Modular GraphQL schema code

An example of Modularize GraphQL schema structure based on this blog post.

GraphQL typeDefs and resolver should be collocated in one file.

Example from author.js

export const typeDef = `
  # We extend the type Query so that we can use #them in to individual js file.
  extend type Query {
    author(id: Int!): Author
  }

  type Author {
    id: Int!
    firstName: String
    lastName: String
    books: [Book]
  }
`;

export const resolvers = {
  Query: {
    author: () => {...},
  },
  Author: {
    books: () => [...],
  },
};

In your schemas/index.js you could do consolidate all the resolvers and typeDefs in your schema.

import { gql } from 'apollo-server';
import merge from 'lodash.merge';
import { typeDef as Author, resolvers as authorResolvers } from './author';
import { typeDef as Book, resolvers as bookResolvers } from './book';

const Query = gql`
  type Query {
    _empty: String
  }
`;

export const typeDefs = [Query, Author, Book];

export const resolvers = merge(authorResolvers, bookResolvers);

Credits to Dhaivat Pandya