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31 lines
787 B
31 lines
787 B
// from swr
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import { isDocumentVisible, isOnline } from './index';
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var listeners = [];
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function subscribe(listener) {
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listeners.push(listener);
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return function unsubscribe() {
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var index = listeners.indexOf(listener);
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listeners.splice(index, 1);
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};
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}
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var eventsBinded = false;
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if (typeof window !== 'undefined' && window.addEventListener && !eventsBinded) {
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var revalidate = function revalidate() {
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if (!isDocumentVisible() || !isOnline()) return;
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for (var i = 0; i < listeners.length; i++) {
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var listener = listeners[i];
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listener();
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}
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};
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window.addEventListener('visibilitychange', revalidate, false);
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window.addEventListener('focus', revalidate, false); // only bind the events once
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eventsBinded = true;
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}
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export default subscribe; |