentEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigatedWithinDocumentEvent.php
index 0e8846f5..84d86afd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigatedWithinDocumentEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigatedWithinDocumentEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigationEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigationEntry.php
index f232750c..b4e61c64 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigationEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/NavigationEntry.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrial.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrial.php
index d53eef93..903ded79 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrial.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrial.php
@@ -40,7 +40,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->trialName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialToken.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialToken.php
index 9efd3ed6..a9ebe414 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialToken.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialToken.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialTokenWithStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialTokenWithStatus.php
index 3bfa5a26..881879e9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialTokenWithStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/OriginTrialTokenWithStatus.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->rawTokenText !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyBlockLocator.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyBlockLocator.php
index d9f1ace0..f92dafd1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyBlockLocator.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyBlockLocator.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyFeatureState.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyFeatureState.php
index 17f3d241..8acd8f84 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyFeatureState.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/PermissionsPolicyFeatureState.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->feature !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFRequest.php
index 6f59b95c..f418e6b2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFRequest.php
@@ -179,7 +179,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->landscape !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFResponse.php
index 285e5c8e..9e01e739 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/PrintToPDFResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->data !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ProduceCompilationCacheRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ProduceCompilationCacheRequest.php
index da67bfec..29a1f1ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ProduceCompilationCacheRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ProduceCompilationCacheRequest.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scripts !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ReloadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ReloadRequest.php
index 69c3a134..df9d0dcf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ReloadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ReloadRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->ignoreCache !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnLoadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnLoadRequest.php
index da2d96af..f07345ac 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnLoadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnLoadRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->identifier !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnNewDocumentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnNewDocumentRequest.php
index d8c9b2dd..d6ce1b46 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnNewDocumentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/RemoveScriptToEvaluateOnNewDocumentRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->identifier !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameAckRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameAckRequest.php
index f9d6787a..deaf384b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameAckRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameAckRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameEvent.php
index c989ba6e..e848a8b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->data !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameMetadata.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameMetadata.php
index 78c07267..8ef0dfda 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameMetadata.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastFrameMetadata.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->offsetTop !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastVisibilityChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastVisibilityChangedEvent.php
index eec54f4c..43162149 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastVisibilityChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/ScreencastVisibilityChangedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->visible !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceRequest.php
index 93ae7a68..3b150161 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceResponse.php
index 2e42d32f..3f16a9d0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SearchInResourceResponse.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetAdBlockingEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetAdBlockingEnabledRequest.php
index b98bb0e3..ef683e6e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetAdBlockingEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetAdBlockingEnabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetBypassCSPRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetBypassCSPRequest.php
index be7607fd..ed23d43a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetBypassCSPRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetBypassCSPRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceMetricsOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceMetricsOverrideRequest.php
index de982110..bf35c062 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceMetricsOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceMetricsOverrideRequest.php
@@ -141,7 +141,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->width !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceOrientationOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceOrientationOverrideRequest.php
index ae4abb5f..8adc6540 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceOrientationOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDeviceOrientationOverrideRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->alpha !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDocumentContentRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDocumentContentRequest.php
index f2652a1b..87084b40 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDocumentContentRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDocumentContentRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDownloadBehaviorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDownloadBehaviorRequest.php
index 701e05e4..4fd9f8f0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDownloadBehaviorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetDownloadBehaviorRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->behavior !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontFamiliesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontFamiliesRequest.php
index 18a6937c..c54fbc38 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontFamiliesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontFamiliesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->fontFamilies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontSizesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontSizesRequest.php
index f33310e3..9c28cbfc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontSizesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetFontSizesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->fontSizes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetGeolocationOverrideRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetGeolocationOverrideRequest.php
index 2445785a..9cc95936 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetGeolocationOverrideRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetGeolocationOverrideRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->latitude !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetInterceptFileChooserDialogRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetInterceptFileChooserDialogRequest.php
index 2817ed8b..ad5bcb23 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetInterceptFileChooserDialogRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetInterceptFileChooserDialogRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetLifecycleEventsEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetLifecycleEventsEnabledRequest.php
index 497228dd..e6adf0c7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetLifecycleEventsEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetLifecycleEventsEnabledRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetTouchEmulationEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetTouchEmulationEnabledRequest.php
index a2f07dac..ef4cfc34 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetTouchEmulationEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetTouchEmulationEnabledRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetWebLifecycleStateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetWebLifecycleStateRequest.php
index b7aa6960..375605dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/SetWebLifecycleStateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/SetWebLifecycleStateRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->state !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/StartScreencastRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/StartScreencastRequest.php
index c892fec7..748432dd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/StartScreencastRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/StartScreencastRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->format !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/Viewport.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/Viewport.php
index 7af68c25..ef2a10b2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/Viewport.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/Viewport.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->x !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/VisualViewport.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/VisualViewport.php
index 216ed58b..6e32720c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/VisualViewport.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/VisualViewport.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->offsetX !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Page/WindowOpenEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Page/WindowOpenEvent.php
index 5ff5c936..d98c6a3f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Page/WindowOpenEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Page/WindowOpenEvent.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Performance/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Performance/EnableRequest.php
index ad85b1cc..6e162c0f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Performance/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Performance/EnableRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timeDomain !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Performance/GetMetricsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Performance/GetMetricsResponse.php
index f2b6d379..f53cfa64 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Performance/GetMetricsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Performance/GetMetricsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->metrics !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Performance/Metric.php b/gen-src/ChromeDevtoolsProtocol/Model/Performance/Metric.php
index 9286b6b4..3ed401a1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Performance/Metric.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Performance/Metric.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Performance/MetricsEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Performance/MetricsEvent.php
index bdae0fad..8a1c0c50 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Performance/MetricsEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Performance/MetricsEvent.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->metrics !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Performance/SetTimeDomainRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Performance/SetTimeDomainRequest.php
index 2421c98a..dab94c84 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Performance/SetTimeDomainRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Performance/SetTimeDomainRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timeDomain !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/EnableRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/EnableRequest.php
index 1f996102..e41541dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/EnableRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/EnableRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventTypes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LargestContentfulPaint.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LargestContentfulPaint.php
index 3c9097e3..35fa2bca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LargestContentfulPaint.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LargestContentfulPaint.php
@@ -67,7 +67,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->renderTime !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShift.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShift.php
index 39bad5b0..f1115aa0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShift.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShift.php
@@ -50,7 +50,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShiftAttribution.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShiftAttribution.php
index 072b0785..6c7dd9db 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShiftAttribution.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/LayoutShiftAttribution.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->previousRect !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEvent.php
index 86206f0d..7b4d5222 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEvent.php
@@ -81,7 +81,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->frameId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEventAddedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEventAddedEvent.php
index f5ea6f33..b9ce580b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEventAddedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/PerformanceTimeline/TimelineEventAddedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->event !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileFinishedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileFinishedEvent.php
index aa63fb02..dc2b87b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileFinishedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileFinishedEvent.php
@@ -53,7 +53,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileStartedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileStartedEvent.php
index 4605f3f4..0328795e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileStartedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ConsoleProfileStartedEvent.php
@@ -47,7 +47,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/CoverageRange.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/CoverageRange.php
index 8859bb3c..482cdbc2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/CoverageRange.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/CoverageRange.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->startOffset !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/FunctionCoverage.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/FunctionCoverage.php
index fe582aa8..40aa3985 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/FunctionCoverage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/FunctionCoverage.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->functionName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/GetBestEffortCoverageResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/GetBestEffortCoverageResponse.php
index dff91109..0f12c3bc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/GetBestEffortCoverageResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/GetBestEffortCoverageResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PositionTickInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PositionTickInfo.php
index a68f5dd9..a43e73f9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PositionTickInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PositionTickInfo.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->line !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PreciseCoverageDeltaUpdateEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PreciseCoverageDeltaUpdateEvent.php
index 33e669ce..3d6b1f72 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PreciseCoverageDeltaUpdateEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/PreciseCoverageDeltaUpdateEvent.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/Profile.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/Profile.php
index 5f160825..bb9c8d7e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/Profile.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/Profile.php
@@ -78,7 +78,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodes !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ProfileNode.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ProfileNode.php
index 5ce02772..c1299383 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ProfileNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ProfileNode.php
@@ -87,7 +87,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptCoverage.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptCoverage.php
index 7ef8d550..b72a1cd9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptCoverage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptCoverage.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptTypeProfile.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptTypeProfile.php
index e49455a1..ff79aa90 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptTypeProfile.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/ScriptTypeProfile.php
@@ -52,7 +52,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/SetSamplingIntervalRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/SetSamplingIntervalRequest.php
index d6b4fd0b..50b49d3a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/SetSamplingIntervalRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/SetSamplingIntervalRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->interval !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageRequest.php
index b1d40455..ece84268 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->callCount !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageResponse.php
index 627df6a6..512628b4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StartPreciseCoverageResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StopResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StopResponse.php
index a70ae567..69e251f5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StopResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/StopResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakePreciseCoverageResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakePreciseCoverageResponse.php
index 0576bbe3..8500d40f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakePreciseCoverageResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakePreciseCoverageResponse.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakeTypeProfileResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakeTypeProfileResponse.php
index 79eb12ad..e59f3db2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakeTypeProfileResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TakeTypeProfileResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeObject.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeObject.php
index c73d9893..27d2fd8b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeObject.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeObject.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeProfileEntry.php b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeProfileEntry.php
index 47ff08c4..4f1c2e0b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeProfileEntry.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Profiler/TypeProfileEntry.php
@@ -42,7 +42,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->offset !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AddBindingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AddBindingRequest.php
index d445cea6..5122dcfe 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AddBindingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AddBindingRequest.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseRequest.php
index 8f972452..e51261da 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->promiseObjectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseResponse.php
index 282278e4..a04d49a8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/AwaitPromiseResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/BindingCalledEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/BindingCalledEvent.php
index aa082c7e..4314ae12 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/BindingCalledEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/BindingCalledEvent.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallArgument.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallArgument.php
index 13e2312f..8bbce156 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallArgument.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallArgument.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFrame.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFrame.php
index 4fbb5388..5cfcd15d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFrame.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFrame.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->functionName !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnRequest.php
index db2fc6b3..bdb10385 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnRequest.php
@@ -132,7 +132,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->functionDeclaration !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnResponse.php
index 54ebff21..63b84c62 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CallFunctionOnResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptRequest.php
index b4becdbb..2303fe82 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptRequest.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->expression !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptResponse.php
index d78c1695..b76ed9a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CompileScriptResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ConsoleAPICalledEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ConsoleAPICalledEvent.php
index f28abbb9..611e371a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ConsoleAPICalledEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ConsoleAPICalledEvent.php
@@ -82,7 +82,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CustomPreview.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CustomPreview.php
index 9ae20839..73696c7b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CustomPreview.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/CustomPreview.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->header !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EntryPreview.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EntryPreview.php
index 82bb282a..bfc85c60 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EntryPreview.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EntryPreview.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->key !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateRequest.php
index ede5babb..008eecf7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateRequest.php
@@ -169,7 +169,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->expression !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateResponse.php
index 488ea75b..03162bfe 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/EvaluateResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionDetails.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionDetails.php
index 3a5addb9..c0ce27b1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionDetails.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionDetails.php
@@ -119,7 +119,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->exceptionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionRevokedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionRevokedEvent.php
index dd1e86c8..f013f853 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionRevokedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionRevokedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->reason !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionThrownEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionThrownEvent.php
index f2d4a8c7..a443b13b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionThrownEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExceptionThrownEvent.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->timestamp !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextCreatedEvent.php
index ce6458c5..d671e581 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextCreatedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->context !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDescription.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDescription.php
index 175dd87c..bf538596 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDescription.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDescription.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDestroyedEvent.php
index 2b8ae2be..cc4a797d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextDestroyedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->executionContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextsClearedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextsClearedEvent.php
index f13939d8..aad7c5fa 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextsClearedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ExecutionContextsClearedEvent.php
@@ -18,7 +18,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		return $data;
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetHeapUsageResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetHeapUsageResponse.php
index 6b388afd..11ea6e90 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetHeapUsageResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetHeapUsageResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->usedSize !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetIsolateIdResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetIsolateIdResponse.php
index 40948147..006722d0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetIsolateIdResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetIsolateIdResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesRequest.php
index 26215c01..41ce7394 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesRequest.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesResponse.php
index dda977c0..4979e5ca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GetPropertiesResponse.php
@@ -68,7 +68,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesRequest.php
index 6f4041a9..123adadf 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->executionContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesResponse.php
index d3c0d880..d23a3d07 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/GlobalLexicalScopeNamesResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->names !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InspectRequestedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InspectRequestedEvent.php
index cce7408e..2272624f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InspectRequestedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InspectRequestedEvent.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->object !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InternalPropertyDescriptor.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InternalPropertyDescriptor.php
index a5319313..d87ebecb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InternalPropertyDescriptor.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/InternalPropertyDescriptor.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ObjectPreview.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ObjectPreview.php
index 90b5eb96..851c580e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ObjectPreview.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ObjectPreview.php
@@ -85,7 +85,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PrivatePropertyDescriptor.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PrivatePropertyDescriptor.php
index c2878b3e..03db16f4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PrivatePropertyDescriptor.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PrivatePropertyDescriptor.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyDescriptor.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyDescriptor.php
index 4227562c..6f7eda46 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyDescriptor.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyDescriptor.php
@@ -119,7 +119,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyPreview.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyPreview.php
index 2150d083..15cb7d64 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyPreview.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/PropertyPreview.php
@@ -69,7 +69,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsRequest.php
index 4e1bd119..ef632ff7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->prototypeObjectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsResponse.php
index b52e7fac..383e9731 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/QueryObjectsResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objects !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectGroupRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectGroupRequest.php
index 3276061a..9491e94c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectGroupRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectGroupRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectGroup !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectRequest.php
index c62db542..1c68fec5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/ReleaseObjectRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->objectId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoteObject.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoteObject.php
index 195bf282..21a5a6e8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoteObject.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoteObject.php
@@ -105,7 +105,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoveBindingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoveBindingRequest.php
index a3f834e8..e7fb8cff 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoveBindingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RemoveBindingRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptRequest.php
index f7d8ef43..60ffa4f6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptRequest.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scriptId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptResponse.php
index 5a2ead62..0219d007 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/RunScriptResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->result !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetAsyncCallStackDepthRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetAsyncCallStackDepthRequest.php
index 0d470aa8..fc6bb3a6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetAsyncCallStackDepthRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetAsyncCallStackDepthRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->maxDepth !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetCustomObjectFormatterEnabledRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetCustomObjectFormatterEnabledRequest.php
index 27ec8104..2d495d98 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetCustomObjectFormatterEnabledRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetCustomObjectFormatterEnabledRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->enabled !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetMaxCallStackSizeToCaptureRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetMaxCallStackSizeToCaptureRequest.php
index 340f0c99..f640b4c1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetMaxCallStackSizeToCaptureRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/SetMaxCallStackSizeToCaptureRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->size !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTrace.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTrace.php
index 33de8e72..b600337c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTrace.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTrace.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->description !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTraceId.php b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTraceId.php
index dc4ce65a..1ffc5297 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTraceId.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Runtime/StackTraceId.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->id !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Schema/Domain.php b/gen-src/ChromeDevtoolsProtocol/Model/Schema/Domain.php
index c88beb6b..ee5a0696 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Schema/Domain.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Schema/Domain.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->name !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Schema/GetDomainsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Schema/GetDomainsResponse.php
index b730e41c..27972329 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Schema/GetDomainsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Schema/GetDomainsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->domains !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateErrorEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateErrorEvent.php
index 5ae04e4c..6663d1ad 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateErrorEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateErrorEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateSecurityState.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateSecurityState.php
index 8535453f..b852831c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateSecurityState.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/CertificateSecurityState.php
@@ -202,7 +202,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->protocol !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/HandleCertificateErrorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/HandleCertificateErrorRequest.php
index 7744b0a2..36d24b26 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/HandleCertificateErrorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/HandleCertificateErrorRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->eventId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/InsecureContentStatus.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/InsecureContentStatus.php
index 79de8a92..5d2ae835 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/InsecureContentStatus.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/InsecureContentStatus.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->ranMixedContent !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/SafetyTipInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/SafetyTipInfo.php
index eb1fed35..e037766b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/SafetyTipInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/SafetyTipInfo.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->safetyTipStatus !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateChangedEvent.php
index 6790303f..7be3233f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateChangedEvent.php
@@ -72,7 +72,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityState !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateExplanation.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateExplanation.php
index a7dc7900..a7cc693b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateExplanation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/SecurityStateExplanation.php
@@ -95,7 +95,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityState !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/SetIgnoreCertificateErrorsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/SetIgnoreCertificateErrorsRequest.php
index 0d55b2d0..c9c94e4b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/SetIgnoreCertificateErrorsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/SetIgnoreCertificateErrorsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->ignore !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/SetOverrideCertificateErrorsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/SetOverrideCertificateErrorsRequest.php
index b5057a81..b9833068 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/SetOverrideCertificateErrorsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/SetOverrideCertificateErrorsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->override !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityState.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityState.php
index 6642efbc..3e53fa00 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityState.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityState.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->securityState !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityStateChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityStateChangedEvent.php
index 3f092865..64197069 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityStateChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Security/VisibleSecurityStateChangedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->visibleSecurityState !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DeliverPushMessageRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DeliverPushMessageRequest.php
index 82151dd0..b0549449 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DeliverPushMessageRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DeliverPushMessageRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchPeriodicSyncEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchPeriodicSyncEventRequest.php
index 6af8c56e..dd673d95 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchPeriodicSyncEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchPeriodicSyncEventRequest.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchSyncEventRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchSyncEventRequest.php
index 4f7520e9..81cec223 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchSyncEventRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/DispatchSyncEventRequest.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/InspectWorkerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/InspectWorkerRequest.php
index d6711170..5e650c47 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/InspectWorkerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/InspectWorkerRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->versionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerErrorMessage.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerErrorMessage.php
index eb3cf6ba..67495400 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerErrorMessage.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerErrorMessage.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->errorMessage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerRegistration.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerRegistration.php
index bb89dfa4..821c7337 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerRegistration.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerRegistration.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->registrationId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerVersion.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerVersion.php
index cae7f890..e4748359 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerVersion.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/ServiceWorkerVersion.php
@@ -87,7 +87,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->versionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SetForceUpdateOnPageLoadRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SetForceUpdateOnPageLoadRequest.php
index 47f420ce..cbbb8660 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SetForceUpdateOnPageLoadRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SetForceUpdateOnPageLoadRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->forceUpdateOnPageLoad !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SkipWaitingRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SkipWaitingRequest.php
index 1f7fce45..ee8495a4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SkipWaitingRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/SkipWaitingRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scopeURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StartWorkerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StartWorkerRequest.php
index 03a0a038..444414b7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StartWorkerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StartWorkerRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scopeURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StopWorkerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StopWorkerRequest.php
index 3b34ddd1..443c6da1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StopWorkerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/StopWorkerRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->versionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UnregisterRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UnregisterRequest.php
index e08a8600..820039ae 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UnregisterRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UnregisterRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scopeURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UpdateRegistrationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UpdateRegistrationRequest.php
index 3ca08417..38e767c9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UpdateRegistrationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/UpdateRegistrationRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->scopeURL !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerErrorReportedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerErrorReportedEvent.php
index 2ebd3a45..00ca9d03 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerErrorReportedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerErrorReportedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->errorMessage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerRegistrationUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerRegistrationUpdatedEvent.php
index 2e614db0..a601843e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerRegistrationUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerRegistrationUpdatedEvent.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->registrations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerVersionUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerVersionUpdatedEvent.php
index 0e57b01b..5932b324 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerVersionUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/ServiceWorker/WorkerVersionUpdatedEvent.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->versions !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageContentUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageContentUpdatedEvent.php
index ca72334c..283d507b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageContentUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageContentUpdatedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageListUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageListUpdatedEvent.php
index 223c3199..fb819e39 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageListUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/CacheStorageListUpdatedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearCookiesRequest.php
index 0bab18d1..10f382b3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearCookiesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearDataForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearDataForOriginRequest.php
index 95516f53..689826b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearDataForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearDataForOriginRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensRequest.php
index 56d89fa3..ab8b10c2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->issuerOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensResponse.php
index 56791b26..11e2f3f5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/ClearTrustTokensResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->didDeleteTokens !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesRequest.php
index 5c97f7a8..cc82bcfc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesResponse.php
index 7457daf9..3acfe825 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetCookiesResponse.php
@@ -34,7 +34,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetTrustTokensResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetTrustTokensResponse.php
index 5adfe045..2c7ee8af 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetTrustTokensResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetTrustTokensResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->tokens !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaRequest.php
index d55e09bd..a9e75a31 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaResponse.php
index 015c38e0..e88887cd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/GetUsageAndQuotaResponse.php
@@ -62,7 +62,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->usage !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBContentUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBContentUpdatedEvent.php
index adddff9f..bfe3e180 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBContentUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBContentUpdatedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBListUpdatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBListUpdatedEvent.php
index b0f5bfe6..90005bd3 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBListUpdatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/IndexedDBListUpdatedEvent.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/OverrideQuotaForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/OverrideQuotaForOriginRequest.php
index e554bc1e..575c837e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/OverrideQuotaForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/OverrideQuotaForOriginRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/SetCookiesRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/SetCookiesRequest.php
index b98f487d..319a7f55 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/SetCookiesRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/SetCookiesRequest.php
@@ -44,7 +44,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->cookies !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackCacheStorageForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackCacheStorageForOriginRequest.php
index 8bd680eb..d9096a6c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackCacheStorageForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackCacheStorageForOriginRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackIndexedDBForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackIndexedDBForOriginRequest.php
index 7af0ba37..522d104e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackIndexedDBForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrackIndexedDBForOriginRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrustTokens.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrustTokens.php
index b72ebf17..fa078838 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrustTokens.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/TrustTokens.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->issuerOrigin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackCacheStorageForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackCacheStorageForOriginRequest.php
index cbcdfac6..02bf4925 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackCacheStorageForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackCacheStorageForOriginRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackIndexedDBForOriginRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackIndexedDBForOriginRequest.php
index dbf321bd..36a0bfde 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackIndexedDBForOriginRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UntrackIndexedDBForOriginRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->origin !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UsageForType.php b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UsageForType.php
index d6da85a8..41fbe3a7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Storage/UsageForType.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Storage/UsageForType.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->storageType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUDevice.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUDevice.php
index d677bac8..7b256bc0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUDevice.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUDevice.php
@@ -99,7 +99,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->vendorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUInfo.php
index 9b841509..55fdb376 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GPUInfo.php
@@ -104,7 +104,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->devices !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetInfoResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetInfoResponse.php
index d000935a..bdabf036 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetInfoResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetInfoResponse.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->gpu !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetProcessInfoResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetProcessInfoResponse.php
index d7fa3fe1..24ae146c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetProcessInfoResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/GetProcessInfoResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->processInfo !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ImageDecodeAcceleratorCapability.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ImageDecodeAcceleratorCapability.php
index c837aa9a..cf449a5f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ImageDecodeAcceleratorCapability.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ImageDecodeAcceleratorCapability.php
@@ -65,7 +65,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->imageType !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ProcessInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ProcessInfo.php
index 4f781f4f..f2e3b8d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ProcessInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/ProcessInfo.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->type !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/Size.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/Size.php
index 34f73b37..b5487954 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/Size.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/Size.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->width !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoDecodeAcceleratorCapability.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoDecodeAcceleratorCapability.php
index e98ca3b3..cac3e109 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoDecodeAcceleratorCapability.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoDecodeAcceleratorCapability.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoEncodeAcceleratorCapability.php b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoEncodeAcceleratorCapability.php
index eab7914c..040a29f1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoEncodeAcceleratorCapability.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/SystemInfo/VideoEncodeAcceleratorCapability.php
@@ -55,7 +55,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->profile !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/ActivateTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/ActivateTargetRequest.php
index bfb227ec..0f1446ab 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/ActivateTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/ActivateTargetRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToBrowserTargetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToBrowserTargetResponse.php
index bba83389..b40d6d78 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToBrowserTargetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToBrowserTargetResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetRequest.php
index 88e3f093..f0004e2b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetResponse.php
index a1a151e1..7f8e5dca 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachToTargetResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachedToTargetEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachedToTargetEvent.php
index f31b4261..1619b947 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachedToTargetEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/AttachedToTargetEvent.php
@@ -41,7 +41,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/AutoAttachRelatedRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/AutoAttachRelatedRequest.php
index 40b16423..e30c3068 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/AutoAttachRelatedRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/AutoAttachRelatedRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetRequest.php
index 6a994321..77efa729 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetResponse.php
index 79d9be3b..e93a3295 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CloseTargetResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->success !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextRequest.php
index e6ac5af1..95941424 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->disposeOnDetach !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextResponse.php
index d477d951..eb93a8e7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetRequest.php
index fffe1d61..6c08eb5e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetRequest.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->url !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetResponse.php
index c032f733..363b7a48 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateTargetResponse.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachFromTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachFromTargetRequest.php
index 9eaa1d9f..31a227f1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachFromTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachFromTargetRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachedFromTargetEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachedFromTargetEvent.php
index a24ad2f3..e88e5cac 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachedFromTargetEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/DetachedFromTargetEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/DisposeBrowserContextRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/DisposeBrowserContextRequest.php
index d298d5db..757554cc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/DisposeBrowserContextRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/DisposeBrowserContextRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/ExposeDevToolsProtocolRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/ExposeDevToolsProtocolRequest.php
index 857cbdfa..3677fbdb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/ExposeDevToolsProtocolRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/ExposeDevToolsProtocolRequest.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetBrowserContextsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetBrowserContextsResponse.php
index f7609519..18f22edd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetBrowserContextsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetBrowserContextsResponse.php
@@ -35,7 +35,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->browserContextIds !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoRequest.php
index d94bf803..1ec0235a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoResponse.php
index 9ad6a9a1..bb940bcc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetInfoResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetInfo !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetsResponse.php
index 6f03b5e0..98403213 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/GetTargetsResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetInfos !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/ReceivedMessageFromTargetEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/ReceivedMessageFromTargetEvent.php
index 70b2aee4..f365e6eb 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/ReceivedMessageFromTargetEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/ReceivedMessageFromTargetEvent.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->sessionId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/RemoteLocation.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/RemoteLocation.php
index 9db11de3..d23e261f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/RemoteLocation.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/RemoteLocation.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->host !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/SendMessageToTargetRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/SendMessageToTargetRequest.php
index f7f51259..eba3ce4b 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/SendMessageToTargetRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/SendMessageToTargetRequest.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->message !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetAutoAttachRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetAutoAttachRequest.php
index 2b0d8018..b9fd8a88 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetAutoAttachRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetAutoAttachRequest.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->autoAttach !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetDiscoverTargetsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetDiscoverTargetsRequest.php
index d54da345..3cac6276 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetDiscoverTargetsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetDiscoverTargetsRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->discover !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetRemoteLocationsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetRemoteLocationsRequest.php
index 04ec5c1d..c7001e53 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/SetRemoteLocationsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/SetRemoteLocationsRequest.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->locations !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCrashedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCrashedEvent.php
index a13f337b..aa6abaf2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCrashedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCrashedEvent.php
@@ -45,7 +45,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCreatedEvent.php
index 60791225..cdc20f50 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetCreatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetInfo !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetDestroyedEvent.php
index da5af058..6797dcbc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetDestroyedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfo.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfo.php
index 616e91cc..4a8db2dd 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfo.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfo.php
@@ -89,7 +89,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfoChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfoChangedEvent.php
index 97c25203..7e2c027d 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfoChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Target/TargetInfoChangedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->targetInfo !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/AcceptedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/AcceptedEvent.php
index ac632f15..0beb339a 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/AcceptedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/AcceptedEvent.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->port !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/BindRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/BindRequest.php
index d3d606be..59445e47 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/BindRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/BindRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->port !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/UnbindRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/UnbindRequest.php
index be260eda..c49358b7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tethering/UnbindRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tethering/UnbindRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->port !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/BufferUsageEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/BufferUsageEvent.php
index 772db9bd..42146640 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/BufferUsageEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/BufferUsageEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->percentFull !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/DataCollectedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/DataCollectedEvent.php
index 8c405fba..d6b06053 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/DataCollectedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/DataCollectedEvent.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->value !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/GetCategoriesResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/GetCategoriesResponse.php
index f68a96ce..c444bb64 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/GetCategoriesResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/GetCategoriesResponse.php
@@ -32,7 +32,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->categories !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/MemoryDumpConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/MemoryDumpConfig.php
index 1cf9855c..0854d2b8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/MemoryDumpConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/MemoryDumpConfig.php
@@ -27,7 +27,7 @@ public static function fromJson($rawData)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		return $this->rawData;
 	}
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RecordClockSyncMarkerRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RecordClockSyncMarkerRequest.php
index 224f559f..dc6bef21 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RecordClockSyncMarkerRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RecordClockSyncMarkerRequest.php
@@ -29,7 +29,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->syncId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpRequest.php
index 5f7772d9..1af936a0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpRequest.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->deterministic !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpResponse.php
index a4719dac..b1f25329 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/RequestMemoryDumpResponse.php
@@ -39,7 +39,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->dumpGuid !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/StartRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/StartRequest.php
index 81429f3d..c313a550 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/StartRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/StartRequest.php
@@ -105,7 +105,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->categories !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TraceConfig.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TraceConfig.php
index df05480f..b6a7d82c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TraceConfig.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TraceConfig.php
@@ -108,7 +108,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->recordMode !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TracingCompleteEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TracingCompleteEvent.php
index a769389d..f33c57d1 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TracingCompleteEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/Tracing/TracingCompleteEvent.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->dataLossOccurred !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListener.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListener.php
index 4c0aff1f..99f16e8c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListener.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListener.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->listenerId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerCreatedEvent.php
index 32f5d1ba..80c2c24f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerCreatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->listener !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerWillBeDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerWillBeDestroyedEvent.php
index d5062e4c..a501cea8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerWillBeDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioListenerWillBeDestroyedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNode.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNode.php
index a2143e3f..40c092f5 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNode.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNode.php
@@ -67,7 +67,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->nodeId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeCreatedEvent.php
index 7d34e7d3..31ecf2d2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeCreatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->node !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeWillBeDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeWillBeDestroyedEvent.php
index b3f5d3a9..b70ef0e9 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeWillBeDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioNodeWillBeDestroyedEvent.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParam.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParam.php
index 7925f092..c1ded8fe 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParam.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParam.php
@@ -67,7 +67,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->paramId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamCreatedEvent.php
index 68de5bb1..e6643800 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamCreatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->param !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamWillBeDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamWillBeDestroyedEvent.php
index 63bc1e6e..3fd0598e 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamWillBeDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/AudioParamWillBeDestroyedEvent.php
@@ -37,7 +37,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/BaseAudioContext.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/BaseAudioContext.php
index b47d6fb1..c763273f 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/BaseAudioContext.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/BaseAudioContext.php
@@ -73,7 +73,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextChangedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextChangedEvent.php
index a4ab5881..62d8e98c 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextChangedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextChangedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->context !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextCreatedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextCreatedEvent.php
index 51a02071..d2f02695 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextCreatedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextCreatedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->context !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextRealtimeData.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextRealtimeData.php
index 87e9157b..20c014a4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextRealtimeData.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextRealtimeData.php
@@ -59,7 +59,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->currentTime !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextWillBeDestroyedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextWillBeDestroyedEvent.php
index 0a63d9c6..76812da7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextWillBeDestroyedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/ContextWillBeDestroyedEvent.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataRequest.php
index 8a735529..accd37c8 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataResponse.php
index 9c83cd59..b3caf5b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/GetRealtimeDataResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->realtimeData !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamConnectedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamConnectedEvent.php
index 049c9921..4e2e68a6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamConnectedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamConnectedEvent.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamDisconnectedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamDisconnectedEvent.php
index c5e94979..c21064b6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamDisconnectedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodeParamDisconnectedEvent.php
@@ -43,7 +43,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesConnectedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesConnectedEvent.php
index a9b365a8..43916dc0 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesConnectedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesConnectedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesDisconnectedEvent.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesDisconnectedEvent.php
index b0013b6d..059e50de 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesDisconnectedEvent.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAudio/NodesDisconnectedEvent.php
@@ -49,7 +49,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->contextId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddCredentialRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddCredentialRequest.php
index a3dff81e..2ed72b03 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddCredentialRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddCredentialRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorRequest.php
index 061a50f6..0d81d825 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->options !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorResponse.php
index ebeebf6f..57465dd6 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/AddVirtualAuthenticatorResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/ClearCredentialsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/ClearCredentialsRequest.php
index f501968e..3f5f6f51 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/ClearCredentialsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/ClearCredentialsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/Credential.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/Credential.php
index 8527b6fd..166713f2 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/Credential.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/Credential.php
@@ -81,7 +81,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->credentialId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialRequest.php
index 09a5317b..05fc81dc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialResponse.php
index 042102d8..3d5129d4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialResponse.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->credential !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsRequest.php
index 3680a621..f19aeb01 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsResponse.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsResponse.php
index 1dae7cb0..2d364b95 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsResponse.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/GetCredentialsResponse.php
@@ -28,7 +28,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->credentials !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveCredentialRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveCredentialRequest.php
index 06d555db..32569ce7 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveCredentialRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveCredentialRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveVirtualAuthenticatorRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveVirtualAuthenticatorRequest.php
index 6b298096..7306d2c4 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveVirtualAuthenticatorRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/RemoveVirtualAuthenticatorRequest.php
@@ -25,7 +25,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetAutomaticPresenceSimulationRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetAutomaticPresenceSimulationRequest.php
index 4cf9fdae..0922c7cc 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetAutomaticPresenceSimulationRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetAutomaticPresenceSimulationRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetUserVerifiedRequest.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetUserVerifiedRequest.php
index 21abc8ef..44af4596 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetUserVerifiedRequest.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/SetUserVerifiedRequest.php
@@ -31,7 +31,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->authenticatorId !== null) {
diff --git a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/VirtualAuthenticatorOptions.php b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/VirtualAuthenticatorOptions.php
index d24a9e6d..74ad4b57 100644
--- a/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/VirtualAuthenticatorOptions.php
+++ b/gen-src/ChromeDevtoolsProtocol/Model/WebAuthn/VirtualAuthenticatorOptions.php
@@ -101,7 +101,7 @@ public static function fromJson($data)
 	}
 
 
-	public function jsonSerialize()
+	public function jsonSerialize(): mixed
 	{
 		$data = new \stdClass();
 		if ($this->protocol !== null) {
diff --git a/generate.php b/generate.php
index 4224f006..b973b173 100644
--- a/generate.php
+++ b/generate.php
@@ -432,6 +432,7 @@ private function processDynamicObjectType(string $domain, $typeSpec)
 		$fromJson->addBody("return new static(\$rawData);");
 
 		$jsonSerialize = $objectClass->addMethod("jsonSerialize");
+        $jsonSerialize->setReturnType('mixed');
 		$jsonSerialize->addBody("return \$this->rawData;");
 
 		$objectClass->addMethod("getRawData")
@@ -473,6 +474,7 @@ private function processDynamicObjectType(string $domain, $typeSpec)
 
 			$objectClass->addImplement(\IteratorAggregate::class);
 			$getIterator = $objectClass->addMethod("getIterator");
+            $getIterator->setReturnType(\ArrayIterator::class);
 			$objectClass->getNamespace()->addUse(\ArrayIterator::class, null, $arrayIteratorAlias);
 			$getIterator->addBody("return new {$arrayIteratorAlias}(\$this->headers);");
 		}
@@ -502,6 +504,7 @@ private function processObjectType(string $domain, $typeSpec, bool $withBuilder
 		$fromJson->addBody("\$instance = new static();");
 
 		$jsonSerialize = $objectClass->addMethod("jsonSerialize");
+        $jsonSerialize->setReturnType('mixed');
 		$jsonSerialize->addBody("\$data = new \\stdClass();");
 
 		$builderClass = null;