Function updateAppModule

packages/schematics/angular/service-worker/index.ts:48–82

(mainPath: string)

}

function updateAppModule(mainPath: string): Rule {
  return (host: Tree, context: SchematicContext) => {
    context.logger.debug('Updating appmodule');

    const modulePath = getAppModulePath(host, mainPath);
    context.logger.debug(`module path: ${modulePath}`);

    addImport(host, modulePath, 'ServiceWorkerModule', '@angular/service-worker');
    addImport(host, modulePath, 'isDevMode', '@angular/core');

    // register SW in application module
    const importText = `
      ServiceWorkerModule.register('ngsw-worker.js', {
        enabled: !isDevMode(),
        // Register the ServiceWorker as soon as the application is stable
        // or after 30 seconds (whichever comes first).
        registrationStrategy: 'registerWhenStable:30000'
      })
    `;
    const moduleSource = getTsSourceFile(host, modulePath);
    const metadataChanges = addSymbolToNgModuleMetadata(
      moduleSource,
      modulePath,
      'imports',
      importText,
    );
    if (metadataChanges) {
      const recorder = host.beginUpdate(modulePath);
      applyToUpdateRecorder(recorder, metadataChanges);
      host.commitUpdate(recorder);
    }

    return host;
  };
}

function addProvideServiceWorker(projectName: string, mainPath: string): Rule {
  return (host: Tree) => {