问Angular 6，rxjs 6 forkJoin a map

EN

Observable.forkJoin(
  Observable.of('test1'),
  Observable.of('test2')
).map(result => {
  console.log(result);
}).subscribe();

forkJoin(
  of('test1'),
  of('test2')
).pipe(map(result => {
  console.log(result);
})).subscribe();

ERROR in app/services/bundles/karaf-bundles.service.ts(47,12): error TS2345: Argument of type 'OperatorFunction<[string, string], void>' is not assignable to parameter of type 'OperatorFunction<any, any>'.
  Types of parameters 'source' and 'source' are incompatible.
    Type 'Observable<any>' is not assignable to type 'Observable<[string, string]>'.
      Types of property 'source' are incompatible.
        Type 'import("/Users/moritzvieli/node_modules/rxjs/internal/Observable").Observable<any>' is not assignable to type 'import("/Users/moritzvieli/repo/cltmgmtconsole/web/node_modules/rxjs/internal/Observable").Observ...'.
          Types of property 'source' are incompatible.
            Type 'import("/Users/moritzvieli/node_modules/rxjs/internal/Observable").Observable<any>' is not assignable to type 'import("/Users/moritzvieli/repo/cltmgmtconsole/web/node_modules/rxjs/internal/Observable").Observ...'.