graphql-yoga

index.js

import {GraphQLServer} from "graphql-yoga";
import db from './db';
import Query from './resolvers/Query'
import Mutation from './resolvers/Mutation'
import User from './resolvers/User'
import Post from './resolvers/Post'
import Comment from './resolvers/Comment'
/*
const fs = require('fs');
const typeDefs = fs.readFileSync('./src/schema.graphqls','utf8');
*/

const server = new GraphQLServer({
    typeDefs: './src/schema.graphqls',
    resolvers: {
        Query,
        Mutation,
        User,
        Post,
        Comment
    },
    context: {
        db
    }
});

server.start(() => {
    console.log('the server is up');
});

schema.graphqls

schema {
    query: Query
    mutation: Mutation
}

type Query {
    users(query: String): [User!]!
    posts(query: String): [Post!]!
    comments: [Comment!]!
    me: User!
    post: Post!
}

type Mutation {
    createUser(data: CreateUserInput!): User!
    deleteUser(id: ID!): User!
    updateUser(id: ID!, data: UpdateUserInput!): User!
    createPost(data: CreatePostInput!): Post!
    deletePost(id: ID!): Post!
    updatePost(id: ID!, data: UpdatePostInput!): Post!
    createComment(data: CreateCommentInput!): Comment!
    deleteComment(id: ID!): Comment!
    updateComment(id: ID!, data: UpdateCommentInput!): Comment!
}

input CreateUserInput {
    name: String!
    email: String!
    age: Int
}

input UpdateUserInput {
    name: String
    email: String
    age: Int
}

input CreatePostInput {
    title: String!
    body: String!
    published: Boolean!
    author: ID!
}

input UpdatePostInput {
    title: String
    body: String
    published: Boolean
}

input CreateCommentInput {
    text: String!
    author: ID!
    post: ID!
}

input UpdateCommentInput {
    text: String
}

type User {
    id: ID!
    name: String!
    email: String!
    age: Int
    posts: [Post!]!
    comments: [Comment!]!
}

type Post {
    id: ID!
    title: String!
    body: String!
    published: Boolean!
    author: User!
    comments: [Comment!]!
}

type Comment {
    id: ID!
    text: String!
    author: User!
    post: Post!
}