1. /**
    
  2.  * Copyright (c) Meta Platforms, Inc. and affiliates.
    
  3.  *
    
  4.  * This source code is licensed under the MIT license found in the
    
  5.  * LICENSE file in the root directory of this source tree.
    
  6.  *
    
  7.  * @flow
    
  8.  */
    
  9. 
    
  10. import {canUseDOM} from 'shared/ExecutionEnvironment';
    
  11. 
    
  12. export let passiveBrowserEventsSupported: boolean = false;
    
  13. 
    
  14. // Check if browser support events with passive listeners
    
  15. // https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
    
  16. if (canUseDOM) {
    
  17.   try {
    
  18.     const options: {
    
  19.       passive?: void,
    
  20.     } = {};
    
  21.     Object.defineProperty(options, 'passive', {
    
  22.       get: function () {
    
  23.         passiveBrowserEventsSupported = true;
    
  24.       },
    
  25.     });
    
  26.     window.addEventListener('test', options, options);
    
  27.     window.removeEventListener('test', options, options);
    
  28.   } catch (e) {
    
  29.     passiveBrowserEventsSupported = false;
    
  30.   }
    
  31. }