mastodon/app/javascript/flavours/glitch/load_polyfills.js

43 lines
1.3 KiB
JavaScript
Raw Normal View History

// Convenience function to load polyfills and return a promise when it's done.
// If there are no polyfills, then this is just Promise.resolve() which means
// it will execute in the same tick of the event loop (i.e. near-instant).
function importBasePolyfills() {
return import(/* webpackChunkName: "base_polyfills" */ './base_polyfills');
}
function importExtraPolyfills() {
return import(/* webpackChunkName: "extra_polyfills" */ './extra_polyfills');
}
function loadPolyfills() {
const needsBasePolyfills = !(
2018-08-23 20:02:42 +00:00
Array.prototype.includes &&
HTMLCanvasElement.prototype.toBlob &&
window.Intl &&
Number.isNaN &&
2018-08-23 20:02:42 +00:00
Object.assign &&
Object.values &&
window.Symbol &&
Promise.prototype.finally
);
// Latest version of Firefox and Safari do not have IntersectionObserver.
// Edge does not have requestIdleCallback.
// This avoids shipping them all the polyfills.
const needsExtraPolyfills = !(
window.AbortController &&
window.IntersectionObserver &&
window.IntersectionObserverEntry &&
'isIntersecting' in IntersectionObserverEntry.prototype &&
window.requestIdleCallback
);
return Promise.all([
needsBasePolyfills && importBasePolyfills(),
needsExtraPolyfills && importExtraPolyfills(),
]);
}
export default loadPolyfills;