Compiler error: AsyncSubject returns Observable, should return AsyncSubject.

[raysuelzer]

RxJS version:
5.5.0

Code to reproduce:

 import {AsyncSubject} from 'rxjs/Rx';
export class ShouldWork {
    subject: AsyncSubject<boolean> = new AsyncSubject<boolean>().map(t => t);
}

Expected behavior:
Should not throw typescript error. Should know that return type is a subject not observable.
Actual behavior:
severity: 'Error'
message: 'Type 'Observable' is not assignable to type 'AsyncSubject'.
Property 'value' is missing in type 'Observable'.'
Additional information:
Occurs on Typescript versions: 2.4.0, 2.4.1, 2.5.3
Occurs even with --noStrictGenericChecks

[kwonoj]

It is currently known expected design of extended variant of observable doesn't carry over its characteristics via operator chain by creating new observables. Similar, or possible dupe of #2378.

[raysuelzer]

This only seems partially true to me, as all of the characteristics from my return object are carried over via operator chain except for .value. I know there is a reason for this, but it is a big bummer that you can't use typescript with AsyncSubject because it thinks it is returning an Observable when it isn't.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.