message: Add missing default value description
diff: @@ -62,11 +62,12 @@ declare global {
  /**
  * Use the Fetch API to retrieve a resource and return a Blob instance for it.
  * @param options - Options to configure the loading behaviour.
  + * (default: `{}`)
  * @internal
  */
  protected _fetchResource(
  src: string,
  - options: {
  + options?: {
  /**
  * Append a cache-busting query parameter to the request.
  * @defaultValue `false`
  