index.js

const {gql} = require('apollo-server');
 const typeDefs = gql`
    extend type Query {
        author(id: ID!): Author
        authors: [Author]
    }
     type Author {
        id: ID!
        name: String
        surname: String
    }
`;
 const resolvers = {
    Query: {
        author(_, {id}) {
            return {
                id,
                name: 'Daniele',
                surname: 'Zurico'
            }
        },
        authors() {
            return [
                {
                    id: Math.round(Math.random() * 100000),
                    name: 'Daniele',
                    surname: 'Zurico',
                },
                {
                    id: Math.round(Math.random() * 100000),
                    name: 'Alex',
                    surname: 'Michaels',
                }
            ]
        }
    }
};
 module.exports = {
    typeDefs,
    resolvers
}