searchSubjectPipe.ts

this.results$ = this.searchSubject$.pipe(
  debounceTime(200),
  distinctUntilChanged(),
  switchMap((searchString) => {
    if ((searchString as any).replace(/\s/g, '')) {
      switch (this.searchType) {
        case SearchType.REPOS:
          return this.githubService.searchRepos(searchString);
        case SearchType.USERS:
          return this.githubService.searchUsers(searchString);
        default:
          break;
      }
    }
  })
);