Clean up Visitor types

Author: spawnia

docs/class-reference.md

@@ -1327,10 +1327,10 @@ visitor API:
 3. Generic visitors that trigger upon entering and leaving any node.
 
    Visitor::visit($ast, [
-      'enter' => function ($node) {
+   'enter' => function (Node $node) {
    // enter any node
    },
-   'leave' => function ($node) {
+   'leave' => function (Node $node) {
    // leave any node
    }
    ]);

phpstan.neon.dist

@@ -45,6 +45,10 @@ parameters:
         - message: "~it's missing from the PHPDoc @throws tag~"
           path: benchmarks
 
+        # Simplifies tests
+        - message: "~Access to an undefined property GraphQL\\\\Language\\\\AST\\\\Node\\:\\:\\$.+~"
+          path: tests/Language/VisitorTest.php
+
 includes:
     - phpstan-baseline.neon
     - phpstan/include-by-php-version.php

src/Language/Visitor.php

@@ -66,10 +66,10 @@
  * 3. Generic visitors that trigger upon entering and leaving any node.
  *
  *     Visitor::visit($ast, [
- *       'enter' => function ($node) {
+ *       'enter' => function (Node $node) {
  *         // enter any node
  *       },
- *       'leave' => function ($node) {
+ *       'leave' => function (Node $node) {
  *         // leave any node
  *       }
  *     ]);