package.json start script, babel-node: not found on heroku deploy

You have to include the dependency in you package.json so it will install it when you deploy.

$ npm install babel-cli -S

Than you have to change you start command to be like:

"start": "babel-node index.js"

See here for more info on deploying babel on heroku.com.

Warning: using babel-node is not recommended in production

Specifically, include the necessary dependency under 'dependencies' and not 'devDependencies' in your 'package.json file'. This is because Heroku prunes (removes) your 'devDependencies' once it completes its build process, leaving only the 'dependencies', to keep the app as lean as possible.

This causes errors if you've built your NodeJS app using ES6 modules and included the necessary dependencies under 'devDependencies' instead of 'dependencies', namely the '@babel/' family of dependencies.

Update

You should always build your NodeJS App before you deploy it so that you are always running the production build in the live environment which executes much faster with fewer resources.

I got the same issue, but I think set NPM_CONFIG_PRODUCTION=false to install devDependencies will be better. I used below command:

heroku config:set NPM_CONFIG_PRODUCTION=false