Create-react-app: Support custom .env file

[vegawong]

Describe the solution you'd like

New cra support .env file as .env and .env.{NODE_ENV}。Many times need to use other custom environments such as .env.qa, .env.pre an so on. Would CRA consider supporting this feature in the after-process?

I suggest that we refer to vue-cli to support --mode option, and it should be optional. When the mode option is exist, it would be replace NODE_ENV variable to load the .env file as .env.{mode}.

[PupoSDC]

In case you are looking for a workaround, in our project we use env-cmd:

"scripts": {
    "start": "env-cmd -f .env.dev react-scripts start",
    "build:prod": "env-cmd -f .env.prod react-scripts build",
    "build:dev": "env-cmd -f .env.dev react-scripts build",
  },

[vegawong]

@PupoSDC Thanks, does it also merge with .env file?

[ali-master]

I had your problem and I've used the env-cmd and the Result will be merged with .env file. But I agree with you to use something like --mode flag.

[vegawong]

I also hope to support --mode flag.