Prevent optional dependencies to be installed on Heroku

Question

part of my package.json:

"optionalDependencies": {
  "cypress": "^8.2.0",
  "cypress-commands": "^1.1.0",
  "cypress-expect": "^2.4.1",
  "cypress-file-upload": "^4.1.1"
},

I know that npm install --no-optional prevents optinal dependencies to be installed locally. But no idea how to pass that flag on Heroku

Answer 1

heroku config:set NPM_CONFIG_OMIT=optional

And this is exactly what it's needed for. We don't want heroku spending time and resource loading and building test packages.