How to manually annotate an imported class (in angular2)?

[Andreas Grimm]

I have some dependency-free business logic (ES6) classes that I want the Injector to make instances off of.

After having these classes imported (via ES6 import statement), how can I make them "injectable"?

I'm not able to decorate them with `@Injectable()` because these classes must stay dependency-free POJOs.

Here's an example:

```

import { Car, Engine } from 'my-externally-loaded-package';

require('reflect-metadata');  // runs on node.js

let ng = require('angular2/core');  // runs on node.js

// here I'd need to tell angular2-DI that Car needs deps injected

let providers = [

  ng.provide(Engine, { useClass: Engine }),

  ng.provide(Car, { useClass: Car })

];

let injector = ng.Injector.resolveAndCreate(providers);

let car = injector.get(Car);

```

If I decorate the Car class accordingly then of course everything works fine. But the mentioned classes must stay dependency-free and not have a dependency to a specific framework like angular.

thanks for any help on this :)

 Andreas

[Andreas Grimm]

with dependency-free I meant no deps to 3rd-Party libs or frameworks. the Car class actually has a dep to the Engine class in its constructor.

class Car {

  engine: Engine;

  

  constructor(engine: Engine) {

    this.engine = engine;

  }

} 

[Pascal Precht]

This is all being discussed here https://github.com/angular/angular/issues/4404

Unfortunately, there's currently no way to get around this unless TS comes up with a dedicated API :(