Function loadScriptOnce

public/js/upload.js:475–488

(src)

let _resumableLoadPromise = null;

function loadScriptOnce(src) {
  if (loadScriptOnce._cache?.has(src)) return loadScriptOnce._cache.get(src);
  loadScriptOnce._cache = loadScriptOnce._cache || new Map();
  const p = new Promise((resolve, reject) => {
    const s = document.createElement('script');
    s.src = src;
    s.async = true;
    s.onload = resolve;
    s.onerror = () => reject(new Error(`Failed to load ${src}`));
    document.head.appendChild(s);
  });
  loadScriptOnce._cache.set(src, p);
  return p;
}

function lazyLoadResumable() {
  if (window.Resumable) return Promise.resolve(window.Resumable);