searchSub.ts

  ngOnInit() {
    // this.results$ = this.searchSubject$.pipe...

    this.searchReposSub = this.searchReposFormControl.valueChanges.subscribe(
      (searchString) => {
        if (searchString) {
          this.searchType = SearchType.REPOS;
          this.searchSubject$.next(searchString);
        }
      }
    );

    this.searchUsersSub = this.searchUsersFormControl.valueChanges.subscribe(
      (searchString) => {
        if (searchString) {
          this.searchType = SearchType.USERS;
          this.searchSubject$.next(searchString);
        }
      }
    );
  }