resolvers.js

const db = require('./database');

const Query = {
    users: () => db.users.list(),
    user: (root, { id }) => db.users.get(id),
    tweets: (root, { userId, last }) => {
        const tweets = db.tweets.list().filter(tweet => tweet.userId === userId);
        return last ? tweets.slice(-last) : tweets;
    }
};

module.exports = { Query };