Function ssr

packages/platform-server/test/hydration_utils.ts:246–277

(
  component: Type<unknown>,
  options: {
    doc?: string;
    envProviders?: Provider[];
    hydrationFeatures?: () => HydrationFeature<HydrationFeatureKind>[];
    enableHydration?: boolean;
  } = {},
)

 * @returns a promise containing the server rendered app as a string
 */
export async function ssr(
  component: Type<unknown>,
  options: {
    doc?: string;
    envProviders?: Provider[];
    hydrationFeatures?: () => HydrationFeature<HydrationFeatureKind>[];
    enableHydration?: boolean;
  } = {},
): Promise<string> {
  try {
    // Enter server mode for the duration of this function.
    globalThis['ngServerMode'] = true;

    const defaultHtml = DEFAULT_DOCUMENT;
    const {enableHydration = true, envProviders = [], hydrationFeatures = () => []} = options;
    const providers = [
      ...envProviders,
      provideServerRendering(),
      enableHydration ? provideClientHydration(...hydrationFeatures()) : [],
    ];

    const bootstrap = (context: BootstrapContext) =>
      bootstrapApplication(component, {providers}, context);

    return await renderApplication(bootstrap, {
      document: options?.doc ?? defaultHtml,
    });
  } finally {
    // Leave server mode so the remaining test is back in "client mode".
    globalThis['ngServerMode'] = undefined;
  }
}

/**
 * Verifies that there are no messages in a console.