@gitlab/ui
Version:
GitLab UI Components
34 lines (30 loc) • 1.19 kB
JavaScript
/**
* This file is based on Vue's scheduler code:
* https://github.com/vuejs/vue/blob/v2.6.12/src/core/observer/scheduler.js#L44-L66
*
* See the LICENSE file in this directory.
*/
const {
performance
} = window;
/**
* Get a current timestamp that can be meaningfully compared to an event's
* `timeStamp` property.
*
* Event timestamps can be a DOMHighResTimeStamp (if supported), otherwise
* a DOMTimeStamp (used by jsdom and older browsers).
*
* This function will return a current timestamp of the same type used by the
* underlying environment when it creates DOM events.
*
* See https://developer.mozilla.org/en-US/docs/Web/API/Event/timeStamp for
* more details.
*
* @returns {number}
*/
const getEventLikeTimeStamp =
// If the event timestamp, although evaluated AFTER the Date.now(), is
// smaller, it means the event is using a hi-res timestamp, and we need to
// use the hi-res version for event listener timestamps as well.
typeof (performance === null || performance === void 0 ? void 0 : performance.now) === 'function' && Date.now() > document.createEvent('Event').timeStamp ? () => performance.now() : () => Date.now();
export { getEventLikeTimeStamp };