@HostListener('keydown', ['$event', '$event.keyCode'])  onKeyDown($event: KeyboardEvent, keyCode) {    if(keyCode !== TAB) {      $event.preventDefault();    }    // get value for the key    const val = String.fromCharCode(keyCode);    // get position    const cursorPos = this.input.selectionStart;    overWriteCharAtPosition(this.input, val, cursorPos);  }export const overWriteCharAtPosition = (  input: HTMLInputElement,  val: any,  position: number) => {  const currentValue = input.value;  input.value = currentValue.slice(0, position) + val + currentValue.slice(position+1);};