Block Type: Add selectors to block.json schema

src/wp-admin/includes/post.php

@@ -2178,6 +2178,7 @@ function taxonomy_meta_box_sanitize_cb_input( $taxonomy, $terms ) {
  * of a block relevant for client registration.
  *
  * @since 5.0.0
+ * @since 6.3.0 Added `selectors` field.
  *
  * @return array An associative array of registered block data.
  */
@@ -2192,6 +2193,7 @@ function get_block_editor_server_block_settings() {
 		'attributes'       => 'attributes',
 		'provides_context' => 'providesContext',
 		'uses_context'     => 'usesContext',
+		'selectors'        => 'selectors',
 		'supports'         => 'supports',
 		'category'         => 'category',
 		'styles'           => 'styles',

src/wp-includes/blocks.php

@@ -300,6 +300,7 @@ function get_block_metadata_i18n_schema() {
  * @since 5.7.0 Added support for `textdomain` field and i18n handling for all translatable fields.
  * @since 5.9.0 Added support for `variations` and `viewScript` fields.
  * @since 6.1.0 Added support for `render` field.
+ * @since 6.3.0 Added `selectors` field.
  *
  * @param string $file_or_folder Path to the JSON file with metadata definition for
  *                               the block or path to the folder where the `block.json` file is located.
@@ -382,6 +383,7 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 		'attributes'      => 'attributes',
 		'providesContext' => 'provides_context',
 		'usesContext'     => 'uses_context',
+		'selectors'       => 'selectors',
 		'supports'        => 'supports',
 		'styles'          => 'styles',
 		'variations'      => 'variations',

src/wp-includes/class-wp-block-type.php

@@ -117,6 +117,14 @@ class WP_Block_Type {
 	 */
 	public $variations = array();
 
+	/**
+	 * Custom CSS selectors for theme.json style generation.
+	 *
+	 * @since 6.3.0
+	 * @var array
+	 */
+	public $selectors = array();
+
 	/**
 	 * Supported features.
 	 *
@@ -245,6 +253,7 @@ class WP_Block_Type {
 	 * @since 6.1.0 Added the `editor_script_handles`, `script_handles`, `view_script_handles,
 	 *              `editor_style_handles`, and `style_handles` properties.
 	 *              Deprecated the `editor_script`, `script`, `view_script`, `editor_style`, and `style` properties.
+	 * @since 6.3.0 Added the `selectors` property.
 	 *
 	 * @see register_block_type()
 	 *
@@ -268,6 +277,7 @@ class WP_Block_Type {
 	 *     @type string|null   $textdomain               The translation textdomain.
 	 *     @type array[]       $styles                   Alternative block styles.
 	 *     @type array[]       $variations               Block variations.
+	 *     @type array         $selectors                Custom CSS selectors for theme.json style generation.
 	 *     @type array|null    $supports                 Supported features.
 	 *     @type array|null    $example                  Structured data for the block preview.
 	 *     @type callable|null $render_callback          Block type render callback.

src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php

@@ -237,6 +237,7 @@ public function get_item( $request ) {
 	 *
 	 * @since 5.5.0
 	 * @since 5.9.0 Renamed `$block_type` to `$item` to match parent class for PHP 8 named parameter support.
+	 * @since 6.3.0 Added `selectors` field.
 	 *
 	 * @param WP_Block_Type   $item    Block type data.
 	 * @param WP_REST_Request $request Full details about the request.
@@ -278,6 +279,7 @@ public function prepare_item_for_response( $item, $request ) {
 				'ancestor',
 				'provides_context',
 				'uses_context',
+				'selectors',
 				'supports',
 				'styles',
 				'textdomain',
@@ -379,6 +381,7 @@ protected function prepare_links( $block_type ) {
 	 * Retrieves the block type' schema, conforming to JSON Schema.
 	 *
 	 * @since 5.5.0
+	 * @since 6.3.0 Added `selectors` field.
 	 *
 	 * @return array Item schema data.
 	 */
@@ -518,6 +521,14 @@ public function get_item_schema() {
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
+				'selectors'             => array(
+					'description' => __( 'Custom CSS selectors.' ),
+					'type'        => 'object',
+					'default'     => array(),
+					'properties'  => array(),
+					'context'     => array( 'embed', 'view', 'edit' ),
+					'readonly'    => true,
+				),
 				'supports'              => array(
 					'description' => __( 'Block supports.' ),
 					'type'        => 'object',

tests/phpunit/data/blocks/notice/block.json

@@ -27,6 +27,9 @@
 			"type": "string"
 		}
 	},
+	"selectors": {
+		"root": ".wp-block-notice"
+	},
 	"supports": {
 		"align": true,
 		"lightBlockWrapper": true

tests/phpunit/tests/admin/includesPost.php

@@ -826,6 +826,7 @@ public function test_get_block_editor_server_block_settings() {
 			'category'        => 'common',
 			'render_callback' => 'foo',
 			'ancestor'        => array( 'core/test-ancestor' ),
+			'selectors'       => array( 'root' => '.wp-block-test' ),
 		);
 
 		register_block_type( $name, $settings );
@@ -845,6 +846,7 @@ public function test_get_block_editor_server_block_settings() {
 					'lock' => array( 'type' => 'object' ),
 				),
 				'usesContext' => array(),
+				'selectors'   => array( 'root' => '.wp-block-test' ),
 				'category'    => 'common',
 				'styles'      => array(),
 				'ancestor'    => array( 'core/test-ancestor' ),

tests/phpunit/tests/blocks/register.php

@@ -483,6 +483,7 @@ public function test_metadata_not_found_in_the_current_directory() {
 	 *
 	 * @ticket 50263
 	 * @ticket 50328
+	 * @ticket 57585
 	 */
 	public function test_block_registers_with_metadata_fixture() {
 		$result = register_block_type_from_metadata(
@@ -515,6 +516,12 @@ public function test_block_registers_with_metadata_fixture() {
 			$result->provides_context
 		);
 		$this->assertSameSets( array( 'groupId' ), $result->uses_context );
+		// @ticket 57585
+		$this->assertSame(
+			array( 'root' => '.wp-block-notice' ),
+			$result->selectors,
+			'Block type should contain selectors from metadata.'
+		);
 		$this->assertSame(
 			array(
 				'align'             => true,

tests/phpunit/tests/rest-api/rest-block-type-controller.php

@@ -196,6 +196,7 @@ public function test_get_block_invalid_name() {
 
 	/**
 	 * @ticket 47620
+	 * @ticket 57585
 	 */
 	public function test_get_item_invalid() {
 		$block_type = 'fake/invalid';
@@ -216,6 +217,7 @@ public function test_get_item_invalid() {
 			'example'          => 'invalid_example',
 			'parent'           => 'invalid_parent',
 			'ancestor'         => 'invalid_ancestor',
+			'selectors'        => 'invalid_selectors',
 			'supports'         => 'invalid_supports',
 			'styles'           => array(),
 			'render_callback'  => 'invalid_callback',
@@ -247,6 +249,7 @@ public function test_get_item_invalid() {
 		$this->assertSameSets( array( 'invalid_keywords' ), $data['keywords'] );
 		$this->assertSameSets( array( 'invalid_parent' ), $data['parent'] );
 		$this->assertSameSets( array( 'invalid_ancestor' ), $data['ancestor'] );
+		$this->assertSameSets( array(), $data['selectors'], 'invalid selectors defaults to empty array' );
 		$this->assertSameSets( array(), $data['supports'] );
 		$this->assertSameSets( array(), $data['styles'] );
 		$this->assertNull( $data['example'] );
@@ -265,6 +268,7 @@ public function test_get_item_invalid() {
 
 	/**
 	 * @ticket 47620
+	 * @ticket 57585
 	 */
 	public function test_get_item_defaults() {
 		$block_type = 'fake/false';
@@ -284,6 +288,7 @@ public function test_get_item_defaults() {
 			'keywords'         => false,
 			'parent'           => false,
 			'ancestor'         => false,
+			'selectors'        => false,
 			'supports'         => false,
 			'styles'           => false,
 			'render_callback'  => false,
@@ -316,6 +321,7 @@ public function test_get_item_defaults() {
 		$this->assertSameSets( array(), $data['keywords'] );
 		$this->assertSameSets( array(), $data['parent'] );
 		$this->assertSameSets( array(), $data['ancestor'] );
+		$this->assertSameSets( array(), $data['selectors'], 'selectors defaults to empty array' );
 		$this->assertSameSets( array(), $data['supports'] );
 		$this->assertSameSets( array(), $data['styles'] );
 		$this->assertNull( $data['example'] );
@@ -534,14 +540,15 @@ public function test_get_variation() {
 
 	/**
 	 * @ticket 47620
+	 * @ticket 57585
 	 */
 	public function test_get_item_schema() {
 		wp_set_current_user( self::$admin_id );
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/block-types' );
 		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
-		$this->assertCount( 28, $properties );
+		$this->assertCount( 29, $properties );
 		$this->assertArrayHasKey( 'api_version', $properties );
 		$this->assertArrayHasKey( 'title', $properties );
 		$this->assertArrayHasKey( 'icon', $properties );
@@ -551,6 +558,7 @@ public function test_get_item_schema() {
 		$this->assertArrayHasKey( 'textdomain', $properties );
 		$this->assertArrayHasKey( 'name', $properties );
 		$this->assertArrayHasKey( 'attributes', $properties );
+		$this->assertArrayHasKey( 'selectors', $properties, 'schema must contain selectors' );
 		$this->assertArrayHasKey( 'supports', $properties );
 		$this->assertArrayHasKey( 'category', $properties );
 		$this->assertArrayHasKey( 'is_dynamic', $properties );