mandatory fields

schema.js

import {makeExecutableSchema, addMockFunctionsToSchema} from 'graphql-tools';
import resolvers from './resolvers'


const typeDefs = `
  type Author {
    id: Int,
    age: Int
    name: String,
    Books: [String]
  }

  type Query {
    authors: [Author]
    author(id: Int): Author
  }

  type Mutation {
    addAuthor(name: String!, age: Int!, Books: [String]!): Author
  }
`;

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

export default schema;