GraphQL Printer

The package allows you to print GraphQL Schema and Queries in a highly customized way eg you can choose indent size, print only used/wanted/all types, print only one type, print used/wanted/all directives (it is not possible with standard printer) and even check which types/directives are used in the Schema/Query.

Requirements

Installation

composer require lastdragon-ru/graphql-printer

Usage

There are two primary methods: Printer::print() and Printer::export(). The print() will print the current type only, meanwhile export() will print the current type and all used types/directives:

<?php declare(strict_types = 1);

use GraphQL\Utils\BuildSchema;
use LastDragon_ru\GraphQL\Printer\Printer;
use LastDragon_ru\GraphQL\Printer\Settings\DefaultSettings;
use LastDragon_ru\LaraASP\Dev\App\Example;

$schema   = BuildSchema::build(
    <<<'GRAPHQL'
    type Query {
        a: A
    }

    type A @a {
        id: ID!
        b: [B!]
    }

    type B @b {
        id: ID!
    }

    directive @a on OBJECT
    directive @b on OBJECT
    GRAPHQL,
);
$type     = $schema->getType('A');
$settings = new DefaultSettings();
$printer  = new Printer($settings, null, $schema);

assert($type !== null);

Example::raw($printer->print($type), 'graphql');
Example::raw($printer->export($type), 'graphql');

The $printer->print($type) is:

type A
@a
{
    b: [B!]
    id: ID!
}

The $printer->export($type) is:

type A
@a
{
    b: [B!]
    id: ID!
}

directive @a
on
    | OBJECT

directive @b
on
    | OBJECT

type B
@b
{
    id: ID!
}

Customization

Please see:

• Settings directory to see built-in settings;
• Settings interface to see all supported settings;
• DirectiveResolver interface to define your own way to find all available directives and their definitions;

Filtering

[!NOTE]

By default, built-in/internal type/directives are not printed, if you want/need them, you should allow them by type/directive definitions filters.

The Printer allows filter out types and directives. This may be useful to exclude them from the schema completely. Filtering also works for queries. Please note that types filtering will work only if the schema is known (the schema is required to determine the type of argument nodes). For some AST node types, their type may also be required.

<?php declare(strict_types = 1);

use GraphQL\Language\Parser;
use GraphQL\Utils\BuildSchema;
use LastDragon_ru\GraphQL\Printer\Contracts\DirectiveFilter;
use LastDragon_ru\GraphQL\Printer\Contracts\TypeFilter;
use LastDragon_ru\GraphQL\Printer\Printer;
use LastDragon_ru\GraphQL\Printer\Settings\DefaultSettings;
use LastDragon_ru\LaraASP\Dev\App\Example;

$typeFilter      = new class() implements TypeFilter {
    #[Override]
    public function isAllowedType(string $type, bool $isStandard): bool {
        return $type !== 'Forbidden';
    }
};
$directiveFilter = new class() implements DirectiveFilter {
    #[Override]
    public function isAllowedDirective(string $directive, bool $isStandard): bool {
        return $directive !== 'forbidden';
    }
};

$schema = BuildSchema::build(
    <<<'GRAPHQL'
    type Query {
        allowed: Boolean @forbidden @allowed
        forbidden: Forbidden
    }

    type Forbidden {
        id: ID!
    }

    directive @allowed on FIELD_DEFINITION
    directive @forbidden on FIELD_DEFINITION
    GRAPHQL,
);
$query  = Parser::parse(
    <<<'GRAPHQL'
    query {
        allowed
        forbidden {
            id
        }
    }
    GRAPHQL,
);

$settings = (new DefaultSettings())
    ->setDirectiveFilter($directiveFilter)
    ->setTypeFilter($typeFilter);
$printer  = new Printer($settings, null, $schema);

Example::raw($printer->print($schema), 'graphql');
Example::raw($printer->print($query), 'graphql');

The $printer->print($schema) is:

directive @allowed
on
    | FIELD_DEFINITION

type Query {
    allowed: Boolean
    @allowed
}

The $printer->print($query) is:

query {
    allowed
}

Laravel/Lighthouse

It is highly recommended to use lastdragon-ru/lara-asp-graphql package to use the Printer within the Laravel/Lighthouse application.

Testing Assertions

There are also a few useful assertions for PHPUnit to check printed/exported type/queries, please see the lastdragon-ru/phpunit-graphql package.

Upgrading

Please follow Upgrade Guide.

Migration from lastdragon-ru/lara-asp-graphql-printer

• Use lastdragon-ru/graphql-printer instead of lastdragon-ru/lara-asp-graphql-printer in composer.json
• Use lastdragon-ru/phpunit-graphql package if you use PHPUnit assertions.
• Use LastDragon_ru\GraphQL\Printer\* instead of LastDragon_ru\LaraASP\GraphQLPrinter\* in code.

Contributing

Please use the main repository to report issues, send pull requests, or ask questions.