index.js

const { ApolloServer, gql } = require("apollo-server");
const { RESTDataSource } = require("apollo-datasource-rest");

class RandomCard extends RESTDataSource {
  constructor() {
    super();
    this.baseURL = "https://rws-cards-api.herokuapp.com/api/v1/cards";
  }

  async getCard() {
    const card = await this.get("/");

    return card.cards[0];
  }

  async getRandomCards(num) {
    const card = await this.get(`/random?n=${num}`);

    return card.cards;
  }
}

module.exports = RandomCard;

// Construct a schema, using GraphQL schema language
const typeDefs = gql`
  type Card {
    num: String
    name: String
    desc: String
    meaning_up: String
    meaning_down: String
    suit: String
    type: String
  }
  type Query {
    getCard: Card
    getRandomCards(num: String!): [Card]
  }
`;

// Provide resolver functions for your schema fields
const resolvers = {
  Query: {
    getCard: async (_, __, { dataSources }) => dataSources.RandomCard.getCard(),
    getRandomCards: async (_, { num }, { dataSources }) => {
      return dataSources.RandomCard.getRandomCards(num);
    }
  }
};

const server = new ApolloServer({
  typeDefs,
  resolvers,
  dataSources: () => ({
    RandomCard: new RandomCard()
  })
});

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});