@@ -12,5 +12,6 @@
     'array_syntax' => ['syntax' => 'short'],
     'braces' => ['allow_single_line_closure' => true,],
     'no_spaces_after_function_name' => true,
+    'nullable_type_declaration_for_default_null_value' => true,
     'single_blank_line_at_eof' => true,
 ])->setFinder($finder);
@@ -99,7 +99,7 @@ protected function getCustomCommandName(string $commandClass): string
      *
      * @inheritDoc
      */
-    public function run(InputInterface $input = null, OutputInterface $output = null): int
+    public function run(?InputInterface $input = null, ?OutputInterface $output = null): int
     {
         if (!$input instanceof InputInterface) {
             $input = $this->getCoreArguments();
 
@@ -192,7 +192,7 @@ private function registerReporters(): void
         }
     }
 
-    public function run(string $suite, string $test = null, array $config = null): void
+    public function run(string $suite, ?string $test = null, ?array $config = null): void
     {
         ini_set(
             'memory_limit',
@@ -241,7 +241,7 @@ public function run(string $suite, string $test = null, array $config = null): v
         }
     }
 
-    public function runSuite(array $settings, string $suite, string $test = null): void
+    public function runSuite(array $settings, string $suite, ?string $test = null): void
     {
         $settings['shard'] = $this->options['shard'];
         $suiteManager = new SuiteManager($this->dispatcher, $suite, $settings, $this->options);
 
@@ -26,7 +26,7 @@ protected function getSuiteConfig(string $suite): array
         return Configuration::suiteSettings($suite, $this->getGlobalConfig());
     }
 
-    protected function getGlobalConfig(string $conf = null): array
+    protected function getGlobalConfig(?string $conf = null): array
     {
         return Configuration::config($conf);
     }
 
@@ -148,7 +148,7 @@ class Configuration
      * @return array<string, mixed>
      * @throws ConfigurationException
      */
-    public static function config(string $configFile = null): array
+    public static function config(?string $configFile = null): array
     {
         if (!$configFile && self::$config) {
             return self::$config;
 
@@ -8,7 +8,7 @@
 
 class Error extends Exception
 {
-    public function __construct(string $message, int $code, string $file, int $line, \Exception $previous = null)
+    public function __construct(string $message, int $code, string $file, int $line, ?\Exception $previous = null)
     {
         parent::__construct($message, $code, $previous);
 
 
@@ -15,7 +15,7 @@ class ExtensionException extends Exception
      *
      * @param object|string $extension
      */
-    public function __construct($extension, string $message, Exception $previous = null)
+    public function __construct($extension, string $message, ?Exception $previous = null)
     {
         parent::__construct($message, 0, $previous);
         if (is_object($extension)) {
 
@@ -17,7 +17,7 @@ class ModuleConfigException extends Exception
      *
      * @param object|string $module
      */
-    public function __construct($module, string $message, Exception $previous = null)
+    public function __construct($module, string $message, ?Exception $previous = null)
     {
         if (is_object($module)) {
             $module = $module::class;
 
@@ -8,7 +8,7 @@
 
 class TestParseException extends Exception
 {
-    public function __construct(string $fileName, string $errors = null, int $line = null)
+    public function __construct(string $fileName, ?string $errors = null, ?int $line = null)
     {
         $this->message = "Couldn't parse test '{$fileName}'";
         if ($line !== null) {
 
@@ -97,7 +97,7 @@ abstract public function setup();
      *
      * @return mixed|string
      */
-    protected function ask(string $question, string|bool|array $answer = null): mixed
+    protected function ask(string $question, string|bool|array|null $answer = null): mixed
     {
         $question = "? {$question}";
         $dialog = new QuestionHelper();
Original file line number	Diff line number	Diff line change
`@@ -99,7 +99,7 @@ protected function getCustomCommandName(string $commandClass): string`
`99`	`99`	`*`
`100`	`100`	`* @inheritDoc`
`101`	`101`	`*/`
`102`		`- public function run(InputInterface $input = null, OutputInterface $output = null): int`
	`102`	`+ public function run(?InputInterface $input = null, ?OutputInterface $output = null): int`
`103`	`103`	`{`
`104`	`104`	`if (!$input instanceof InputInterface) {`
`105`	`105`	`$input = $this->getCoreArguments();`
Original file line number	Diff line number	Diff line change
`@@ -192,7 +192,7 @@ private function registerReporters(): void`
`192`	`192`	`}`
`193`	`193`	`}`
`194`	`194`
`195`		`- public function run(string $suite, string $test = null, array $config = null): void`
	`195`	`+ public function run(string $suite, ?string $test = null, ?array $config = null): void`
`196`	`196`	`{`
`197`	`197`	`ini_set(`
`198`	`198`	`'memory_limit',`
`@@ -241,7 +241,7 @@ public function run(string $suite, string $test = null, array $config = null): v`
`241`	`241`	`}`
`242`	`242`	`}`
`243`	`243`
`244`		`- public function runSuite(array $settings, string $suite, string $test = null): void`
	`244`	`+ public function runSuite(array $settings, string $suite, ?string $test = null): void`
`245`	`245`	`{`
`246`	`246`	`$settings['shard'] = $this->options['shard'];`
`247`	`247`	`$suiteManager = new SuiteManager($this->dispatcher, $suite, $settings, $this->options);`
Original file line number	Diff line number	Diff line change
`@@ -26,7 +26,7 @@ protected function getSuiteConfig(string $suite): array`
`26`	`26`	`return Configuration::suiteSettings($suite, $this->getGlobalConfig());`
`27`	`27`	`}`
`28`	`28`
`29`		`- protected function getGlobalConfig(string $conf = null): array`
	`29`	`+ protected function getGlobalConfig(?string $conf = null): array`
`30`	`30`	`{`
`31`	`31`	`return Configuration::config($conf);`
`32`	`32`	`}`
Original file line number	Diff line number	Diff line change
`@@ -148,7 +148,7 @@ class Configuration`
`148`	`148`	`* @return array<string, mixed>`
`149`	`149`	`* @throws ConfigurationException`
`150`	`150`	`*/`
`151`		`- public static function config(string $configFile = null): array`
	`151`	`+ public static function config(?string $configFile = null): array`
`152`	`152`	`{`
`153`	`153`	`if (!$configFile && self::$config) {`
`154`	`154`	`return self::$config;`
Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`
`9`	`9`	`class Error extends Exception`
`10`	`10`	`{`
`11`		`- public function __construct(string $message, int $code, string $file, int $line, \Exception $previous = null)`
	`11`	`+ public function __construct(string $message, int $code, string $file, int $line, ?\Exception $previous = null)`
`12`	`12`	`{`
`13`	`13`	`parent::__construct($message, $code, $previous);`
`14`	`14`
Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@ class ExtensionException extends Exception`
`15`	`15`	`*`
`16`	`16`	`* @param object\|string $extension`
`17`	`17`	`*/`
`18`		`- public function __construct($extension, string $message, Exception $previous = null)`
	`18`	`+ public function __construct($extension, string $message, ?Exception $previous = null)`
`19`	`19`	`{`
`20`	`20`	`parent::__construct($message, 0, $previous);`
`21`	`21`	`if (is_object($extension)) {`
Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,7 @@ class ModuleConfigException extends Exception`
`17`	`17`	`*`
`18`	`18`	`* @param object\|string $module`
`19`	`19`	`*/`
`20`		`- public function __construct($module, string $message, Exception $previous = null)`
	`20`	`+ public function __construct($module, string $message, ?Exception $previous = null)`
`21`	`21`	`{`
`22`	`22`	`if (is_object($module)) {`
`23`	`23`	`$module = $module::class;`
Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`
`9`	`9`	`class TestParseException extends Exception`
`10`	`10`	`{`
`11`		`- public function __construct(string $fileName, string $errors = null, int $line = null)`
	`11`	`+ public function __construct(string $fileName, ?string $errors = null, ?int $line = null)`
`12`	`12`	`{`
`13`	`13`	`$this->message = "Couldn't parse test '{$fileName}'";`
`14`	`14`	`if ($line !== null) {`
Original file line number	Diff line number	Diff line change
`@@ -97,7 +97,7 @@ abstract public function setup();`
`97`	`97`	`*`
`98`	`98`	`* @return mixed\|string`
`99`	`99`	`*/`
`100`		`- protected function ask(string $question, string\|bool\|array $answer = null): mixed`
	`100`	`+ protected function ask(string $question, string\|bool\|array\|null $answer = null): mixed`
`101`	`101`	`{`
`102`	`102`	`$question = "? {$question}";`
`103`	`103`	`$dialog = new QuestionHelper();`