Apply php-cs-fixer changes

Author: spawnia

src/DateScalar.php

@@ -26,7 +26,7 @@ public function parseValue($value): \DateTimeInterface
         return $this->tryParsingDate($value, Error::class);
     }
 
-    public function parseLiteral($valueNode, array $variables = null): \DateTimeInterface
+    public function parseLiteral($valueNode, ?array $variables = null): \DateTimeInterface
     {
         if (! $valueNode instanceof StringValueNode) {
             throw new Error(

src/JSON.php

@@ -22,7 +22,7 @@ public function parseValue($value)
         return $this->decodeJSON($value);
     }
 
-    public function parseLiteral($valueNode, array $variables = null)
+    public function parseLiteral($valueNode, ?array $variables = null)
     {
         if (! property_exists($valueNode, 'value')) {
             $withoutValue = Printer::doPrint($valueNode);

src/MixedScalar.php

@@ -25,7 +25,7 @@ public function parseValue($value)
         return $value;
     }
 
-    public function parseLiteral($valueNode, array $variables = null)
+    public function parseLiteral($valueNode, ?array $variables = null)
     {
         return AST::valueFromASTUntyped($valueNode);
     }

src/NullScalar.php

@@ -34,7 +34,7 @@ public function parseValue($value)
         return null;
     }
 
-    public function parseLiteral($valueNode, array $variables = null)
+    public function parseLiteral($valueNode, ?array $variables = null)
     {
         if (! $valueNode instanceof NullValueNode) {
             throw new Error(self::ONLY_NULL_IS_ALLOWED);

src/Regex.php

@@ -76,7 +76,7 @@ public function parseValue($value): string
         return $stringValue;
     }
 
-    public function parseLiteral($valueNode, array $variables = null): string
+    public function parseLiteral($valueNode, ?array $variables = null): string
     {
         $value = Utils::extractStringFromLiteral($valueNode);
 

src/StringScalar.php

@@ -72,7 +72,7 @@ public function parseValue($value): string
         return $stringValue;
     }
 
-    public function parseLiteral($valueNode, array $variables = null): string
+    public function parseLiteral($valueNode, ?array $variables = null): string
     {
         $stringValue = Utils::extractStringFromLiteral($valueNode);