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  1. // @flow
  2.  
  3. let listener: EventListener = function (event: Event) :void {};
  4.  
  5. let tests = [
  6.   // attachEvent
  7.   function() {
  8.     let target = new EventTarget();
  9.     (target.attachEvent('foo', listener): void); // invalid, may be undefined
  10.     (target.attachEvent && target.attachEvent('foo', listener): void); // valid
  11.   },
  12.  
  13.   // detachEvent
  14.   function() {
  15.     let target = new EventTarget();
  16.     (target.detachEvent('foo', listener): void); // invalid, may be undefined
  17.     (target.detachEvent && target.detachEvent('foo', listener): void); // valid
  18.   },
  19.  
  20.   function() {
  21.     window.onmessage = (event: MessageEvent) => {
  22.       (event.target: window);
  23.     };
  24.   },
  25. ];
  26.  
downloadeventtarget.js Source code - Download prettier Source code
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