IntersectionObserver constructor Null safety

IntersectionObserver(
  1. IntersectionObserverCallback callback,
  2. [Map? options]
)

Implementation

factory IntersectionObserver(IntersectionObserverCallback callback,
    [Map? options]) {
  if (options != null) {
    var callback_1 = convertDartClosureToJS(callback, 2);
    var options_2 = convertDartToNative_Dictionary(options);
    return IntersectionObserver._create_1(callback_1, options_2);
  }
  var callback_1 = convertDartClosureToJS(callback, 2);
  return IntersectionObserver._create_2(callback_1);
}