diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 47db796420..570d507f87 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -4776,48 +4776,6 @@ parameters:
 			count: 1
 			path: src/contracts/Collection/MutableArrayList.php
 
-		-
-			message: '#^Binary operation "\." between array\|bool\|float\|int\|string\|null and ''/'' results in an error\.$#'
-			identifier: binaryOp.invalid
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:createFinder\(\) has parameter \$bundlesMetadata with no value type specified in iterable type array\.$#'
-			identifier: missingType.iterableValue
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:dumpConfigurationPaths\(\) has parameter \$paths with no value type specified in iterable type array\.$#'
-			identifier: missingType.iterableValue
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:locateConfigurationFiles\(\) has parameter \$bundlesMetadata with no value type specified in iterable type array\.$#'
-			identifier: missingType.iterableValue
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:locateConfigurationFiles\(\) has parameter \$configFiles with no value type specified in iterable type array\.$#'
-			identifier: missingType.iterableValue
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:locateConfigurationFiles\(\) return type has no value type specified in iterable type array\.$#'
-			identifier: missingType.iterableValue
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
-		-
-			message: '#^Parameter \#1 \$bundlesMetadata of method Ibexa\\Contracts\\Core\\Container\\Encore\\ConfigurationDumper\:\:locateConfigurationFiles\(\) expects array, array\|bool\|float\|int\|string\|null given\.$#'
-			identifier: argument.type
-			count: 1
-			path: src/contracts/Container/Encore/ConfigurationDumper.php
-
 		-
 			message: '#^Method Ibexa\\Contracts\\Core\\FieldType\\BinaryBase\\PathGeneratorInterface\:\:getStoragePathForField\(\) has no return type specified\.$#'
 			identifier: missingType.return
@@ -41814,12 +41772,6 @@ parameters:
 			count: 1
 			path: tests/lib/Collection/MutableArrayMapTest.php
 
-		-
-			message: '#^Parameter \#2 \$string of static method PHPUnit\\Framework\\Assert\:\:assertRegExp\(\) expects string, string\|false given\.$#'
-			identifier: argument.type
-			count: 2
-			path: tests/lib/Container/Encore/ConfigurationDumperTest.php
-
 		-
 			message: '#^Method Ibexa\\Tests\\Core\\Event\\BookmarkServiceTest\:\:testCreateBookmarkEvents\(\) has no return type specified\.$#'
 			identifier: missingType.return
diff --git a/src/contracts/Container/Encore/ConfigurationDumper.php b/src/contracts/Container/Encore/ConfigurationDumper.php
index 92b3736abb..ab556b26f3 100644
--- a/src/contracts/Container/Encore/ConfigurationDumper.php
+++ b/src/contracts/Container/Encore/ConfigurationDumper.php
@@ -20,8 +20,8 @@
  */
 final class ConfigurationDumper
 {
-    public const ENCORE_DIR = 'encore';
-    public const ENCORE_TARGET_PATH = 'var/encore';
+    public const string ENCORE_DIR = 'encore';
+    public const string ENCORE_TARGET_PATH = 'var/encore';
 
     private ContainerInterface $containerBuilder;
 
@@ -38,8 +38,9 @@ public function __construct(ContainerInterface $containerBuilder)
     public function dumpCustomConfiguration(
         array $webpackConfigNames
     ): void {
+        /** @var array<string, array{path: string, namespace: string}> $bundlesMetadata */
         $bundlesMetadata = $this->containerBuilder->getParameter('kernel.bundles_metadata');
-        $rootPath = $this->containerBuilder->getParameter('kernel.project_dir') . '/';
+        $rootPath = $this->getProjectDirectory() . '/';
         foreach ($webpackConfigNames as $configName => $configFiles) {
             $paths = $this->locateConfigurationFiles($bundlesMetadata, $configFiles, $rootPath);
             $this->dumpConfigurationPaths(
@@ -50,6 +51,12 @@ public function dumpCustomConfiguration(
         }
     }
 
+    /**
+     * @param array<string, array{path: string, namespace: string}> $bundlesMetadata
+     * @param array<string, array{'deprecated'?: bool, 'alternative'?: string}> $configFiles
+     *
+     * @return array<string>
+     */
     private function locateConfigurationFiles(
         array $bundlesMetadata,
         array $configFiles,
@@ -67,12 +74,12 @@ private function locateConfigurationFiles(
                         '4.0.0',
                         'Support for old configuration files is deprecated, please update name of %s file, to %s',
                         $fileInfo->getPathname(),
-                        $options['alternative']
+                        $options['alternative'] ?? ''
                     );
                 }
 
                 $path = $fileInfo->getRealPath();
-                if (strpos($path, $rootPath) === 0) {
+                if (str_starts_with($path, $rootPath)) {
                     $path = './' . substr($path, strlen($rootPath));
                 }
 
@@ -84,6 +91,8 @@ private function locateConfigurationFiles(
     }
 
     /**
+     * @param array<string> $paths
+     *
      * @throws \JsonException
      */
     private function dumpConfigurationPaths(
@@ -98,6 +107,9 @@ private function dumpConfigurationPaths(
         );
     }
 
+    /**
+     * @param array<string, array{path: string, namespace: string}> $bundlesMetadata
+     */
     private function createFinder(
         array $bundlesMetadata,
         string $configFile,
@@ -121,4 +133,14 @@ private function createFinder(
 
         return $finder;
     }
+
+    private function getProjectDirectory(): string
+    {
+        $projectDirectory = $this->containerBuilder->getParameter('kernel.project_dir');
+        if (!is_string($projectDirectory)) {
+            throw new \LogicException('Kernel project directory parameter is either not set or is not a string.');
+        }
+
+        return $projectDirectory;
+    }
 }
diff --git a/tests/lib/Container/Encore/ConfigurationDumperTest.php b/tests/lib/Container/Encore/ConfigurationDumperTest.php
index 6e337c9d6a..8876af9084 100644
--- a/tests/lib/Container/Encore/ConfigurationDumperTest.php
+++ b/tests/lib/Container/Encore/ConfigurationDumperTest.php
@@ -18,8 +18,8 @@
  */
 final class ConfigurationDumperTest extends TestCase
 {
-    private const PROJECT_DIR = '/var/io-tests/';
-    private const FOO_BAR_BUNDLE_DIR = 'foo-bar';
+    private const string PROJECT_DIR = '/var/io-tests/';
+    private const string FOO_BAR_BUNDLE_DIR = 'foo-bar';
 
     private Filesystem $filesystem;
 
@@ -64,11 +64,12 @@ public function testDumpCustomConfiguration(): void
         $compiledFilePath = $this->projectDir . '/var/encore/foo-bar.js';
         self::assertFileExists($compiledFilePath);
         $compiledFileContents = file_get_contents($compiledFilePath);
-        self::assertRegExp(
+        self::assertNotFalse($compiledFileContents, "Failed to read compiled file '$compiledFilePath' contents");
+        self::assertMatchesRegularExpression(
             '@^module\.exports = \[.*io-tests\\\/foo-bar\\\/Resources\\\/encore\\\/foo-bar\.js@',
             $compiledFileContents
         );
-        self::assertRegExp(
+        self::assertMatchesRegularExpression(
             '@^module\.exports = \[.*io-tests\\\/encore\\\/foo-bar\.js@',
             $compiledFileContents
         );