ConfigurationPropertySource mixin

A mixin that provides access to a globally attached Environment.

This is typically used by configuration classes that need to resolve properties without explicitly passing around the Environment instance.

The environment must first be attached with attach before attempting to access it through the environment getter.

Example:

void main() {
  final env = Environment();
  ConfigurationPropertySource.attach(env);

  final config = MyConfig(); // uses ConfigurationPropertySource
  print(config.environment.getProperty("app.name"));
}

⚠️ If environment is accessed before calling attach, an error will be thrown.