export function loadScript(src) {
  let firstScript = document.getElementsByTagName('script')[0];
  let scriptNode;

  return new Promise((resolve, reject) => {
    scriptNode = document.createElement('script');
    scriptNode.async = 1;
    scriptNode.src = src;

    scriptNode.onload = () => resolve();
    scriptNode.onerror = () => reject(new Error(`failed to load: ${src}`));

    firstScript.parentNode.insertBefore(scriptNode, firstScript);
  });
}