Firebase Cloud Functions GraphQL

index.ts

import { https } from "firebase-functions";
import * as express from "express";
import { ApolloServer, gql } from "apollo-server-express";

const typeDefs = gql`
  # Comments in GraphQL strings (such as this one) start with the hash (#) symbol.

  # This "Book" type defines the queryable fields for every book in our data source.
  type Book {
    title: String
    author: String
  }

  # The "Query" type is special: it lists all of the available queries that
  # clients can execute, along with the return type for each. In this
  # case, the "books" query returns an array of zero or more Books (defined above).
  type Query {
    books: [Book]
  }
`;
const books = [
  {
    title: "Harry Potter and the Chamber of Secrets",
    author: "J.K. Rowling",
  },
  {
    title: "Jurassic Park",
    author: "Michael Crichton",
  },
];
const resolvers = {
  Query: {
    books: () => books,
  },
};

const server = new ApolloServer({ typeDefs, resolvers });
const app = express();
server.applyMiddleware({ app });

// https://github.com/arjunyel/firestore-apollo-graphql
// ex. /api/graphql?query={books{title%20author}}

export const api = https.onRequest(app);

export const helloWorld = https.onRequest((request, response) => {
  request;
  response.send("Hello from Firebase!");
});