| 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 | } |