Managing large amounts of environment variables

從之前的 issue #4318 以及 build、serve、test 和 e2e 命令的入口點開始。檢視現有的 environments.ts 作法和 webpack.config.js 中的 DefinePlugin 範例，然後確定應如何將匯出的變數或 .env 檔案公開為 process.env.VARIABLE。當這些命令支援的行為和範圍都已定義時，即視為完成。

Command

build, serve, test, e2e

Description

I am reopening https://github.com/angular/angular-cli/issues/4318.

Essentially we need a way to pass environment variables to the build/serve commands. environments.ts file is not a viable solution as you would need to end up with hundreds of environment.ts files depending on all the permutations per environment.

The solution to https://github.com/angular/angular-cli/issues/4318 also does not address this since you need to know the define values when running the command ng build <define> <define> <define>....
Which means you would have to generate the build command same way as generating the environment.ts file.

Most enterprise angular applications I have worked on ends up extending the webpack.config.js file adding:

DefinePlugin({
  process: {
    env: {
      VAR_1: JSON.stringify(process.env.VAR_1),
      ...
    }
  }
})

This issue has been brought up for years with the Angular repo but i've never seen a resolution so I want to try to make it as clear as possible.
We should support a dotenv() style solution where in the code we can use process.env.VARIABLE.
In the build machine we can either:
export VARIABLE=test
or have a .env file to pick it up.

This is supported by pretty much every other framework out there so I'm not sure why it wouldn't be possible or hasn't already been implemented.

If the issue is the angular team doesn't want this behaviour then that is fine but I am looking for a yes/no type answer. If the answer is no the angular team would be able to point to this issue for all future feature requests of this nature.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response