Sample app initSearchUsers method

initSearchUsers.ts

initSearchUsers(): void {
  this.searchUsersFormControl.valueChanges
    .pipe(takeUntil(this.destroyed$))
    .subscribe((searchString) => {
      if (searchString) {
        this.searchType = SearchType.USERS;
        this.searchSubject$.next(searchString);
      }
    });
}