Function loadScript

src/validator-integration.js:43–80

(doc, url)

 * @return {!Promise}
 */
export function loadScript(doc, url) {
  const script = /** @type {!HTMLScriptElement} */ (
    doc.createElement('script')
  );
  // Make script.src assignment Trusted Types compatible for compatible browsers
  if (self.trustedTypes && self.trustedTypes.createPolicy) {
    const policy = self.trustedTypes.createPolicy(
      'validator-integration#loadScript',
      {
        createScriptURL: function (url) {
          // Only allow trusted URLs
          // Using explicit cdn domain as no other AMP Cache hosts validator_
          // wasm so we can assume the explicit cdn domain is cdn.ampproject.org
          // instead of using the dynamic cdn value from src/config/urls.js
          // eslint-disable-next-line local/no-forbidden-terms
          if (url === 'https://cdn.ampproject.org/v0/validator_wasm.js') {
            return url;
          } else {
            return '';
          }
        },
      }
    );
    script.src = policy.createScriptURL(url);
  } else {
    script.src = url;
  }
  propagateNonce(doc, script);

  const promise = loadPromise(script).then(
    () => {
      doc.head.removeChild(script);
    },
    () => {}
  );
  doc.head.appendChild(script);
  return promise;
}