Cannot 'export default' abstract, ambient class or interface

export default abstract class B {

}

By the way, the same with

export default declare class B {

}

Seems to be a parser bug

[danquirk]

We should just allow these. It’s a strange inconsistency, the workaround is more verbose, and the error gives you no help getting to the workaround.

[mhegazy]

Unsupported export default patterns:

• export default abstract class C { } Added by #14657
• export default declare class C { }
• export default interface I { } Added by #16040
• export default enum E { }
• export default const enum E { }
• export default namespace N { }
• export default type T = { }