diff --git a/conf/config.neon b/conf/config.neon
index 937b9633cb..8f7006699e 100644
--- a/conf/config.neon
+++ b/conf/config.neon
@@ -245,6 +245,9 @@ parametersSchema:
 	usedLevel: string()
 	cliAutoloadFile: schema(string(), nullable())
 
+	# internal - static reflection
+	singleReflectionFile: schema(string(), nullable())
+
 services:
 	-
 		class: PhpParser\BuilderFactory
@@ -1154,6 +1157,7 @@ services:
 			analysedPaths: %analysedPaths%
 			composerAutoloaderProjectPaths: %composerAutoloaderProjectPaths%
 			analysedPathsFromConfig: %analysedPathsFromConfig%
+			singleReflectionFile: %singleReflectionFile%
 
 	-
 		implement: PHPStan\Reflection\BetterReflection\BetterReflectionProviderFactory
diff --git a/src/Command/CommandHelper.php b/src/Command/CommandHelper.php
index 0bfcaee8ee..9f2791437e 100644
--- a/src/Command/CommandHelper.php
+++ b/src/Command/CommandHelper.php
@@ -44,7 +44,8 @@ public static function begin(
 		?string $level,
 		bool $allowXdebug,
 		bool $manageMemoryLimitFile = true,
-		bool $debugEnabled = false
+		bool $debugEnabled = false,
+		?string $singleReflectionFile = null
 	): InceptionResult
 	{
 		if (!$allowXdebug) {
@@ -242,7 +243,7 @@ public static function begin(
 		}
 
 		try {
-			$container = $containerFactory->create($tmpDir, $additionalConfigFiles, $paths, $composerAutoloaderProjectPaths, $analysedPathsFromConfig, $allCustomConfigFiles, $level ?? self::DEFAULT_LEVEL, $generateBaselineFile, $autoloadFile);
+			$container = $containerFactory->create($tmpDir, $additionalConfigFiles, $paths, $composerAutoloaderProjectPaths, $analysedPathsFromConfig, $allCustomConfigFiles, $level ?? self::DEFAULT_LEVEL, $generateBaselineFile, $autoloadFile, $singleReflectionFile);
 		} catch (\Nette\DI\InvalidConfigurationException | \Nette\Utils\AssertionException $e) {
 			$errorOutput->writeLineFormatted('<error>Invalid configuration:</error>');
 			$errorOutput->writeLineFormatted($e->getMessage());
diff --git a/src/DependencyInjection/ContainerFactory.php b/src/DependencyInjection/ContainerFactory.php
index 58fe7eeda2..597c813b72 100644
--- a/src/DependencyInjection/ContainerFactory.php
+++ b/src/DependencyInjection/ContainerFactory.php
@@ -46,6 +46,7 @@ public function __construct(string $currentWorkingDirectory)
 	 * @param string $usedLevel
 	 * @param string|null $generateBaselineFile
 	 * @param string|null $cliAutoloadFile
+	 * @param string|null $singleReflectionFile
 	 * @return \PHPStan\DependencyInjection\Container
 	 */
 	public function create(
@@ -57,7 +58,8 @@ public function create(
 		array $allCustomConfigFiles = [],
 		string $usedLevel = CommandHelper::DEFAULT_LEVEL,
 		?string $generateBaselineFile = null,
-		?string $cliAutoloadFile = null
+		?string $cliAutoloadFile = null,
+		?string $singleReflectionFile = null
 	): Container
 	{
 		$configurator = new Configurator(new LoaderFactory(
@@ -85,6 +87,9 @@ public function create(
 			'usedLevel' => $usedLevel,
 			'cliAutoloadFile' => $cliAutoloadFile,
 		]);
+		$configurator->addDynamicParameters([
+			'singleReflectionFile' => $singleReflectionFile,
+		]);
 		$configurator->addConfig($this->configDirectory . '/config.neon');
 		foreach ($additionalConfigFiles as $additionalConfigFile) {
 			$configurator->addConfig($additionalConfigFile);
diff --git a/src/Reflection/BetterReflection/BetterReflectionSourceLocatorFactory.php b/src/Reflection/BetterReflection/BetterReflectionSourceLocatorFactory.php
index e192922550..1dbe18062b 100644
--- a/src/Reflection/BetterReflection/BetterReflectionSourceLocatorFactory.php
+++ b/src/Reflection/BetterReflection/BetterReflectionSourceLocatorFactory.php
@@ -67,6 +67,9 @@ class BetterReflectionSourceLocatorFactory
 	/** @var string[] */
 	private $analysedPathsFromConfig;
 
+	/** @var string|null */
+	private $singleReflectionFile;
+
 	/**
 	 * @param string[] $autoloadDirectories
 	 * @param string[] $autoloadFiles
@@ -75,6 +78,7 @@ class BetterReflectionSourceLocatorFactory
 	 * @param string[] $analysedPaths
 	 * @param string[] $composerAutoloaderProjectPaths
 	 * @param string[] $analysedPathsFromConfig
+	 * @param string|null $singleReflectionFile
 	 */
 	public function __construct(
 		\PhpParser\Parser $parser,
@@ -91,7 +95,8 @@ public function __construct(
 		array $scanDirectories,
 		array $analysedPaths,
 		array $composerAutoloaderProjectPaths,
-		array $analysedPathsFromConfig
+		array $analysedPathsFromConfig,
+		?string $singleReflectionFile
 	)
 	{
 		$this->parser = $parser;
@@ -109,12 +114,17 @@ public function __construct(
 		$this->analysedPaths = $analysedPaths;
 		$this->composerAutoloaderProjectPaths = $composerAutoloaderProjectPaths;
 		$this->analysedPathsFromConfig = $analysedPathsFromConfig;
+		$this->singleReflectionFile = $singleReflectionFile;
 	}
 
 	public function create(): SourceLocator
 	{
 		$locators = [];
 
+		if ($this->singleReflectionFile !== null) {
+			$locators[] = $this->optimizedSingleFileSourceLocatorRepository->getOrCreate($this->singleReflectionFile);
+		}
+
 		foreach ($this->composerAutoloaderProjectPaths as $composerAutoloaderProjectPath) {
 			$locator = $this->composerJsonAndInstalledJsonSourceLocatorMaker->create($composerAutoloaderProjectPath);
 			if ($locator === null) {
diff --git a/src/Reflection/ReflectionProvider/ClassBlacklistReflectionProvider.php b/src/Reflection/ReflectionProvider/ClassBlacklistReflectionProvider.php
index be449ea5d4..05c957f18e 100644
--- a/src/Reflection/ReflectionProvider/ClassBlacklistReflectionProvider.php
+++ b/src/Reflection/ReflectionProvider/ClassBlacklistReflectionProvider.php
@@ -8,6 +8,7 @@
 use PHPStan\Reflection\FunctionReflection;
 use PHPStan\Reflection\GlobalConstantReflection;
 use PHPStan\Reflection\ReflectionProvider;
+use PHPStan\Reflection\ReflectionWithFilename;
 use Roave\BetterReflection\SourceLocator\SourceStubber\PhpStormStubsSourceStubber;
 
 class ClassBlacklistReflectionProvider implements ReflectionProvider
@@ -20,6 +21,8 @@ class ClassBlacklistReflectionProvider implements ReflectionProvider
 	/** @var string[] */
 	private array $patterns;
 
+	private ?string $singleReflectionFile;
+
 	/**
 	 * @param \PHPStan\Reflection\ReflectionProvider $reflectionProvider
 	 * @param string[] $patterns
@@ -27,12 +30,14 @@ class ClassBlacklistReflectionProvider implements ReflectionProvider
 	public function __construct(
 		ReflectionProvider $reflectionProvider,
 		PhpStormStubsSourceStubber $phpStormStubsSourceStubber,
-		array $patterns
+		array $patterns,
+		?string $singleReflectionFile
 	)
 	{
 		$this->reflectionProvider = $reflectionProvider;
 		$this->phpStormStubsSourceStubber = $phpStormStubsSourceStubber;
 		$this->patterns = $patterns;
+		$this->singleReflectionFile = $singleReflectionFile;
 	}
 
 	public function hasClass(string $className): bool
@@ -60,6 +65,11 @@ public function hasClass(string $className): bool
 		}
 
 		$classReflection = $this->reflectionProvider->getClass($className);
+		if ($this->singleReflectionFile !== null) {
+			if ($classReflection->getFileName() === $this->singleReflectionFile) {
+				return false;
+			}
+		}
 		if ($classReflection->isSubclassOf(\DateInterval::class)
 			|| $classReflection->isSubclassOf(\DatePeriod::class)
 			|| $classReflection->isSubclassOf(\DOMDocument::class)
@@ -99,7 +109,21 @@ public function getAnonymousClassReflection(\PhpParser\Node\Stmt\Class_ $classNo
 
 	public function hasFunction(\PhpParser\Node\Name $nameNode, ?Scope $scope): bool
 	{
-		return $this->reflectionProvider->hasFunction($nameNode, $scope);
+		$has = $this->reflectionProvider->hasFunction($nameNode, $scope);
+		if (!$has) {
+			return false;
+		}
+
+		if ($this->singleReflectionFile === null) {
+			return true;
+		}
+
+		$functionReflection = $this->reflectionProvider->getFunction($nameNode, $scope);
+		if (!$functionReflection instanceof ReflectionWithFilename) {
+			return true;
+		}
+
+		return $functionReflection->getFileName() !== $this->singleReflectionFile;
 	}
 
 	public function getFunction(\PhpParser\Node\Name $nameNode, ?Scope $scope): FunctionReflection
diff --git a/src/Testing/TestCase.php b/src/Testing/TestCase.php
index b8abfd072c..e6bb36ef89 100644
--- a/src/Testing/TestCase.php
+++ b/src/Testing/TestCase.php
@@ -233,7 +233,8 @@ private function createRuntimeReflectionProvider(ReflectionProvider $actualRefle
 				'#^PhpParser\\\\#',
 				'#^PHPStan\\\\#',
 				'#^Hoa\\\\#',
-			]
+			],
+			null
 		);
 		$this->setUpReflectionProvider(
 			$actualReflectionProvider,