31 lines
647 B
JavaScript
31 lines
647 B
JavaScript
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// @flow
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import { isIconUrl } from './functions';
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declare var config: Object;
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/**
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* Tries to preload an image.
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*
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* @param {string} src - Source of the avatar.
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* @returns {Promise}
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*/
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export function preloadImage(src: string): Promise<string> {
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if (isIconUrl(src)) {
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return Promise.resolve(src);
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}
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if (typeof config === 'object' && config.disableThirdPartyRequests) {
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return Promise.reject();
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}
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return new Promise((resolve, reject) => {
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const image = document.createElement('img');
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image.onload = () => resolve(src);
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image.onerror = reject;
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image.src = src;
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});
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}
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