loadScript.ts

/**
 * @param {string} src
 * @param {Record<string, string>?} attrs
 * @returns {Promise<HTMLScriptElement>}
 */
function loadScript(src, attrs = {}) {
  return new Promise((res, rej) => {
    const s = Object.assign(document.createElement('script'), { src })
    Object.entries(attrs).forEach(([k, v]) => k && v !== void 0 && s.setAttribute(k, v))
    s.onload = () => res(s)
    s.onerror = (e) => rej(e)
    document.head.appendChild(s)
  })
}