Is there an equivalent to “sealed” or “final” in TypeScript?

Question

I\'m trying to implement a method in a super class that should be available for use, but not changeable, in sub classes. Consider this:

export abstract clas         


        

Answer 1

No, at the time of this writing there is not. There is a proposal for such a keyword which is still being considered, but may or may not ever be implemented.

See:

• github.com/Microsoft/TypeScript/issues/9264, and
• github.com/Microsoft/TypeScript/issues/8306