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33 lines
660 B
JavaScript
33 lines
660 B
JavaScript
// @ts-check
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/**
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* @param {(() => void) | (() => Promise<void>)} callback
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* @returns {Promise<void>}
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*/
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export default function ready(callback) {
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return new Promise((resolve, reject) => {
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function loaded() {
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let result;
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try {
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result = callback();
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} catch (err) {
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reject(err);
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return;
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}
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if (typeof result?.then === 'function') {
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result.then(resolve).catch(reject);
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} else {
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resolve();
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}
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}
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if (['interactive', 'complete'].includes(document.readyState)) {
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loaded();
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} else {
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document.addEventListener('DOMContentLoaded', loaded);
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}
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});
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}
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