Compile error with typescript 2.4.1

[cfarmerga]

With typescript 2.4.1, I get a compile error when trying to use rxjs 5.4.1 in my trivial angular 4 cli app during the webpack step. When I revert to typescript 2.3.3 using the same rxjs version, there is no error and rxjs features seem to work as expected.

ERROR in myapppath/node_modules/rxjs/Subject.d.ts (16,22): Class 'Subject<T>' incorrectly extends base class 'Observable<T>'. Types of property 'lift' are incompatible. Type '<R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator: Operator<T, R>) => Observable<R>'. Type 'Observable<T>' is not assignable to type 'Observable<R>'. Type 'T' is not assignable to type 'R'. webpack: Failed to compile.

When I look at Observable.d.ts and Subject.d.ts, I see that it's true that the lift method is returning different types, even though Subject extends Observable here:

In Subject.d.ts:
lift<R>(operator: Operator<T, R>): Observable<T>;

In Observable.d.ts:
lift<R>(operator: Operator<T, R>): Observable<R>;

This blog post suggests stricter generic type checking on functions in 2.4, so I'm guessing the Subject.d.ts method sig might be a typo that was not noticed.
https://blogs.msdn.microsoft.com/typescript/2017/06/27/announcing-typescript-2-4/

RxJS version: 5.4.1

Code to reproduce:

Expected behavior:

Actual behavior:

Additional information:

[kwonoj]

dupe of #2699 , #2539, #2700 .

[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.