SSR React on Google Cloud Functions

index.js

const next = require('next')

const app = next({ dev: false })
const handle = app.getRequestHandler()

const slasher = handler => (req, res) => {
  if (req.url === '') {
    req.url = '/'
  }

  return handler(req, res)
}

module.exports.handler = slasher((req, res) => {
  return app.prepare()
    .then(() => handle(req, res))
    .catch(ex => {
      console.error(ex.stack)
      process.exit(1)
    })
})