graphql-schema-modules 

Modularize and decouple GraphQL schema and resolvers.

Installation

``sh
$ npm install --save graphql-schema-modules
`

Features

* Keep different query/mutation/subscription definitions in separate files
* Keep resolvers and GraphQL definitions modularized
* Load GraphQL from directory

Usage

graphql/shared.js
`js
export const typeDefs =
enum UserType { MEMBER, ADMIN }

type schema {
query: Query
mutation: Mutation
}
;
`

graphql/users.js
`js
export const typeDefs =
type User {
id: Int!
type: UserType!
}

input UserInput {
type: UserType!
}

input UserFilters {
type: UserType
}

type Query {
user: User!
users (filters: UserFilters = {}): [User!]!
}
type Mutation {
userCreate (input: UserInput!): User!
}
;

export const resolvers = {
Query: {
async user () {
return { id: 1, type: 'MEMBER' };
},
async users () {
return [];
},
},
Mutation: {
async userCreate () {
return { id: 1, type: 'MEMBER' };
},
},
};

`

graphql/posts.js
`js
export const typeDefs =
type Post {
id: Int!
title: String!
}

input PostInput {
title: String!
}

type Mutation {
postCreate (input: PostInput!): Post!
}

type Query {
posts: [Post!]!
}
;

export const resolvers = {
Mutation: {
async postCreate () {
return { id: 1, title: 'Post1' };
},
},
Query: {
async posts () {
return [];
},
},
};
`

buildSchema.js
`js
import { mergeModules, loadModules } from 'graphql-schema-modules';
import { makeExecutableSchema } from 'graphql-tools';
import * as shared from './graphql/shared.js';
import * as posts from './graphql/posts.js';
import * as users from './graphql/users.js';

const { typeDefs, resolvers } = mergeModules([ shared, posts, users ]);
// OR
// const { typeDefs, resolvers } = loadModules(__dirname + '/graphql');

console.log(typeDefs[0]);

const schema = makeExecutableSchema({ typeDefs, resolvers });

export default schema;
`

The output will be:

`graphql
type Post {
id: Int!
title: String!
}

input PostInput {
title: String!
}

This is where magic happens - mutations are merged

input UserFilters {
type: UserType
}
``