serverless.js

  User: {
    tweets: obj =>
      knex
        .select('*')
        .from('Tweets')
        .leftJoin('Users', 'Tweets.user_id', 'Users.user_id')
        .where('handle', obj.handle)
        .then(posts => {
          if (!posts) {
            throw new Error('User not found');
          }

          tweets = { items: posts };

          return tweets;
        }),
  },