added type hints

src/TokenParser/IfTokenParser.php

@@ -30,7 +30,7 @@ use Twig\Token;
  */
 final class IfTokenParser extends AbstractTokenParser
 {
-    public function parse(Token $token)
+    public function parse(Token $token): Node
     {
         $lineno = $token->getLine();
         $expr = $this->parser->getExpressionParser()->parseExpression();
@@ -70,17 +70,17 @@ final class IfTokenParser extends AbstractTokenParser
         return new IfNode(new Node($tests), $else, $lineno, $this->getTag());
     }
 
-    public function decideIfFork(Token $token)
+    public function decideIfFork(Token $token): bool
     {
         return $token->test(['elseif', 'else', 'endif']);
     }
 
-    public function decideIfEnd(Token $token)
+    public function decideIfEnd(Token $token): bool
     {
         return $token->test(['endif']);
     }
 
-    public function getTag()
+    public function getTag(): string
     {
         return 'if';
     }