Probot on Now.sh v2

now.json

{
  "version": 2,
  "builds": [
    { "src": "probot.js", "use": "@now/node" }
  ],
  "env": {
    "GITHUB_TOKEN": "@github-token",
    "APP_ID": "@app-id",
    "PRIVATE_KEY": "@private-key-base64"
  },
  "routes": [
    { "src": "/probot/.*", "dest": "probot.js" }
  ]
}

probot.js

const { createProbot } = require('probot')

const loadProbot = appFn => {
  const probot = createProbot({
    id: process.env.APP_ID,
    cert: Buffer.from(process.env.PRIVATE_KEY, 'base64')
  })

  probot.load(appFn)

  return probot
}

const appFn = (app) => {
  const router = app.route('/probot')
  
  router.get('/test', (req, res) => {
    res.send('hi from probot!!!')
  })
}

module.exports = (req, res) => {
    const probot = loadProbot(appFn)
    return probot.server(req, res)
}

Note, I had to explicitly add:

  const probot = createProbot({
    id: process.env.APP_ID,
+   secret: process.env.GITHUB_TOKEN,
    cert: Buffer.from(process.env.PRIVATE_KEY, 'base64')
  })