GraphQL on Firebase

index.js

/* @flow */
import * as functions from 'firebase-functions'
import express from 'express'
import Cors from 'cors'
import { graphqlExpress } from 'apollo-server-express'
import bodyParser from 'body-parser'
import { makeExecutableSchema } from 'graphql-tools'

const schema = makeExecutableSchema({typeDefs: [/* Your schema.graphql */], resolvers: {/* Your resolver */} })
const cors = Cors({ origin: true })

const server = express().use(
  cors,
  bodyParser.json(),
  graphqlExpress({ schema, context: {} })
)

export const graphql = functions.https.onRequest(server)