How to change NODE_ENV in WEB versions of Heroku?

Question

JavaScript

How to change NPM_CONFIG_PRODUCTION=false
What if on build, Heroku would install packages from DevDependencies ?
And then when building, it swears that there is no webpack-dev-server`a
Off. Heroku documentation found such code.
heroku config:set NPM_CONFIG_PRODUCTION=false YARN_PRODUCTION=false
But how to do it in Heroku web?

Answer 1

Settings -> config vars