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gql-dart/gql

This is an effort to advance the Dart GraphQL ecosystem.

It consists of multiple packages and libraries centered around GraphQL AST.

Core

The core of this project is the GraphQL parser which parses GraphQL strings into an AST. The parsed AST can then be transformed, visited and printed back to GraphQL string.

Pub	Package	Library	Description
	package:gql	ast.dart	GraphQL AST implementation with Visitor pattern and AST transformer
	package:gql	language.dart	GraphQL source parser and printer. Recognizes both operations and SDL
	package:gql	document.dart	Document and schema validation

Code generation

GraphQL language enables code generation to speed up development and move document processing to build-time.

We provide code builders to generate Dart source code and file builders which easily plug into standard Dart code generation pipeline.

Ideas for future work:

• Typed resolvers for field resolution on the client or server

Pub	Package	Library	Description
	package:gql_code_builder		Various builders
	package:gql_build		File builders

Client

To enable development of GraphQL clients, we provide type definitions used to execute GraphQL operations. They include AST-based operation, request with per operation context, and response. These types are used by the Links.

Link is the current client implementation. Link is GraphQL AST-aware request/response middleware. They can be used to build a pipeline to deduplicate requests, conditionally transform requests and responses (including the context), and eventually send the requests to the server.

Ideas for future work:

• websocket link for subscriptions
• batched request HTTP link
• retry link to handle network issues transparently
• link for client-side request resolution

Pub	Package	Library	Description
	package:gql_exec	gql_exec.dart	Implementation of types for GraphQL requests and responses
	package:gql_link	link.dart	Base for modular GraphQL execution interface
	package:gql_http_link	gql_http_link.dart	Link to execute GraphQL requests via HTTP
	package:gql_dedupe_link	gql_dedupe_link.dart	De-duplicating Link to avoid execution of identical requests
	package:gql_transform_link	gql_transform_link.dart	GQL Link to transform Requests and Responses. May be used to update context, document, variables, data, errors, etc.
	package:gql_websocket_link	gql_websocket_link.dart	GQL Link for subscriptions using websocket.
	package:gql_dio_link	gql_dio_link.dart	Similar to gql_http_link, A GQL Terminating Link to execute requests via Dio using JSON.

Other

Pub	Package	Library	Description
	package:gql_pedantic		Lint rules used by all gql-dart/gql packages

Examples

Pub	Package	Library	Description
	package:gql_example_cli		Example usage in a CLI environment
	package:gql_example_flutter		Example usage in a Flutter environment

Users

Contributing

The goal of this project is to expand Dart GraphQL ecosystem and to build a community around this vendor-neutral implementation.

Community contributions are welcome.

multipack

This repo uses multipack. To activate it run the following command.

pub global activate multipack

multipack provides a simple way of running commands in multiple packages at once. It builds a directed graph of packages to run commands in topological order.

Link all local packages by running

multipack pubspec override

Get all packages by running

multipack pub get

Clean up the pubspec file before publishing

multipack pubspec clean

See more usage examples in .github/workflows/dart.yml.

Features and bugs

Please file feature requests and bugs at the GitHub.