Set up multiple environment such as dev and prod to hold different set of variables

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Did you verify this is a real problem by searching the [NativeScript Forum]

Yes.

Tell us about the problem

How does one achieve the following: https://stackoverflow.com/questions/22995057/how-do-you-manage-multiple-environments-while-developing-android-apps

I hope to have 2 application IDs such as (org.nativescript.scvsmobileappdev & org.nativescript.scvsmobileapp), which eventually will be build to create 2 playstore apps (one for development testing, another one for production). The package.json, app.gradle must be able to generate its value based on environment variables.

I saw from here https://blog.davincisoftware.sk/building-a-mobile-nativescript-app that we can use the CLI hooks to achieve environment variables, but I want the files that is being involved in the app build process such as tns build to be able to read from those environment, maybe something like tns build --dev

Which platform(s) does your issue occur on?

Android

Please provide the following version numbers that your issue occurs with:

• CLI: (run tns --version to fetch it) 4.1.0
• Cross-platform modules: (check the 'version' attribute in the
  node_modules/tns-core-modules/package.json file in your project) 4.1.0
• Runtime(s): (look for the "tns-android" and "tns-ios" properties in the
  package.json file of your project) 4.1.3
• Plugin(s): (look for the version number in the package.json file of your
  project) 4.1.3

從 package.json 和 app.gradle 開始，接著追蹤 tns build 和 CLI hooks 如何參與 Android 建置流程。定義開發環境與生產環境的選擇應如何提供不同的應用程式 ID 和變數，包括是否需要使用類似 tns build --dev 的命令；未提及測試。