UIEvent constructor Null safety

UIEvent(
  1. String type,
  2. {Window? view,
  3. int detail: 0,
  4. bool canBubble: true,
  5. bool cancelable: true}
)

Implementation

factory UIEvent(String type,
    {Window? view,
    int detail: 0,
    bool canBubble: true,
    bool cancelable: true}) {
  if (view == null) {
    view = window;
  }
  UIEvent e = document._createEvent("UIEvent") as UIEvent;
  e._initUIEvent(type, canBubble, cancelable, view, detail);
  return e;
}