emitDecoratorMetadata should include abstract-ness

[qc00]

Before TS 1.6, I "annotated" many classes with a static boolean property named abstract to tell some introspection code not to use them. However, it seems there is no run-time equilavent of this for TS 1.6 abstract classes. Can something like this be added?

Maybe this could be done as an implicit decorator that does nothing by default?

[danquirk]

Could you give a more concrete example of why your own decorator function isn't sufficient here?

[qc00]

If I use my own, I'll have to use on the same class a keyword and a decorator that seems to mean the same thing. This is confusing and error prone, so definitely not good for maintainability. The decorators proposal allow additional type info to be exposed through decorators, so why not the abstract-ness?

[danquirk]

So would it be sufficient if this flag #2577 included the abstractness?

[qc00]

Yeah, that would work I guess.

[RyanCavanaugh]

Doesn't seem to be sufficient demand to warrant further investigation here