error TS2415: Class 'Subject<T>' incorrectly extends base class 'Observable<T>'

[msolvaag]

RxJS version: 5.4.1
Typescript version: 2.4.1

ERROR in 
..\node_modules\rxjs\Subject.d.ts
(16,22): error TS2415: 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'.

Typescript is getting stricter. The lift method for Subject is not compatible with Observable.lift

[kwonoj]

dupe of #2699 , #2539, #2700 . #2701 #2702 #2703 #2704 #2705 #2706 #2707 #2716

[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.