Angular 2 in ES6 without decorators

With Angular 2 now in beta, it’s definitely time to start playing with it. One of my first questions was: what language to use? The first example in the Angular 2 website says

While this example uses TypeScript, Angular works equally well with ES5, ES6 and Dart as well.

Those are the languages officially supported by Angular 2. Dart has lost most of its appeal since they declared it won’t be integrated into Chrome, so I’ll just gloss over it.

Angular 2 itself is written in TypeScript, and so are most of the official examples available so far. I do like TypeScript and it is arguably the best choice for large projects. However it may be overkill for smaller apps or just some quick experiments. Configuring type definitions for existing JavaScript libraries in particular can be a bit of a pain.

ES5 is just… old. If we use JavaScript for a new project today we may as well start with ES6. Surprisingly though I could find very few Angular 2 examples in ES6. And those few typically use decorators, a language feature that is not actually in the ES6 standard but one proposed for ES7. As a result it’s only partially supported by Babel for example.

So, is it actually possible to write Angular 2 components in “pure” ES6, with code similar to the TypeScript examples but without types and decorators?
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