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Note: Initially I thought this was an issue but it turns out it's working as expected -- so I updated it as a feature request.

• Given main.dart:

  void main(List<String> args) {
    print(String.fromEnvironment('name', defaultValue: 'null'));
  }
  

• Running the following:

  # 1-  does not work
  dart run --define name=osaxma bin/main.dart 
  dart run --define "name=osaxma" bin/main.dart 
  
  # 2- does work
  dart run --define=name=osaxma bin/main.dart
  dart run --define="name=osaxma" bin/main.dart 
  
  # 3- does not work
  dart run -D name=osaxma bin/main.dart 
  dart run -D "name=osaxma" bin/main.dart 
  
  # 4- does work when no space between flag and variable
  dart run -Dname=osaxma bin/main.dart 
  dart run -D"name=osaxma" bin/main.dart 
  

• Result:

  null
  null
  
  osaxma
  osaxma
  
  null
  null
  
  osaxma
  osaxma
  

It'd be nice if case 1 & 3 worked. Especially case 3 because -Dname looks unfamiliar and unexpected (at least for the CLIs that I'm used to).

Version: Dart SDK version: 2.18.1 (stable) (Tue Sep 13 11:42:55 2022 +0200) on "macos_x64"