Function renderApplication

packages/platform-server/src/utils.ts:342–380

(
  bootstrap: (context: BootstrapContext) => Promise<ApplicationRef>,
  options: {
    document?: string | Document;
    url?: string;
    platformProviders?: Provider[];
    allowedHosts?: Readonly<string>[];
  },
)

 * @publicApi
 */
export async function renderApplication(
  bootstrap: (context: BootstrapContext) => Promise<ApplicationRef>,
  options: {
    document?: string | Document;
    url?: string;
    platformProviders?: Provider[];
    allowedHosts?: Readonly<string>[];
  },
): Promise<string> {
  const renderAppLabel = 'renderApplication';
  const bootstrapLabel = 'bootstrap';
  const _renderLabel = '_render';
  const {url, allowedHosts} = options;

  validateAllowedHosts(url, allowedHosts);

  startMeasuring(renderAppLabel);
  const platformRef = createServerPlatform(options);
  try {
    startMeasuring(bootstrapLabel);
    const applicationRef = await bootstrap({platformRef});
    stopMeasuring(bootstrapLabel);

    startMeasuring(_renderLabel);

    const measuringLabel = 'whenStable';
    startMeasuring(measuringLabel);
    // Block until application is stable.
    await applicationRef.whenStable();
    stopMeasuring(measuringLabel);

    const rendered = await renderInternal(platformRef, applicationRef);
    stopMeasuring(_renderLabel);
    return rendered;
  } finally {
    await asyncDestroyPlatform(platformRef);
    stopMeasuring(renderAppLabel);
  }
}

function validateAllowedHosts(url: string | undefined, allowedHosts: string[] | undefined) {
  if (typeof url === 'string') {