Method applyUrl

packages/utils/src/asset.ts:139–169

(url: string)

  }

  applyUrl(url: string) {
    if (this.lastUrl === url) {
      return;
    }
    this.lastContent = undefined;
    this.lastUrl = url;
    const element = document.createElement('link');
    element.onload = onload;
    element.onerror = onload;

    const i = createDefer();
    function onload(e: any) {
      element.onload = null;
      element.onerror = null;
      if (e.type === 'load') {
        i.resolve();
      } else {
        i.reject();
      }
    }

    element.href = url;
    element.rel = 'stylesheet';
    if (this.id) {
      element.setAttribute('data-id', this.id);
    }
    document.head.insertBefore(element, this.placeholder.parentNode === document.head ? this.placeholder.nextSibling : null);
    document.head.removeChild(this.placeholder);
    this.placeholder = element;
    return i.promise();
  }
}

function parseAssetList(scripts: any, styles: any, assets: AssetList, level?: AssetLevel) {