linearregression / apollo-codegen

:pencil2: Generate API code or type annotations based on a GraphQL schema and query documents

Apollo GraphQL code generator

This is a tool to generate API code or type annotations based on a GraphQL schema and query documents.

It currently generates Swift code, TypeScript annotations and Flow annotations, we hope to add support for other targets in the future.

See Apollo iOS for details on the mapping from GraphQL results to Swift types, as well as runtime support for executing queries and mutations.

Usage

If you want to experiment with the tool, you can install the apollo-codegen command globally:

npm install -g apollo-codegen

To download a GraphQL schema by sending an introspection query to a server:

apollo-codegen download-schema http://localhost:8080/graphql --output schema.json

You can use the header option to add additional HTTP headers to the request. For example, to include an authentication token, use --header "Authorization: Bearer <token>".

This tool will generate Swift code by default from a set of query definitions in .graphql files:

apollo-codegen generate **/*.graphql --schema schema.json --output API.swift

You can also generate type annotations for TypeScript or Flow using the --target option:

# TypeScript
apollo-codegen generate **/*.graphql --schema schema.json --target typescript --output schema.ts
# Flow
apollo-codegen generate **/*.graphql --schema schema.json --target flow --output schema.flow.js

Contributing

Running tests locally:

npm install
npm test