Merge branch 'master' of https://github.com/webonyx/graphql-php

2024-11-21 20:36:05 +03:00 · 2019-05-10 12:03:22 +07:00 · 2019-05-10 12:03:22 +07:00 · 231919fbb2
commit 231919fbb2
parent f107cc2076 22e3b0e981
71 changed files with 240 additions and 211 deletions
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@ -1,7 +1,6 @@
 # Contributing to GraphQL PHP

 ## Workflow
-
 If your contribution requires significant or breaking changes, or if you plan to propose a major new feature,
 we recommend you to create an issue on the [GitHub](https://github.com/webonyx/graphql-php/issues) with
 a brief proposal and discuss it with us first.
@ -14,9 +13,10 @@ For smaller contributions just use this workflow:
 * Check your changes using `composer check-all`
 * Send a pull request

-## Using GraphQL PHP from a Git checkout
+## Setup the Development Environment
+First, copy the URL of your fork and `git clone` it to your local machine.
+
 ```sh
-git clone https://github.com/webonyx/graphql-php.git
 cd graphql-php
 composer install
 ```
@ -29,28 +29,26 @@ composer install
 Some tests have annotation `@see it('<description>')`. It is used for reference to same tests in [graphql-js implementation](https://github.com/graphql/graphql-js) with the same description.

 ## Coding Standard
-Coding standard of this project is based on [Doctrine CS](https://github.com/doctrine/coding-standard). To run the inspection:
+The coding standard of this project is based on [Doctrine CS](https://github.com/doctrine/coding-standard).

+Run the inspections:
 ```sh
 ./vendor/bin/phpcs
 ```

-Auto-fixing:
+Apply automatic code style fixes:
 ```sh
 ./vendor/bin/phpcbf
 ```

 ## Static analysis
-Based on [PHPStan](https://github.com/phpstan/phpstan)
+Based on [PHPStan](https://github.com/phpstan/phpstan).
 ```sh
 ./vendor/bin/phpstan analyse --ansi --memory-limit 256M
 ```

-
 ## Running benchmarks
-
-Benchmarks are run via phpbench:
-
+Benchmarks are run via [PHPBench](https://github.com/phpbench/phpbench).
 ```sh
 ./vendor/bin/phpbench run .
 ```
--- a/README.md
+++ b/README.md
@ -24,11 +24,29 @@ by the Facebook engineering team.
 There are several ready examples in the [examples](examples/) folder of the distribution with specific 
 README file per example.

-## Contribute
-Please refer to [CONTRIBUTING.md](CONTRIBUTING.md) for information on how to contribute.
+## Contributors

-## Old README.md
-Here is a [link to the old README.md](https://github.com/webonyx/graphql-php/blob/v0.9.14/README.md). 
+This project exists thanks to [all the people](https://github.com/webonyx/graphql-php/graphs/contributors) who contribute. [[Contribute](CONTRIBUTING.md)].

-Keep in mind that it relates to the version 0.9.x. It may contain outdated information for 
-newer versions (even though we try to preserve backwards compatibility).
+## Backers
+
+<a href="https://opencollective.com/webonyx-graphql-php#backers" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/backers.svg?width=890"></a>
+
+## Sponsors
+
+Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/webonyx-graphql-php#sponsor)]
+
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/0/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/0/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/1/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/1/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/2/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/2/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/3/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/3/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/4/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/4/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/5/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/5/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/6/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/6/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/7/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/7/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/8/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/8/avatar.svg"></a>
+<a href="https://opencollective.com/webonyx-graphql-php/sponsor/9/website" target="_blank"><img src="https://opencollective.com/webonyx-graphql-php/sponsor/9/avatar.svg"></a>
+
+## License
+
+See [LICENCE](LICENSE).
--- a/composer.json
+++ b/composer.json
@ -14,11 +14,11 @@
    "ext-mbstring": "*"
  },
  "require-dev": {
-    "doctrine/coding-standard": "^5.0",
+    "doctrine/coding-standard": "^6.0",
    "phpbench/phpbench": "^0.14.0",
-    "phpstan/phpstan": "0.10.5",
-    "phpstan/phpstan-phpunit": "0.10.0",
-    "phpstan/phpstan-strict-rules": "0.10.1",
+    "phpstan/phpstan": "^0.11.4",
+    "phpstan/phpstan-phpunit": "^0.11.0",
+    "phpstan/phpstan-strict-rules": "^0.11.0",
    "phpunit/phpcov": "^5.0",
    "phpunit/phpunit": "^7.2",
    "psr/http-message": "^1.0",
--- a/docs/complementary-tools.md
+++ b/docs/complementary-tools.md
@ -2,10 +2,7 @@

 * [Standard Server](executing-queries.md/#using-server) – Out of the box integration with any PSR-7 compatible framework (like [Slim](http://slimframework.com) or [Zend Expressive](http://zendframework.github.io/zend-expressive/)).
 * [Relay Library for graphql-php](https://github.com/ivome/graphql-relay-php) – Helps construct Relay related schema definitions.
-* Laravel 
-  - [Laravel GraphQL](https://github.com/Folkloreatelier/laravel-graphql) – Integration with Laravel 5
-  - [laravel-graphql-relay](https://github.com/nuwave/laravel-graphql-relay) – Relay Helpers for Laravel
-  - [Lighthouse](https://github.com/nuwave/lighthouse) – GraphQL Server for Laravel
+* [Lighthouse](https://github.com/nuwave/lighthouse) – Laravel based, uses Schema Definition Language
 * [OverblogGraphQLBundle](https://github.com/overblog/GraphQLBundle) – Bundle for Symfony
 * [WP-GraphQL](https://github.com/wp-graphql/wp-graphql) - GraphQL API for WordPress

--- a/docs/executing-queries.md
+++ b/docs/executing-queries.md
@ -136,13 +136,13 @@ So for example following batch will require single DB request (if user field is
 ```json
 [
  {
-    "query": "{user(id: 1)} { id }"
+    "query": "{user(id: 1) { id }}"
  },
  {
-    "query": "{user(id: 2)} { id }"
+    "query": "{user(id: 2) { id }}"
  },
  {
-    "query": "{user(id: 3)} { id }"
+    "query": "{user(id: 3) { id }}"
  }
 ]
 ```
--- a/docs/type-system/input-types.md
+++ b/docs/type-system/input-types.md
@ -114,7 +114,7 @@ Option | Type | Notes
 name | `string` | **Required.** Name of the input field. When not set - inferred from **fields** array key
 type | `Type` | **Required.** Instance of one of [Input Types](input-types.md) (**Scalar**, **Enum**, **InputObjectType** + any combination of those with **nonNull** and **listOf** modifiers)
 description | `string` | Plain-text description of this input field for clients (e.g. used by [GraphiQL](https://github.com/graphql/graphiql) for auto-generated documentation)
-defaultValue | `scalar` | Default value of this input field
+defaultValue | `scalar` | Default value of this input field. Use the internal value if specifying a default for an **enum** type

 # Using Input Object Type
 In the example above we defined our InputObjectType. Now let's use it in one of field arguments:
--- a/docs/type-system/object-types.md
+++ b/docs/type-system/object-types.md
@ -94,7 +94,7 @@ Option | Type | Notes
 name | `string` | **Required.** Name of the argument. When not set - inferred from **args** array key
 type | `Type` | **Required.** Instance of one of [Input Types](input-types.md) (**scalar**, **enum**, **InputObjectType** + any combination of those with **nonNull** and **listOf** modifiers)
 description | `string` | Plain-text description of this argument for clients (e.g. used by [GraphiQL](https://github.com/graphql/graphiql) for auto-generated documentation)
-defaultValue | `scalar` | Default value for this argument
+defaultValue | `scalar` | Default value for this argument. Use the internal value if specifying a default for an **enum** type

 # Shorthand field definitions
 Fields can be also defined in **shorthand** notation (with only **name** and **type** options):
--- a/docs/type-system/type-language.md
+++ b/docs/type-system/type-language.md
@ -81,7 +81,7 @@ $cacheFilename = 'cached_schema.php';

 if (!file_exists($cacheFilename)) {
    $document = Parser::parse(file_get_contents('./schema.graphql'));
-    file_put_contents($cacheFilename, "<?php\nreturn " . var_export(AST::toArray($document), true));
+    file_put_contents($cacheFilename, "<?php\nreturn " . var_export(AST::toArray($document), true) . ";\n");
 } else {
    $document = AST::fromArray(require $cacheFilename); // fromArray() is a lazy operation as well
 }
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@ -8,6 +8,8 @@ parameters:
    ignoreErrors:
        - "~Construct empty\\(\\) is not allowed\\. Use more strict comparison~"
        - "~(Method|Property) .+::.+(\\(\\))? (has parameter \\$\\w+ with no|has no return|has no) typehint specified~"
+        - "~Variable property access on .+~"
+        - "~Variable method call on static\\(GraphQL\\\\Server\\\\ServerConfig\\)~" # TODO get rid of

 includes:
 	- vendor/phpstan/phpstan-phpunit/extension.neon
--- a/src/Error/Error.php
+++ b/src/Error/Error.php
@ -122,13 +122,13 @@ class Error extends Exception implements JsonSerializable, ClientAware

        if ($previous instanceof ClientAware) {
            $this->isClientSafe = $previous->isClientSafe();
-            $this->category     = $previous->getCategory() ?: static::CATEGORY_INTERNAL;
+            $this->category     = $previous->getCategory() ?: self::CATEGORY_INTERNAL;
        } elseif ($previous) {
            $this->isClientSafe = false;
-            $this->category     = static::CATEGORY_INTERNAL;
+            $this->category     = self::CATEGORY_INTERNAL;
        } else {
            $this->isClientSafe = true;
-            $this->category     = static::CATEGORY_GRAPHQL;
+            $this->category     = self::CATEGORY_GRAPHQL;
        }
    }

@ -148,10 +148,10 @@ class Error extends Exception implements JsonSerializable, ClientAware
        if ($error instanceof self) {
            if ($error->path && $error->nodes) {
                return $error;
-            } else {
-                $nodes = $nodes ?: $error->nodes;
-                $path  = $path ?: $error->path;
            }
+
+            $nodes = $nodes ?: $error->nodes;
+            $path  = $path ?: $error->path;
        }

        $source     = $positions = $originalError = null;
--- a/src/Error/FormattedError.php
+++ b/src/Error/FormattedError.php
@ -231,7 +231,7 @@ class FormattedError
     *
     * @param mixed[]   $formattedError
     * @param Throwable $e
-     * @param bool      $debug
+     * @param bool|int  $debug
     *
     * @return mixed[]
     *
@ -297,7 +297,7 @@ class FormattedError
     * Prepares final error formatter taking in account $debug flags.
     * If initial formatter is not set, FormattedError::createFromException is used
     *
-     * @param  bool $debug
+     * @param  bool|int $debug
     *
     * @return callable|callable
     */
--- a/src/Error/InvariantViolation.php
+++ b/src/Error/InvariantViolation.php
@ -7,8 +7,6 @@ namespace GraphQL\Error;
 use LogicException;

 /**
- * Class InvariantVoilation
- *
 * Note:
 * This exception should not inherit base Error exception as it is raised when there is an error somewhere in
 * user-land code
--- a/src/Error/UserError.php
+++ b/src/Error/UserError.php
@ -7,8 +7,6 @@ namespace GraphQL\Error;
 use RuntimeException;

 /**
- * Class UserError
- *
 * Error caused by actions of GraphQL clients. Can be safely displayed to a client...
 */
 class UserError extends RuntimeException implements ClientAware
--- a/src/Error/Warning.php
+++ b/src/Error/Warning.php
@ -61,8 +61,6 @@ final class Warning
        } elseif ($suppress === false) {
            self::$enableWarnings = self::ALL;
        } else {
-            $suppress = (int) $suppress;
-
            self::$enableWarnings &= ~$suppress;
        }
    }
@ -86,8 +84,6 @@ final class Warning
        } elseif ($enable === false) {
            self::$enableWarnings = 0;
        } else {
-            $enable = (int) $enable;
-
            self::$enableWarnings |= $enable;
        }
    }
--- a/src/Executor/ExecutionResult.php
+++ b/src/Executor/ExecutionResult.php
@ -154,7 +154,7 @@ class ExecutionResult implements JsonSerializable
        }

        if (! empty($this->extensions)) {
-            $result['extensions'] = (array) $this->extensions;
+            $result['extensions'] = $this->extensions;
        }

        return $result;
--- a/src/Executor/Promise/Adapter/SyncPromise.php
+++ b/src/Executor/Promise/Adapter/SyncPromise.php
@ -13,8 +13,6 @@ use function is_object;
 use function method_exists;

 /**
- * Class SyncPromise
- *
 * Simplistic (yet full-featured) implementation of Promises A+ spec for regular PHP `sync` mode
 * (using queue to defer promises execution)
 */
--- a/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
+++ b/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
@ -160,7 +160,9 @@ class SyncPromiseAdapter implements PromiseAdapter

        if ($syncPromise->state === SyncPromise::FULFILLED) {
            return $syncPromise->result;
-        } elseif ($syncPromise->state === SyncPromise::REJECTED) {
+        }
+
+        if ($syncPromise->state === SyncPromise::REJECTED) {
            throw $syncPromise->result;
        }

--- a/src/Executor/ReferenceExecutor.php
+++ b/src/Executor/ReferenceExecutor.php
@ -182,6 +182,7 @@ class ReferenceExecutor implements ExecutorImplementation
        }
        Utils::invariant($operation, 'Has operation if no errors.');
        Utils::invariant($variableValues !== null, 'Has variables if no errors.');
+
        return new ExecutionContext(
            $schema,
            $fragments,
@ -206,6 +207,7 @@ class ReferenceExecutor implements ExecutorImplementation
        // resolved Promise.
        $data   = $this->executeOperation($this->exeContext->operation, $this->exeContext->rootValue);
        $result = $this->buildResponse($data);
+
        // Note: we deviate here from the reference implementation a bit by always returning promise
        // But for the "sync" case it is always fulfilled
        return $this->isPromise($result)
@ -228,6 +230,7 @@ class ReferenceExecutor implements ExecutorImplementation
        if ($data !== null) {
            $data = (array) $data;
        }
+
        return new ExecutionResult($data, $this->exeContext->errors);
    }

@ -257,13 +260,16 @@ class ReferenceExecutor implements ExecutorImplementation
                    null,
                    function ($error) {
                        $this->exeContext->addError($error);
+
                        return $this->exeContext->promises->createFulfilled(null);
                    }
                );
            }
+
            return $result;
        } catch (Error $error) {
            $this->exeContext->addError($error);
+
            return null;
        }
    }
@ -286,6 +292,7 @@ class ReferenceExecutor implements ExecutorImplementation
                        [$operation]
                    );
                }
+
                return $queryType;
            case 'mutation':
                $mutationType = $schema->getMutationType();
@ -295,6 +302,7 @@ class ReferenceExecutor implements ExecutorImplementation
                        [$operation]
                    );
                }
+
                return $mutationType;
            case 'subscription':
                $subscriptionType = $schema->getSubscriptionType();
@ -304,6 +312,7 @@ class ReferenceExecutor implements ExecutorImplementation
                        [$operation]
                    );
                }
+
                return $subscriptionType;
            default:
                throw new Error(
@ -378,6 +387,7 @@ class ReferenceExecutor implements ExecutorImplementation
                    break;
            }
        }
+
        return $fields;
    }

@ -407,10 +417,8 @@ class ReferenceExecutor implements ExecutorImplementation
            $node,
            $variableValues
        );
-        if (isset($include['if']) && $include['if'] === false) {
-            return false;
-        }
-        return true;
+
+        return ! isset($include['if']) || $include['if'] !== false;
    }

    /**
@ -445,6 +453,7 @@ class ReferenceExecutor implements ExecutorImplementation
        if ($conditionalType instanceof AbstractType) {
            return $this->exeContext->schema->isPossibleType($conditionalType, $type);
        }
+
        return false;
    }

@ -474,10 +483,12 @@ class ReferenceExecutor implements ExecutorImplementation
                if ($promise) {
                    return $promise->then(static function ($resolvedResult) use ($responseName, $results) {
                        $results[$responseName] = $resolvedResult;
+
                        return $results;
                    });
                }
                $results[$responseName] = $result;
+
                return $results;
            },
            []
@ -487,6 +498,7 @@ class ReferenceExecutor implements ExecutorImplementation
                return self::fixResultsIfEmptyArray($resolvedResults);
            });
        }
+
        return self::fixResultsIfEmptyArray($result);
    }

@ -554,6 +566,7 @@ class ReferenceExecutor implements ExecutorImplementation
            $path,
            $result
        );
+
        return $result;
    }

@ -578,12 +591,17 @@ class ReferenceExecutor implements ExecutorImplementation
        $typeNameMetaFieldDef = $typeNameMetaFieldDef ?: Introspection::typeNameMetaFieldDef();
        if ($fieldName === $schemaMetaFieldDef->name && $schema->getQueryType() === $parentType) {
            return $schemaMetaFieldDef;
-        } elseif ($fieldName === $typeMetaFieldDef->name && $schema->getQueryType() === $parentType) {
+        }
+
+        if ($fieldName === $typeMetaFieldDef->name && $schema->getQueryType() === $parentType) {
            return $typeMetaFieldDef;
-        } elseif ($fieldName === $typeNameMetaFieldDef->name) {
+        }
+
+        if ($fieldName === $typeNameMetaFieldDef->name) {
            return $typeNameMetaFieldDef;
        }
        $tmp = $parentType->getFields();
+
        return $tmp[$fieldName] ?? null;
    }

@ -610,6 +628,7 @@ class ReferenceExecutor implements ExecutorImplementation
                $fieldNode,
                $this->exeContext->variableValues
            );
+
            return $resolveFn($source, $args, $context, $info);
        } catch (Exception $error) {
            return $error;
@ -663,15 +682,18 @@ class ReferenceExecutor implements ExecutorImplementation
                    null,
                    function ($error) use ($exeContext) {
                        $exeContext->addError($error);
+
                        return $this->exeContext->promises->createFulfilled(null);
                    }
                );
            }
+
            return $completed;
        } catch (Error $err) {
            // If `completeValueWithLocatedError` returned abruptly (threw an error), log the error
            // and return null.
            $exeContext->addError($err);
+
            return null;
        }
    }
@ -716,6 +738,7 @@ class ReferenceExecutor implements ExecutorImplementation
                    }
                );
            }
+
            return $completed;
        } catch (Exception $error) {
            throw Error::createLocatedError($error, $fieldNodes, $path);
@ -786,6 +809,7 @@ class ReferenceExecutor implements ExecutorImplementation
                    'Cannot return null for non-nullable field ' . $info->parentType . '.' . $info->fieldName . '.'
                );
            }
+
            return $completed;
        }
        // If result is null-like, return null.
@ -863,8 +887,10 @@ class ReferenceExecutor implements ExecutorImplementation
                    Utils::printSafe($promise)
                ));
            }
+
            return $promise;
        }
+
        return null;
    }

@ -891,6 +917,7 @@ class ReferenceExecutor implements ExecutorImplementation
                        return $callback($resolved, $value);
                    });
                }
+
                return $callback($previous, $value);
            },
            $initialValue
@ -928,6 +955,7 @@ class ReferenceExecutor implements ExecutorImplementation
            }
            $completedItems[] = $completedItem;
        }
+
        return $containsPromise ? $this->exeContext->promises->all($completedItems) : $completedItems;
    }

@ -1001,6 +1029,7 @@ class ReferenceExecutor implements ExecutorImplementation
                );
            });
        }
+
        return $this->completeObjectValue(
            $this->ensureValidRuntimeType(
                $runtimeType,
@ -1076,9 +1105,11 @@ class ReferenceExecutor implements ExecutorImplementation
                            return $possibleTypes[$index];
                        }
                    }
+
                    return null;
                });
        }
+
        return null;
    }

@ -1111,6 +1142,7 @@ class ReferenceExecutor implements ExecutorImplementation
                    if (! $isTypeOfResult) {
                        throw $this->invalidReturnTypeError($returnType, $result, $fieldNodes);
                    }
+
                    return $this->collectAndExecuteSubfields(
                        $returnType,
                        $fieldNodes,
@ -1123,6 +1155,7 @@ class ReferenceExecutor implements ExecutorImplementation
                throw $this->invalidReturnTypeError($returnType, $result, $fieldNodes);
            }
        }
+
        return $this->collectAndExecuteSubfields(
            $returnType,
            $fieldNodes,
@ -1164,6 +1197,7 @@ class ReferenceExecutor implements ExecutorImplementation
        &$result
    ) {
        $subFieldNodes = $this->collectSubFields($returnType, $fieldNodes);
+
        return $this->executeFields($returnType, $result, $path, $subFieldNodes);
    }

@ -1189,6 +1223,7 @@ class ReferenceExecutor implements ExecutorImplementation
            }
            $this->subFieldCache[$returnType][$fieldNodes] = $subFieldNodes;
        }
+
        return $this->subFieldCache[$returnType][$fieldNodes];
    }

@ -1222,6 +1257,7 @@ class ReferenceExecutor implements ExecutorImplementation
        if (! $containsPromise) {
            return self::fixResultsIfEmptyArray($finalResults);
        }
+
        // Otherwise, results is a map from field name to the result
        // of resolving that field, which is possibly a promise. Return
        // a promise that will return this same map, but with any
@ -1241,6 +1277,7 @@ class ReferenceExecutor implements ExecutorImplementation
        if ($results === []) {
            return new stdClass();
        }
+
        return $results;
    }

@ -1260,11 +1297,13 @@ class ReferenceExecutor implements ExecutorImplementation
        $keys              = array_keys($assoc);
        $valuesAndPromises = array_values($assoc);
        $promise           = $this->exeContext->promises->all($valuesAndPromises);
+
        return $promise->then(static function ($values) use ($keys) {
            $resolvedResults = [];
            foreach ($values as $i => $value) {
                $resolvedResults[$keys[$i]] = $value;
            }
+
            return self::fixResultsIfEmptyArray($resolvedResults);
        });
    }
@ -1318,6 +1357,7 @@ class ReferenceExecutor implements ExecutorImplementation
                )
            );
        }
+
        return $runtimeType;
    }
 }
--- a/src/Experimental/Executor/Collector.php
+++ b/src/Experimental/Executor/Collector.php
@ -86,11 +86,13 @@ class Collector
            } else {
                $this->runtime->addError(new Error('Must provide an operation.'));
            }
+
            return;
        }

        if ($hasMultipleAssumedOperations) {
            $this->runtime->addError(new Error('Must provide operation name if query contains multiple operations.'));
+
            return;
        }

@ -211,7 +213,9 @@ class Collector

                if (isset($this->visitedFragments[$fragmentName])) {
                    continue;
-                } elseif (! isset($this->fragments[$fragmentName])) {
+                }
+
+                if (! isset($this->fragments[$fragmentName])) {
                    $this->runtime->addError(new Error(
                        sprintf('Fragment "%s" does not exist.', $fragmentName),
                        $selection
--- a/src/Experimental/Executor/CoroutineExecutor.php
+++ b/src/Experimental/Executor/CoroutineExecutor.php
@ -147,6 +147,7 @@ class CoroutineExecutor implements Runtime, ExecutorImplementation
            if ($emptyObjectAsStdClass && empty($array)) {
                return new stdClass();
            }
+
            return $array;
        }

@ -155,6 +156,7 @@ class CoroutineExecutor implements Runtime, ExecutorImplementation
            foreach ($value as $key => $item) {
                $array[$key] = self::resultToArray($item);
            }
+
            return $array;
        }

@ -365,6 +367,7 @@ class CoroutineExecutor implements Runtime, ExecutorImplementation
        // short-circuit evaluation for __typename
        if ($ctx->shared->fieldName === Introspection::TYPE_NAME_FIELD_NAME) {
            $ctx->result->{$ctx->shared->resultName} = $ctx->type->name;
+
            return;
        }

--- a/src/Language/AST/Location.php
+++ b/src/Language/AST/Location.php
@ -59,6 +59,7 @@ class Location
        $tmp        = new static();
        $tmp->start = $start;
        $tmp->end   = $end;
+
        return $tmp;
    }

--- a/src/Language/AST/NodeList.php
+++ b/src/Language/AST/NodeList.php
@ -105,6 +105,7 @@ class NodeList implements ArrayAccess, IteratorAggregate, Countable
        if ($list instanceof self) {
            $list = $list->nodes;
        }
+
        return new NodeList(array_merge($this->nodes, $list));
    }

@ -113,9 +114,8 @@ class NodeList implements ArrayAccess, IteratorAggregate, Countable
     */
    public function getIterator()
    {
-        $count = count($this->nodes);
-        for ($i = 0; $i < $count; $i++) {
-            yield $this->offsetGet($i);
+        foreach ($this->nodes as $key => $_) {
+            yield $this->offsetGet($key);
        }
    }

--- a/src/Language/Lexer.php
+++ b/src/Language/Lexer.php
@ -23,6 +23,22 @@ use function preg_match;
 */
 class Lexer
 {
+    private const TOKEN_BANG      = 33;
+    private const TOKEN_HASH      = 35;
+    private const TOKEN_DOLLAR    = 36;
+    private const TOKEN_AMP       = 38;
+    private const TOKEN_PAREN_L   = 40;
+    private const TOKEN_PAREN_R   = 41;
+    private const TOKEN_DOT       = 46;
+    private const TOKEN_COLON     = 58;
+    private const TOKEN_EQUALS    = 61;
+    private const TOKEN_AT        = 64;
+    private const TOKEN_BRACKET_L = 91;
+    private const TOKEN_BRACKET_R = 93;
+    private const TOKEN_BRACE_L   = 123;
+    private const TOKEN_PIPE      = 124;
+    private const TOKEN_BRACE_R   = 125;
+
    /** @var Source */
    public $source;

@ -92,7 +108,8 @@ class Lexer
     */
    public function advance()
    {
-        $this->lastToken    = $this->token;
+        $this->lastToken = $this->token;
+
        return $this->token = $this->lookahead();
    }

@ -131,44 +148,45 @@ class Lexer
        [, $code, $bytes] = $this->readChar(true);

        switch ($code) {
-            case 33: // !
+            case self::TOKEN_BANG:
                return new Token(Token::BANG, $position, $position + 1, $line, $col, $prev);
-            case 35: // #
+            case self::TOKEN_HASH: // #
                $this->moveStringCursor(-1, -1 * $bytes);

                return $this->readComment($line, $col, $prev);
-            case 36: // $
+            case self::TOKEN_DOLLAR:
                return new Token(Token::DOLLAR, $position, $position + 1, $line, $col, $prev);
-            case 38: // &
+            case self::TOKEN_AMP:
                return new Token(Token::AMP, $position, $position + 1, $line, $col, $prev);
-            case 40: // (
+            case self::TOKEN_PAREN_L:
                return new Token(Token::PAREN_L, $position, $position + 1, $line, $col, $prev);
-            case 41: // )
+            case self::TOKEN_PAREN_R:
                return new Token(Token::PAREN_R, $position, $position + 1, $line, $col, $prev);
-            case 46: // .
+            case self::TOKEN_DOT: // .
                [, $charCode1] = $this->readChar(true);
                [, $charCode2] = $this->readChar(true);

-                if ($charCode1 === 46 && $charCode2 === 46) {
+                if ($charCode1 === self::TOKEN_DOT && $charCode2 === self::TOKEN_DOT) {
                    return new Token(Token::SPREAD, $position, $position + 3, $line, $col, $prev);
                }
                break;
-            case 58: // :
+            case self::TOKEN_COLON:
                return new Token(Token::COLON, $position, $position + 1, $line, $col, $prev);
-            case 61: // =
+            case self::TOKEN_EQUALS:
                return new Token(Token::EQUALS, $position, $position + 1, $line, $col, $prev);
-            case 64: // @
+            case self::TOKEN_AT:
                return new Token(Token::AT, $position, $position + 1, $line, $col, $prev);
-            case 91: // [
+            case self::TOKEN_BRACKET_L:
                return new Token(Token::BRACKET_L, $position, $position + 1, $line, $col, $prev);
-            case 93: // ]
+            case self::TOKEN_BRACKET_R:
                return new Token(Token::BRACKET_R, $position, $position + 1, $line, $col, $prev);
-            case 123: // {
+            case self::TOKEN_BRACE_L:
                return new Token(Token::BRACE_L, $position, $position + 1, $line, $col, $prev);
-            case 124: // |
+            case self::TOKEN_PIPE:
                return new Token(Token::PIPE, $position, $position + 1, $line, $col, $prev);
-            case 125: // }
+            case self::TOKEN_BRACE_R:
                return new Token(Token::BRACE_R, $position, $position + 1, $line, $col, $prev);
+
            // A-Z
            case 65:
            case 66:
@ -227,6 +245,7 @@ class Lexer
            case 122:
                return $this->moveStringCursor(-1, -1 * $bytes)
                    ->readName($line, $col, $prev);
+
            // -
            case 45:
                // 0-9
@ -242,6 +261,7 @@ class Lexer
            case 57:
                return $this->moveStringCursor(-1, -1 * $bytes)
                    ->readNumber($line, $col, $prev);
+
            // "
            case 34:
                [, $nextCode]     = $this->readChar();
@ -564,10 +584,10 @@ class Lexer
                        $prev,
                        BlockString::value($value)
                    );
-                } else {
-                    // move cursor back to before the first quote
-                    $this->moveStringCursor(-2, -2);
                }
+
+                // move cursor back to before the first quote
+                $this->moveStringCursor(-2, -2);
            }

            $this->assertValidBlockStringCharacterCode($code, $this->position);
--- a/src/Language/Parser.php
+++ b/src/Language/Parser.php
@ -439,7 +439,6 @@ class Parser
                case 'mutation':
                case 'subscription':
                    return $this->parseOperationDefinition();
-
                case 'fragment':
                    return $this->parseFragmentDefinition();
            }
@ -827,7 +826,9 @@ class Parser
                        'value' => $token->value === 'true',
                        'loc'   => $this->loc($token),
                    ]);
-                } elseif ($token->value === 'null') {
+                }
+
+                if ($token->value === 'null') {
                    $this->lexer->advance();

                    return new NullValueNode([
--- a/src/Language/Printer.php
+++ b/src/Language/Printer.php
@ -115,6 +115,7 @@ class Printer
                        $varDefs      = $this->wrap('(', $this->join($node->variableDefinitions, ', '), ')');
                        $directives   = $this->join($node->directives, ' ');
                        $selectionSet = $node->selectionSet;
+
                        // Anonymous queries with no directives or variable definitions can use
                        // the query short form.
                        return ! $name && ! $directives && ! $varDefs && $op === 'query'
--- a/src/Server/OperationParams.php
+++ b/src/Server/OperationParams.php
@ -62,13 +62,10 @@ class OperationParams
     * Creates an instance from given array
     *
     * @param mixed[] $params
-     * @param bool    $readonly
-     *
-     * @return OperationParams
     *
     * @api
     */
-    public static function create(array $params, $readonly = false)
+    public static function create(array $params, bool $readonly = false) : OperationParams
    {
        $instance = new static();

@ -108,7 +105,7 @@ class OperationParams
        $instance->operation  = $params['operationname'];
        $instance->variables  = $params['variables'];
        $instance->extensions = $params['extensions'];
-        $instance->readOnly   = (bool) $readonly;
+        $instance->readOnly   = $readonly;

        // Apollo server/client compatibility: look for the queryid in extensions
        if (isset($instance->extensions['persistedQuery']['sha256Hash']) && empty($instance->query) && empty($instance->queryId)) {
--- a/src/Server/ServerConfig.php
+++ b/src/Server/ServerConfig.php
@ -225,15 +225,11 @@ class ServerConfig
    /**
     * Allow batching queries (disabled by default)
     *
-     * @param bool $enableBatching
-     *
-     * @return self
-     *
     * @api
     */
-    public function setQueryBatching($enableBatching)
+    public function setQueryBatching(bool $enableBatching) : self
    {
-        $this->queryBatching = (bool) $enableBatching;
+        $this->queryBatching = $enableBatching;

        return $this;
    }
--- a/src/Server/StandardServer.php
+++ b/src/Server/StandardServer.php
@ -151,6 +151,7 @@ class StandardServer
        StreamInterface $writableBodyStream
    ) {
        $result = $this->executePsrRequest($request);
+
        return $this->helper->toPsrResponse($result, $response, $writableBodyStream);
    }

@ -165,6 +166,7 @@ class StandardServer
    public function executePsrRequest(ServerRequestInterface $request)
    {
        $parsedBody = $this->helper->parsePsrRequest($request);
+
        return $this->executeRequest($parsedBody);
    }

--- a/src/Type/Definition/BooleanType.php
+++ b/src/Type/Definition/BooleanType.php
@ -11,9 +11,6 @@ use GraphQL\Language\AST\Node;
 use GraphQL\Utils\Utils;
 use function is_bool;

-/**
- * Class BooleanType
- */
 class BooleanType extends ScalarType
 {
    /** @var string */
@ -58,11 +55,11 @@ class BooleanType extends ScalarType
     */
    public function parseLiteral($valueNode, ?array $variables = null)
    {
-        if ($valueNode instanceof BooleanValueNode) {
-            return (bool) $valueNode->value;
+        if (! $valueNode instanceof BooleanValueNode) {
+            // Intentionally without message, as all information already in wrapped Exception
+            throw new Exception();
        }

-        // Intentionally without message, as all information already in wrapped Exception
-        throw new Exception();
+        return $valueNode->value;
    }
 }
--- a/src/Type/Definition/CustomScalarType.php
+++ b/src/Type/Definition/CustomScalarType.php
@ -12,9 +12,6 @@ use function call_user_func;
 use function is_callable;
 use function sprintf;

-/**
- * Class CustomScalarType
- */
 class CustomScalarType extends ScalarType
 {
    /**
--- a/src/Type/Definition/Directive.php
+++ b/src/Type/Definition/Directive.php
@ -12,9 +12,6 @@ use function array_keys;
 use function in_array;
 use function is_array;

-/**
- * Class Directive
- */
 class Directive
 {
    public const DEFAULT_DEPRECATION_REASON = 'No longer supported';
@ -40,7 +37,7 @@ class Directive
    public $locations;

    /** @var FieldArgument[] */
-    public $args;
+    public $args = [];

    /** @var DirectiveDefinitionNode|null */
    public $astNode;
@ -80,6 +77,7 @@ class Directive
    public static function includeDirective()
    {
        $internal = self::getInternalDirectives();
+
        return $internal['include'];
    }

@ -140,24 +138,30 @@ class Directive
                ]),
            ];
        }
+
        return self::$internalDirectives;
    }
+
    /**
     * @return Directive
     */
    public static function skipDirective()
    {
        $internal = self::getInternalDirectives();
+
        return $internal['skip'];
    }
+
    /**
     * @return Directive
     */
    public static function deprecatedDirective()
    {
        $internal = self::getInternalDirectives();
+
        return $internal['deprecated'];
    }
+
    /**
     * @return bool
     */
--- a/src/Type/Definition/EnumType.php
+++ b/src/Type/Definition/EnumType.php
@ -19,9 +19,6 @@ use function is_int;
 use function is_string;
 use function sprintf;

-/**
- * Class EnumType
- */
 class EnumType extends Type implements InputType, OutputType, LeafType, NullableType, NamedType
 {
    /** @var EnumTypeDefinitionNode|null */
@ -33,7 +30,7 @@ class EnumType extends Type implements InputType, OutputType, LeafType, Nullable
    /** @var MixedStore<mixed, EnumValueDefinition> */
    private $valueLookup;

-    /** @var \ArrayObject<string, EnumValueDefinition> */
+    /** @var ArrayObject<string, EnumValueDefinition> */
    private $nameLookup;

    /** @var EnumTypeExtensionNode[] */
@ -71,7 +68,7 @@ class EnumType extends Type implements InputType, OutputType, LeafType, Nullable
    }

    /**
-     * @return \ArrayObject<string, EnumValueDefinition>
+     * @return ArrayObject<string, EnumValueDefinition>
     */
    private function getNameLookup()
    {
--- a/src/Type/Definition/EnumValueDefinition.php
+++ b/src/Type/Definition/EnumValueDefinition.php
@ -6,9 +6,6 @@ namespace GraphQL\Type\Definition;

 use GraphQL\Language\AST\EnumValueDefinitionNode;

-/**
- * Class EnumValueDefinition
- */
 class EnumValueDefinition
 {
    /** @var string */
--- a/src/Type/Definition/FieldArgument.php
+++ b/src/Type/Definition/FieldArgument.php
@ -11,9 +11,6 @@ use function is_array;
 use function is_string;
 use function sprintf;

-/**
- * Class FieldArgument
- */
 class FieldArgument
 {
    /** @var string */
--- a/src/Type/Definition/FieldDefinition.php
+++ b/src/Type/Definition/FieldDefinition.php
@ -81,7 +81,7 @@ class FieldDefinition

        $this->config = $config;

-        $this->complexityFn = $config['complexity'] ?? static::DEFAULT_COMPLEXITY_FN;
+        $this->complexityFn = $config['complexity'] ?? self::DEFAULT_COMPLEXITY_FN;
    }

    public static function defineFieldMap(Type $type, $fields)
--- a/src/Type/Definition/FloatType.php
+++ b/src/Type/Definition/FloatType.php
@ -12,9 +12,6 @@ use GraphQL\Language\AST\Node;
 use GraphQL\Utils\Utils;
 use function is_numeric;

-/**
- * Class FloatType
- */
 class FloatType extends ScalarType
 {
    /** @var string */
--- a/src/Type/Definition/InputObjectType.php
+++ b/src/Type/Definition/InputObjectType.php
@ -15,9 +15,6 @@ use function is_callable;
 use function is_string;
 use function sprintf;

-/**
- * Class InputObjectType
- */
 class InputObjectType extends Type implements InputType, NullableType, NamedType
 {
    /** @var InputObjectTypeDefinitionNode|null */
--- a/src/Type/Definition/IntType.php
+++ b/src/Type/Definition/IntType.php
@ -14,9 +14,6 @@ use function intval;
 use function is_bool;
 use function is_numeric;

-/**
- * Class IntType
- */
 class IntType extends ScalarType
 {
    // As per the GraphQL Spec, Integers are only treated as valid when a valid
--- a/src/Type/Definition/InterfaceType.php
+++ b/src/Type/Definition/InterfaceType.php
@ -12,9 +12,6 @@ use function is_callable;
 use function is_string;
 use function sprintf;

-/**
- * Class InterfaceType
- */
 class InterfaceType extends Type implements AbstractType, OutputType, CompositeType, NullableType, NamedType
 {
    /** @var InterfaceTypeDefinitionNode|null */
--- a/src/Type/Definition/ListOfType.php
+++ b/src/Type/Definition/ListOfType.php
@ -4,9 +4,6 @@ declare(strict_types=1);

 namespace GraphQL\Type\Definition;

-/**
- * Class ListOfType
- */
 class ListOfType extends Type implements WrappingType, OutputType, NullableType, InputType
 {
    /** @var ObjectType|InterfaceType|UnionType|ScalarType|InputObjectType|EnumType */
@ -20,15 +17,9 @@ class ListOfType extends Type implements WrappingType, OutputType, NullableType,
        $this->ofType = Type::assertType($type);
    }

-    /**
-     * @return string
-     */
-    public function toString()
+    public function toString() : string
    {
-        $type = $this->ofType;
-        $str  = $type instanceof Type ? $type->toString() : (string) $type;
-
-        return '[' . $str . ']';
+        return '[' . $this->ofType->toString() . ']';
    }

    /**
--- a/src/Type/Definition/NonNull.php
+++ b/src/Type/Definition/NonNull.php
@ -6,9 +6,6 @@ namespace GraphQL\Type\Definition;

 use GraphQL\Utils\Utils;

-/**
- * Class NonNull
- */
 class NonNull extends Type implements WrappingType, OutputType, InputType
 {
    /** @var NullableType */
--- a/src/Type/Definition/QueryPlan.php
+++ b/src/Type/Definition/QueryPlan.php
@ -183,6 +183,7 @@ class QueryPlan
                );
            }
        }
+
        return $fields;
    }

--- a/src/Type/Definition/ResolveInfo.php
+++ b/src/Type/Definition/ResolveInfo.php
@ -226,6 +226,7 @@ class ResolveInfo
                );
            }
        }
+
        return $fields;
    }
 }
--- a/src/Type/Definition/StringType.php
+++ b/src/Type/Definition/StringType.php
@ -14,9 +14,6 @@ use function is_object;
 use function is_scalar;
 use function method_exists;

-/**
- * Class StringType
- */
 class StringType extends ScalarType
 {
    /** @var string */
--- a/src/Type/Definition/Type.php
+++ b/src/Type/Definition/Type.php
@ -194,6 +194,7 @@ abstract class Type implements JsonSerializable
    public static function getInternalTypes()
    {
        trigger_error(__METHOD__ . ' is deprecated. Use Type::getStandardTypes() instead', E_USER_DEPRECATED);
+
        return self::getStandardTypes();
    }

--- a/src/Type/Definition/UnionType.php
+++ b/src/Type/Definition/UnionType.php
@ -14,9 +14,6 @@ use function is_callable;
 use function is_string;
 use function sprintf;

-/**
- * Class UnionType
- */
 class UnionType extends Type implements AbstractType, OutputType, CompositeType, NullableType, NamedType
 {
    /** @var UnionTypeDefinitionNode */
--- a/src/Utils/AST.php
+++ b/src/Utils/AST.php
@ -353,6 +353,7 @@ class AST
                // No valid return value.
                return $undefined;
            }
+
            // Note: we're not doing any checking that this variable is correct. We're
            // assuming that this query has been validated and the variable usage here
            // is of the correct type.
--- a/src/Utils/ASTDefinitionBuilder.php
+++ b/src/Utils/ASTDefinitionBuilder.php
@ -144,7 +144,8 @@ class ASTDefinitionBuilder
                // Note: While this could make assertions to get the correctly typed
                // value, that would throw immediately while type system validation
                // with validateSchema() will produce more actionable results.
-                $type   = $this->internalBuildWrappedType($value->type);
+                $type = $this->internalBuildWrappedType($value->type);
+
                $config = [
                    'name'        => $value->name->value,
                    'type'        => $type,
--- a/src/Utils/BreakingChangesFinder.php
+++ b/src/Utils/BreakingChangesFinder.php
@ -531,12 +531,12 @@ class BreakingChangesFinder
                        ];
                    }
                    // Check if a non-null arg was added to the field
-                    foreach ($newTypeFields[$fieldName]->args as $newArgDef) {
+                    foreach ($newTypeFields[$fieldName]->args as $newTypeFieldArgDef) {
                        $oldArgs   = $oldTypeFields[$fieldName]->args;
                        $oldArgDef = Utils::find(
                            $oldArgs,
-                            static function ($arg) use ($newArgDef) {
-                                return $arg->name === $newArgDef->name;
+                            static function ($arg) use ($newTypeFieldArgDef) {
+                                return $arg->name === $newTypeFieldArgDef->name;
                            }
                        );

@ -545,8 +545,8 @@ class BreakingChangesFinder
                        }

                        $newTypeName = $newType->name;
-                        $newArgName  = $newArgDef->name;
-                        if ($newArgDef->getType() instanceof NonNull) {
+                        $newArgName  = $newTypeFieldArgDef->name;
+                        if ($newTypeFieldArgDef->getType() instanceof NonNull) {
                            $breakingChanges[] = [
                                'type'        => self::BREAKING_CHANGE_NON_NULL_ARG_ADDED,
                                'description' => "A non-null arg ${newArgName} on ${newTypeName}.${fieldName} was added",
@ -668,7 +668,7 @@ class BreakingChangesFinder
    {
        $removedArgs = [];
        $newArgMap   = self::getArgumentMapForDirective($newDirective);
-        foreach ((array) $oldDirective->args as $arg) {
+        foreach ($oldDirective->args as $arg) {
            if (isset($newArgMap[$arg->name])) {
                continue;
            }
@ -727,7 +727,7 @@ class BreakingChangesFinder
    {
        $addedArgs = [];
        $oldArgMap = self::getArgumentMapForDirective($oldDirective);
-        foreach ((array) $newDirective->args as $arg) {
+        foreach ($newDirective->args as $arg) {
            if (isset($oldArgMap[$arg->name])) {
                continue;
            }
--- a/src/Utils/MixedStore.php
+++ b/src/Utils/MixedStore.php
@ -22,8 +22,6 @@ use function is_string;
 *
 * Note: unfortunately when storing array as key - access and modification is O(N)
 * (yet this should be really rare case and should be avoided when possible)
- *
- * Class MixedStore
 */
 class MixedStore implements ArrayAccess
 {
--- a/src/Utils/SchemaExtender.php
+++ b/src/Utils/SchemaExtender.php
@ -66,6 +66,7 @@ class SchemaExtender

            return $type->extensionASTNodes;
        }
+
        return static::$typeExtensionsMap[$name] ?? null;
    }

@ -284,6 +285,7 @@ class SchemaExtender
                }
            }
        }
+
        return $interfaces;
    }

--- a/src/Utils/SchemaPrinter.php
+++ b/src/Utils/SchemaPrinter.php
@ -153,11 +153,8 @@ class SchemaPrinter
        }

        $subscriptionType = $schema->getSubscriptionType();
-        if ($subscriptionType && $subscriptionType->name !== 'Subscription') {
-            return false;
-        }

-        return true;
+        return ! $subscriptionType || $subscriptionType->name === 'Subscription';
    }

    private static function printDirective($directive, $options) : string
--- a/src/Utils/TypeComparators.php
+++ b/src/Utils/TypeComparators.php
@ -86,18 +86,12 @@ class TypeComparators

        // If superType type is an abstract type, maybeSubType type may be a currently
        // possible object type.
-        if (Type::isAbstractType($superType) &&
+        return Type::isAbstractType($superType) &&
            $maybeSubType instanceof ObjectType &&
            $schema->isPossibleType(
                $superType,
                $maybeSubType
-            )
-        ) {
-            return true;
-        }
-
-        // Otherwise, the child type is not a valid subtype of the parent type.
-        return false;
+            );
    }

    /**
@ -131,13 +125,11 @@ class TypeComparators
                return false;
            }

-            /** @var $typeB ObjectType */
            // Determine if the latter type is a possible concrete type of the former.
            return $schema->isPossibleType($typeA, $typeB);
        }

        if ($typeB instanceof AbstractType) {
-            /** @var $typeA ObjectType */
            // Determine if the former type is a possible concrete type of the latter.
            return $schema->isPossibleType($typeB, $typeA);
        }
--- a/src/Utils/TypeInfo.php
+++ b/src/Utils/TypeInfo.php
@ -28,6 +28,7 @@ use GraphQL\Type\Definition\UnionType;
 use GraphQL\Type\Definition\WrappingType;
 use GraphQL\Type\Introspection;
 use GraphQL\Type\Schema;
+use SplStack;
 use function array_map;
 use function array_merge;
 use function array_pop;
@ -35,24 +36,21 @@ use function count;
 use function is_array;
 use function sprintf;

-/**
- * Class TypeInfo
- */
 class TypeInfo
 {
    /** @var Schema */
    private $schema;

-    /** @var \SplStack<OutputType> */
+    /** @var SplStack<OutputType> */
    private $typeStack;

-    /** @var \SplStack<CompositeType> */
+    /** @var SplStack<CompositeType> */
    private $parentTypeStack;

-    /** @var \SplStack<InputType> */
+    /** @var SplStack<InputType> */
    private $inputTypeStack;

-    /** @var \SplStack<FieldDefinition> */
+    /** @var SplStack<FieldDefinition> */
    private $fieldDefStack;

    /** @var Directive */
@ -155,6 +153,7 @@ class TypeInfo
            if (! $alreadyInMap) {
                $typeMap[$i] = $type;
            }
+
            return $typeMap;
        }

@ -178,7 +177,7 @@ class TypeInfo
            $nestedTypes = array_merge($nestedTypes, $type->getInterfaces());
        }
        if ($type instanceof ObjectType || $type instanceof InterfaceType) {
-            foreach ((array) $type->getFields() as $fieldName => $field) {
+            foreach ($type->getFields() as $fieldName => $field) {
                if (! empty($field->args)) {
                    $fieldArgTypes = array_map(
                        static function (FieldArgument $arg) {
@ -193,12 +192,12 @@ class TypeInfo
            }
        }
        if ($type instanceof InputObjectType) {
-            foreach ((array) $type->getFields() as $fieldName => $field) {
+            foreach ($type->getFields() as $fieldName => $field) {
                $nestedTypes[] = $field->getType();
            }
        }
-        foreach ($nestedTypes as $type) {
-            $typeMap = self::extractTypes($type, $typeMap);
+        foreach ($nestedTypes as $nestedType) {
+            $typeMap = self::extractTypes($nestedType, $typeMap);
        }

        return $typeMap;
--- a/src/Utils/Utils.php
+++ b/src/Utils/Utils.php
@ -264,8 +264,8 @@ class Utils
        $grouped = [];
        foreach ($traversable as $key => $value) {
            $newKeys = (array) $keyFn($value, $key);
-            foreach ($newKeys as $key) {
-                $grouped[$key][] = $value;
+            foreach ($newKeys as $newKey) {
+                $grouped[$newKey][] = $value;
            }
        }

--- a/src/Validator/Rules/DisableIntrospection.php
+++ b/src/Validator/Rules/DisableIntrospection.php
@ -52,6 +52,6 @@ class DisableIntrospection extends QuerySecurityRule

    protected function isEnabled()
    {
-        return $this->isEnabled !== static::DISABLED;
+        return $this->isEnabled !== self::DISABLED;
    }
 }
--- a/src/Validator/Rules/LoneSchemaDefinition.php
+++ b/src/Validator/Rules/LoneSchemaDefinition.php
@ -32,6 +32,7 @@ class LoneSchemaDefinition extends ValidationRule
            NodeKind::SCHEMA_DEFINITION => static function (SchemaDefinitionNode $node) use ($alreadyDefined, $context, &$schemaDefinitionsCount) {
                if ($alreadyDefined !== false) {
                    $context->reportError(new Error('Cannot define a new schema within a schema extension.', $node));
+
                    return;
                }

--- a/src/Validator/Rules/NoUndefinedVariables.php
+++ b/src/Validator/Rules/NoUndefinedVariables.php
@ -12,8 +12,6 @@ use GraphQL\Validator\ValidationContext;
 use function sprintf;

 /**
- * Class NoUndefinedVariables
- *
 * A GraphQL operation is only valid if all variables encountered, both directly
 * and via fragment spreads, are defined by that operation.
 */
--- a/src/Validator/Rules/QueryComplexity.php
+++ b/src/Validator/Rules/QueryComplexity.php
@ -206,10 +206,12 @@ class QueryComplexity extends QuerySecurityRule
                $directive = Directive::includeDirective();
                /** @var bool $directiveArgsIf */
                $directiveArgsIf = Values::getArgumentValues($directive, $directiveNode, $variableValues)['if'];
+
                return ! $directiveArgsIf;
            }
            $directive       = Directive::skipDirective();
            $directiveArgsIf = Values::getArgumentValues($directive, $directiveNode, $variableValues);
+
            return $directiveArgsIf['if'];
        }
    }
@ -282,6 +284,6 @@ class QueryComplexity extends QuerySecurityRule

    protected function isEnabled()
    {
-        return $this->getMaxQueryComplexity() !== static::DISABLED;
+        return $this->getMaxQueryComplexity() !== self::DISABLED;
    }
 }
--- a/src/Validator/Rules/QueryDepth.php
+++ b/src/Validator/Rules/QueryDepth.php
@ -98,14 +98,12 @@ class QueryDepth extends QuerySecurityRule

    /**
     * Set max query depth. If equal to 0 no check is done. Must be greater or equal to 0.
-     *
-     * @param int $maxQueryDepth
     */
-    public function setMaxQueryDepth($maxQueryDepth)
+    public function setMaxQueryDepth(int $maxQueryDepth)
    {
        $this->checkIfGreaterOrEqualToZero('maxQueryDepth', $maxQueryDepth);

-        $this->maxQueryDepth = (int) $maxQueryDepth;
+        $this->maxQueryDepth = $maxQueryDepth;
    }

    public static function maxQueryDepthErrorMessage($max, $count)
@ -115,6 +113,6 @@ class QueryDepth extends QuerySecurityRule

    protected function isEnabled()
    {
-        return $this->getMaxQueryDepth() !== static::DISABLED;
+        return $this->getMaxQueryDepth() !== self::DISABLED;
    }
 }
--- a/src/Validator/Rules/ValuesOfCorrectType.php
+++ b/src/Validator/Rules/ValuesOfCorrectType.php
@ -49,6 +49,7 @@ class ValuesOfCorrectType extends ValidationRule
    public function getVisitor(ValidationContext $context)
    {
        $fieldName = '';
+
        return [
            NodeKind::FIELD        => [
                'enter' => static function (FieldNode $node) use (&$fieldName) {
@ -281,6 +282,7 @@ class ValuesOfCorrectType extends ValidationRule
                return self::badArgumentValueMessage($typeName, $valueName, $fieldName, $arg->name, $message);
            }
        }
+
        return self::badValueMessage($typeName, $valueName, $message);
    }
 }
--- a/tests/Executor/ExecutorTest.php
+++ b/tests/Executor/ExecutorTest.php
@ -11,6 +11,7 @@ use GraphQL\Executor\Executor;
 use GraphQL\Language\Parser;
 use GraphQL\Tests\Executor\TestClasses\NotSpecial;
 use GraphQL\Tests\Executor\TestClasses\Special;
+use GraphQL\Type\Definition\EnumType;
 use GraphQL\Type\Definition\InputObjectType;
 use GraphQL\Type\Definition\InterfaceType;
 use GraphQL\Type\Definition\ObjectType;
@ -1100,13 +1101,24 @@ class ExecutorTest extends TestCase
                            'f' => ['type' => Type::int(), 'defaultValue' => 'some-string'],
                            'g' => ['type' => Type::boolean()],
                            'h' => [
-                                'type'             => new InputObjectType([
+                                'type' => new InputObjectType([
                                    'name'   => 'ComplexType',
                                    'fields' => [
                                        'a' => ['type' => Type::int()],
                                        'b' => ['type' => Type::string()],
                                    ],
-                                ]), 'defaultValue' => ['a' => 1, 'b' => 'test'],
+                                ]),
+                                'defaultValue' => ['a' => 1, 'b' => 'test'],
+                            ],
+                            'i' => [
+                                'type' => new EnumType([
+                                    'name' => 'EnumType',
+                                    'values' => [
+                                        'VALUE1' => 1,
+                                        'VALUE2' => 2,
+                                    ],
+                                ]),
+                                'defaultValue' => 1,
                            ],
                        ],
                    ],
@ -1117,7 +1129,7 @@ class ExecutorTest extends TestCase
        $query    = Parser::parse('{ field }');
        $result   = Executor::execute($schema, $query);
        $expected = [
-            'data' => ['field' => '{"a":1,"b":null,"c":0,"d":false,"e":"0","f":"some-string","h":{"a":1,"b":"test"}}'],
+            'data' => ['field' => '{"a":1,"b":null,"c":0,"d":false,"e":"0","f":"some-string","h":{"a":1,"b":"test"},"i":1}'],
        ];

        self::assertEquals($expected, $result->toArray());
--- a/tests/Executor/MutationsTest.php
+++ b/tests/Executor/MutationsTest.php
@ -59,6 +59,7 @@ class MutationsTest extends TestCase
            ],
            'name'   => 'NumberHolder',
        ]);
+
        return new Schema([
            'query'    => new ObjectType([
                'fields' => [
--- a/tests/Executor/ResolveTest.php
+++ b/tests/Executor/ResolveTest.php
@ -16,7 +16,6 @@ use function uniqid;
 class ResolveTest extends TestCase
 {
    // Execute: resolve function
-
    /**
     * @see it('default function accesses properties')
     */
--- a/tests/Executor/VariablesTest.php
+++ b/tests/Executor/VariablesTest.php
@ -355,7 +355,6 @@ class VariablesTest extends TestCase
        self::assertEquals($expected, $result->toArray());
    }

-
    // Describe: Handles non-nullable scalars

    /**
--- a/tests/StarWarsIntrospectionTest.php
+++ b/tests/StarWarsIntrospectionTest.php
@ -11,7 +11,6 @@ class StarWarsIntrospectionTest extends TestCase
 {
    // Star Wars Introspection Tests
    // Basic Introspection
-
    /**
     * @see it('Allows querying the schema for types')
     */
--- a/tests/StarWarsValidationTest.php
+++ b/tests/StarWarsValidationTest.php
@ -12,7 +12,6 @@ class StarWarsValidationTest extends TestCase
 {
    // Star Wars Validation Tests
    // Basic Queries
-
    /**
     * @see it('Validates a complex but valid query')
     */
--- a/tests/Utils/BuildSchemaTest.php
+++ b/tests/Utils/BuildSchemaTest.php
@ -24,7 +24,6 @@ use function count;
 class BuildSchemaTest extends TestCase
 {
    // Describe: Schema Builder
-
    /**
     * @see it('can use built schema for limited execution')
     */
--- a/tests/Utils/SchemaExtenderTest.php
+++ b/tests/Utils/SchemaExtenderTest.php
@ -198,6 +198,7 @@ class SchemaExtenderTest extends TestCase

        preg_match('/^[ \t]*/', $trimmedStr, $indentMatch);
        $indent = $indentMatch[0];
+
        return preg_replace('/^' . $indent . '/m', '', $trimmedStr);
    }

@ -210,6 +211,7 @@ class SchemaExtenderTest extends TestCase
        $ast            = Parser::parse($sdl);
        $extendedSchema = SchemaExtender::extend($this->testSchema, $ast, $options);
        self::assertEquals(SchemaPrinter::doPrint($this->testSchema), $originalPrint);
+
        return $extendedSchema;
    }

@ -1250,7 +1252,6 @@ class SchemaExtenderTest extends TestCase
        self::assertEquals('new directive', $newDirective->description);
    }

-
    /**
     * @see it('may extend directives with new complex directive')
     */
@ -1735,7 +1736,6 @@ class SchemaExtenderTest extends TestCase
        self::assertEquals($queryType->name, 'Foo');
    }

-
    /**
     * @see it('adds new root types via schema extension')
     */
@ -1875,7 +1875,6 @@ class SchemaExtenderTest extends TestCase
        }
    }

-
    /**
     * @see it('does not allow defining a root operation type twice')
     */
@ -1964,7 +1963,6 @@ extend type Query {
        self::assertSame(['data' => ['hello' => 'Hello World!']], $result->toArray());
    }

-
    /**
     * @see https://github.com/webonyx/graphql-php/issues/180
     */
--- a/tests/Utils/SchemaPrinterTest.php
+++ b/tests/Utils/SchemaPrinterTest.php
@ -21,7 +21,6 @@ use PHPUnit\Framework\TestCase;
 class SchemaPrinterTest extends TestCase
 {
    // Describe: Type System Printer
-
    /**
     * @see it('Prints String Field')
     */
--- a/tests/Validator/ValuesOfCorrectTypeTest.php
+++ b/tests/Validator/ValuesOfCorrectTypeTest.php
@ -1135,7 +1135,6 @@ class ValuesOfCorrectTypeTest extends ValidatorTestCase
        );
    }

-
    // DESCRIBE: Valid input object value

    /**