[Feature request] Support Zeit Now v2 lambda

First of all I’d like to thank you for this awesome project!

I’d like to ask you to support Now v2 lambdas. Their lambdas have a different signature than AWS. It’s like this (more info here):

const { parse } = require('url')

module.exports = (req, res) => {
  const { query } = parse(req.url, true)
  const { name = 'World' } = query
  res.end(`Hello ${name}!`)
}

It seems for me that returning “app” at this point and just exporting as module.exports would do the job. https://github.com/prisma/graphql-yoga/blob/master/src/index.ts#L351

The idea is to create another function on the server, maybe createExpressApp or something that would return the configured express server and receive the same Options as createHttpServer receives. This function would be used on createHttpServer up to the line 351.

I’ll submit a PR for it later. Thanks 👍

[lucasavila00]

Use my fork if you want: I use it on production and it works fine https://github.com/lucasavila00/graphql-yoga/ https://www.npmjs.com/package/graphql-yoga-dgt

Usage:

// src/index.ts
import { GraphQLServer } from "graphql-yoga-dgt";
import resolvers from "./resolvers";
import options from "./options";

const server = new GraphQLServer({
  typeDefs: "/schema.graphql",
  resolvers: resolvers,
});

// same options as server.createHttpServer receives
module.exports = server.createExpressApplication(options);

// now.json
{
  "version": 2,
  "builds": [
    {
      "src": "/src/index.ts",
      "use": "@now/node"
    }
  ],
  "routes": [
    { "src": "/api", "dest": "/src/index.ts" }
  ]
}

If any mantainer likes this approach feel free to implement this or ping me for a PR

[TheDSCPL]

@lucasavila00 Conseguiu pôr isto a funcionar?