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32 lines
660 B
32 lines
660 B
// @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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