can you add a declaration emit test.

can you also add a test with --strictNullchecks and an optional parameter property declaration, e.g. constructor(private a?: number) { }

also another one for extending classes, making optionals non-optional, and making non-optionals optional.

@ahejlsberg Nice job! Just curious, can decorators fetch information that can determine whether the target is declared optional?

can decorators fetch information that can determine whether the target is declared optional?

no, see #8126

Optional class properties don't seem to work for abstract properties in typescript 2.0.3, subclasses of the abstract class are forced to implement the property.

@Roam-Cooper that's the point of the abstract modifier, to require that an implementation is provided by a subclass. If it's optional you don't have to override it meaning it should not be abstract.

Ah, yes, wasn't thinking straight! My bad. 😃

Does this PR enable making class getters optional? I can't figure out how to mark getters as optional. I have no idea where the question mark would go.

@bradenhs I have the same question. Would be nice for my situation, where I want to make a custom derived class (which has getters) compatible with the base class definition/type-shape.

@Venryx I made an issue for this (#14417) but it was shot down. I don't think the guy reviewing the issue fully understood what I was getting at. You could create another issue and give a better explanation of the problem though. If you do let me know!