ng-coercion#counter-coerce.ts

private _value: number;
get value(): number {
  return this._value;
}
@Input()
set value(value: number) {
  this._value = coerceNumberProperty(value, 0);
}

private _tick: number;
get tick(): number {
   return this._tick;
}
@Input()
set tick(value: number) {
  this._tick = coerceNumberProperty(value);
}