injection in a Dart singleton with angular2
In my opinion this is the wrong approach in Angular. Angular DI provides singletons by itself.
class Singleton { final LoggerService log; Singleton(this.log);}bootstrap(AppComponent, [LoggerService, Singleton]);should do what you want. As long as you don't add Singleton to providers elsewhere (for example on a component) Angular2 will always inject the same instance.
If you still want to keep above pattern, use
bootstrap(AppComponent, [ LoggerService, provide(Singleton, useFactory: (log) => new Singleton(log), deps: [LoggerService])]);