RxJs encounters build error with TypeScript 2.4.1

[samherrmann]

RxJS version:
5.4.1

Code to reproduce:
N/A. See Additional information below.

Expected behavior:
Successful build

Actual behavior:
Build error:

ERROR in node_modules/rxjs/Subject.d.ts (16,22): Class 'Subject<T>' i
ncorrectly 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'.

Additional information:
The build error is encountered inside of an Angular project created with the Angular CLI. Steps to reproduce the error:

1. npm install -g @angular/cli
2. ng new my-project
3. cd my-project
4. Inside package.json, change typescript version to 2.4.1
5. npm update
6. ng build
7. Build fails

Build fails with TypeScript 2.4.1
Build passes with TypeScript 2.4.0

[kwonoj]

dupe of #2699 and #2539 .

[lock]

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