angular/integration/cli-hello-world/src/app/app.module.ts

import {BrowserModule} from '@angular/platform-browser';
import {LOCALE_ID, NgModule} from '@angular/core';
import {registerLocaleData} from '@angular/common';
import localeFr from '@angular/common/locales/fr';

import {AppComponent} from './app.component';

// adding this code to detect issues like https://github.com/angular/angular-cli/issues/10322
registerLocaleData(localeFr);

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [{provide: LOCALE_ID, useValue: 'fr'}],
  bootstrap: [AppComponent],
})
export class AppModule {}