Dart: How to use different settings in debug and production mode?

this works since a short while:

transformers: # or dev_transformers
- $dart2js:
  environment: { PROD: "true" }

access it from the code like

String.fromEnvironment()

main() {
  print('PROD: ${const String.fromEnvironment('PROD')}'); 
  // works in the browser
  // prints 'PROD: null' in Dartium
  // prints 'PROD: true' in Chrome
}

see also

• Configuring the Built-in dart2js Transformer
• How to achieve precompiler directive like functionality
• https://github.com/dart-lang/pub/issues/798
• http://blog.sethladd.com/2013/12/compile-time-dead-code-elimination-with.html
• https://api.dartlang.org/stable/1.22.0/dart-core/bool/bool.fromEnvironment.html
• dart check if is building