Example of DI working in AngularDart.

angularDependencyInjection.dart

// Simple class holding some configuration
class ConfigService{
  String text;
  ConfigService() {
    this.text = "Meep!";
  }
}

@NgDirective(selector: '[sample-text-id]')
class ReverseClickDirective{
  // Second parameter is of type 'ConfigService', so the DI framework knows how to inject it
  ReverseClickDirective(this.element, ConfigService config) {
    element.text = config.text;
    element.onClick.listen(reverseText);
  }
  // ...
}

void main() {
  // Include "ConfigService" in the DI module
  ngBootstrap(module: new Module()
        ..type(ReverseClickDirective)
        ..type(ConfigService));
}