Function renderUrl

libs/isr/server/src/utils/render-url.ts:29–104

(options: RenderUrlConfig)

// helper method that generates html of an url
export const renderUrl = async (options: RenderUrlConfig): Promise<string> => {
  const {
    req,
    res,
    url,
    indexHtml,
    providers,
    commonEngine,
    angularAppEngine,
    bootstrap,
    browserDistFolder,
    inlineCriticalCss,
  } = options;

  // we need to override url of req with the one we have in parameters,
  // because during invalidate process, the url is not from the request
  req.url = url;
  req.originalUrl = url;

  const { protocol, originalUrl, baseUrl, headers } = req;
  const BASE_URL_PROVIDER: Provider = {
    provide: APP_BASE_HREF,
    useValue: baseUrl,
  };

  return new Promise((resolve, reject) => {
    const allProviders = providers
      ? [...providers, ...EXTRA_PROVIDERS] // if providers are provided, we add them to the list
      : [...EXTRA_PROVIDERS, BASE_URL_PROVIDER]; // if not, we add the default providers

    if (angularAppEngine) {
      angularAppEngine
        .handle(req)
        .then((response) => {
          if (response) {
            return response.text();
          }
          throw new Error('No response from Angular App Engine');
        })
        .then((html) => {
          resolve(html);
        })
        .catch((err) => {
          reject(err);
        });
    } else if (commonEngine) {
      commonEngine
        .render({
          bootstrap,
          documentFilePath: indexHtml,
          url: `${protocol}://${headers.host}${originalUrl}`,
          publicPath: browserDistFolder,
          inlineCriticalCss: inlineCriticalCss ?? true,
          providers: [...allProviders] as StaticProvider[], // we need to cast to StaticProvider[] because of a bug in the types
        })
        .then((html) => {
          resolve(html);
        })