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Comment by Matthias247 | Hacker News Reader

Well written article!

One question regarding the "More declarative replacement for dart:mirrors" chapter: Is this what typescript/js is doing, with emitting and processing metadata only for decorated types?

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Yes and no. "Yes" because JS decorators are indeed very local - they apply to what they decorate. "No" because JS decorators are still imperative. Essentially when you write

    @D class A { }

this simply means something along the lines of:

    class A { }
    D(A)

where D is an arbitrary function doing arbitrary things to A. There is nothing declarative here.

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