Nest.js deployment to now.sh

Question

I am currently trying to deploy my demo application to zeit now.sh. In documentation I have found how I can deploy Node.js and Express.js application. But example that I am referring expects as parameter js file with server initialization, and by default Nest.js project has as entry point ts file. Whole application is written in typescript. If I try to use main.ts as entry point, I am getting this error:

11/28 08:05 PM (1m)

{ Error: Cannot find module './app.module'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/var/task/user/src/main.ts:26040:18)
    at __webpack_require__ (/var/task/user/src/main.ts:21:30)
    at Module.module.exports.Object.defineProperty.value (/var/task/user/src/main.ts:26050:69)
    at __webpack_require__ (/var/task/user/src/main.ts:21:30)
    at module.exports.Object.setPrototypeOf.__proto__ (/var/task/user/src/main.ts:85:18)
    at Object.<anonymous> (/var/task/user/src/main.ts:88:10) code: 'MODULE_NOT_FOUND' }

11/28 08:05 PM (1m)

Error while initializing entrypoint: { Error: Cannot find module './app.module'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/var/task/user/src/main.ts:26040:18)
    at __webpack_require__ (/var/task/user/src/main.ts:21:30)
    at Module.module.exports.Object.defineProperty.value (/var/task/user/src/main.ts:26050:69)
    at __webpack_require__ (/var/task/user/src/main.ts:21:30)
    at module.exports.Object.setPrototypeOf.__proto__ (/var/task/user/src/main.ts:85:18)
    at Object.<anonymous> (/var/task/user/src/main.ts:88:10) code: 'MODULE_NOT_FOUND' }

Is there anybody that have experience with deployment of Nest.js app to now.sh?

Answer 1

When you deploy your application, you should always transpile it to javascript first (regardless of now).

1) Add the file now.json to your project root directory:

{
  "version": 2,
  "builds": [
    {
      "src": "dist/main.js",
      "use": "@now/node-server"
    }
  ],
  "routes": [
    {
      "src": "/(.*)",
      "dest": "dist/main.js"
    }
  ]
}

2) Run npm run build to compile your project to the dist folder

3) Run now (the cli) to deploy your project