| 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 | /** |
| 13 | * Checks if an event is supported in the current execution environment. |
| 14 | * |
| 15 | * NOTE: This will not work correctly for non-generic events such as `change`, |
| 16 | * `reset`, `load`, `error`, and `select`. |
| 17 | * |
| 18 | * Borrows from Modernizr. |
| 19 | * |
| 20 | * @param {string} eventNameSuffix Event name, e.g. "click". |
| 21 | * @return {boolean} True if the event is supported. |
| 22 | * @internal |
| 23 | * @license Modernizr 3.0.0pre (Custom Build) | MIT |
| 24 | */ |
| 25 | function isEventSupported(eventNameSuffix: string): boolean { |
| 26 | if (!canUseDOM) { |
| 27 | return false; |
| 28 | } |
| 29 | |
| 30 | const eventName = 'on' + eventNameSuffix; |
| 31 | let isSupported = eventName in document; |
| 32 | |
| 33 | if (!isSupported) { |
| 34 | const element = document.createElement('div'); |
| 35 | element.setAttribute(eventName, 'return;'); |
| 36 | isSupported = typeof (element as any)[eventName] === 'function'; |
| 37 | } |
| 38 | |
| 39 | return isSupported; |
| 40 | } |
| 41 | |
| 42 | export default isEventSupported; |