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It's quite possible they did do that. For example, Angular parses your source to perform Dependency Injection based on argument names.

Well thanks for that. Now I know what not to use.

That's AngularJS released in 2010.

Angular 4 is TypeScript and therefore much less hacky.

To be fair, that was a fallback and was used only if you didn't annotate your dependencies, which is what Angular expected you to do.