searchSubArray.ts

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

  this.subscriptions.push(
    this.searchReposFormControl.valueChanges.subscribe((searchString) => {
      if (searchString) {
        this.searchType = SearchType.REPOS;
        this.searchSubject$.next(searchString);
      }
    }),
    this.searchUsersFormControl.valueChanges.subscribe((searchString) => {
      if (searchString) {
        this.searchType = SearchType.USERS;
        this.searchSubject$.next(searchString);
      }
    })
  );
}