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function loadScript(url, { doc = document }={}) {
return new Promise((resolve, reject) => {
const script = doc.createElement('script');
script.onload = () => resolve();
script.onerror = () => reject(Error("Script load failed"));
script.src = url;
doc.body.appendChild(script);
})
}
function preloadImage(url, { doc = document }={}) {
return new Promise((resolve, reject) => {
const preload = doc.createElement('link');
preload.rel = 'preload';
preload.as = 'image';
preload.onload = () => resolve();
preload.onerror = () => resolve();
preload.href = url;
doc.body.appendChild(preload);
})
}
/**
*
* @param {Document} document
* @param {string|URL} url
* @returns {HTMLAudioElement}
*/
function appendAudio(document, url) {
const audio = document.createElement('audio');
audio.muted = true;
audio.src = url;
audio.preload = true;
document.body.appendChild(audio);
return audio;
}