Decorators are a core concept when developing with Angular 2 and above. There’s also an official TC39 proposal, currently at Stage-2, so expect decorators to become a core language feature soon in JavaScript as well.
Back to Angular, the internal codebase uses decorators extensively and in this post we’re going to look at the different types of decorators, the code they compile to and how they work.
Source: A deep dive on Angular decorators
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