Version: legacy

Development Environment


GraphQL Modules always supports the latest TypeScript version. Lower versions are not supported!

TS-Node (recommended way)

To set up your development environment easily, we recommend to use TypeScript.

You don't have to use TypeScript, but it makes it much easier to use GraphQL Modules.

To get started with your development environment, install the following tools in your project:

yarn add -D ts-node typescript nodemon

Next, create/update tsconfig.json in your root directory:

"compilerOptions": {
"experimentalDecorators": true,
"module": "commonjs",
"target": "es6",
"lib": ["es6", "esnext", "es2015"],
"noImplicitAny": false,
"suppressImplicitAnyIndexErrors": true,
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"sourceMap": true,
"declaration": true,
"outDir": "./dist",
"rootDir": "./src"
"include": ["src/**/*.ts"],
"files": ["src/index.ts"],
"exclude": ["node_modules"]

These configurations facilitate development, but of course you can modify them as you wish. Keep particularly in mind to keep experimentalDecorators: true because that's important for GraphQL Modules.

Next, add the following scripts to your package.json:

"scripts": {
"dev": "nodemon --exec ts-node src/main.ts",
"debug": "nodemon --exec node -r ts-node/register --inspect src/index.ts",
"build": "tsc",
"start": "node dist/index.js"
  • dev starts your server in the development mode.
  • debug starts the server in the debug mode.
  • build uses the tsc compiler to compile your code to JavaScript.
  • start runs the compiled server using pure Node.


TypeScript has an aliasing mechanism for working with modules directories.

To set it up quickly with GraphQL Modules, first add the following package to your server:

yarn add tsconfig-paths

Then update your scripts to load the require extension for TypeScript paths:

"scripts": {
"dev": "nodemon --exec ts-node -r tsconfig-paths/register src/main.ts",
"debug": "nodemon --exec ts-node -r tsconfig-paths/register --inspect --debug-brk src/index.ts",
"build": "tsc",
"start": "node dist/index.js"

And you can add custom mapping to your tsconfig.json file:

"compilerOptions": {
"baseUrl": ".",
"paths": {
"@modules/*": ["./modules/*"]

You can now import files between modules like below:

import { SomeProvider } from '@modules/my-module';

Import from .graphql files

You can also treat .graphql files as text files and import from them easily. It's useful because many IDEs detect .graphql files and do syntax highlighting for them.

You can use graphql-import-node to enable NodeJS to import .graphql files:

yarn add graphql-import-node
import 'graphql-import-node'; // You should add this at the begininng of your entry file.
import * as UserTypeDefs from './user.graphql';


If you are using Webpack, we recommend to use ts-loader or awesome-typescript-loader to load your TypeScript files.

To load .graphql files, you can use graphql-tag/loader.

Here is a simple webpack.config.js that should do the job:

module.exports = {
mode: 'development',
devtool: 'inline-source-map',
entry: './src/index.ts',
output: {
filename: 'dist/server.js',
resolve: {
// Add `.ts` and `.tsx` as a resolvable extension
extensions: ['.ts', '.tsx', '.js', '.graphql'],
plugins: [new TsconfigPathsPlugin()],
module: {
rules: [
{ test: /\.tsx?$/, loader: 'ts-loader' },
test: /\.(graphql|gql)$/,
exclude: /node_modules/,
loader: 'graphql-tag/loader',


You can use Babel for TypeScript with GraphQL Modules by using TypeScript-Babel-Starter.

Still, if you use dependency injection, you have to decorate each property and argument in the providers manually even for the classes like below;

import { Injectable, Inject } from '@graphql-modules/di';
export class SomeProvider {
constructor(@Inject(OtherProvider) private otherProvider: OtherProvider) {}

JavaScript Usage

If you are using JavaScript (not TypeScript) in your project, you can either add support for TypeScript or use GraphQL Modules with the JavaScript API.

With Babel

If you are using Babel to transpile your JavaScript files, you can use babel-plugin-transform-decorators to get decorators support, which enables using decorators such as @Inject in a regular way.

Without decorators

Dependency Injection

You can use Inject and Injectable as regular functions to wrap your arguments and classes from tslib.

Take care to add the polyfill reflect-metadata and require it (once).

Inject(AProvider)(MyProvider, undefined, 0); // inject AProvider to the first MyProvider constructor argument
Inject(ModuleConfig)(MyProvider, undefined, 0); // inject SimpleModule Config to the second MyProvider constructor argument
module.exports = Injectable({...})(MyProvider);

Testing Environment

We recommend Jest as your test runner: it has a simple API, it's super fast and you can integrate it with any CI tools.


To test your GraphQL Modules server with Jest, first add support for TypeScript to your Jest instance:

yarn add -D jest @types/jest ts-jest

Then, add the following section to your package.json:

"jest": {
"transform": {
"^.+\\.tsx?$": "ts-jest"
"testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
"moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json", "node"]

And add a script to your package.json:

"scripts": {
"test": "jest"

Also, make sure that each one of your spec files starts with:

import 'reflect-metadata';

Other Test Runners

You can use any other test runner you prefer. Just figure out how to use it with TypeScript and make sure you can import CommonJS easily.