Function extensionScriptsInNode

src/service/extension-script.js:244–270

(head)

 * @return {!Array<{script: HTMLScriptElement, extensionId: string, extensionVersion: string}>}
 */
export function extensionScriptsInNode(head) {
  // ampdoc.getHeadNode() can return null.
  if (!head) {
    return [];
  }
  // Note: Some extensions don't have [custom-element] or [custom-template]
  // e.g. amp-viewer-integration.
  const list = head.querySelectorAll(
    'script[custom-element],script[custom-template]'
  );
  const scripts = [];
  for (let i = 0; i < list.length; i++) {
    const script = list[i];
    const extensionId =
      script.getAttribute('custom-element') ||
      script.getAttribute('custom-template');
    const urlParts = parseExtensionUrl(script.src);
    if (extensionId && urlParts) {
      scripts.push({
        script,
        extensionId,
        extensionVersion: urlParts.extensionVersion,
      });
    }
  }
  return scripts;
}

/**
 * Verifies that an extension script is present in head for