Handling with both Google Cloud Functions and Express

function.js

exports.hello = require('./hello');

hello.js

module.exports = function hello(req, res) {
    res.send('Hello');
}

package.json

{
  "name": "functions-with-express",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Mateusz Haligowski",
  "license": "ISC",
  "dependencies": {
    "express": "^4.15.2"
  }
}

server.js

var express = require('express');
var app = express();

var hello = require('./hello.js');

app.get('/hello', hello);

app.listen(3000, function() {
    console.log('Listening...');
});