Using the JiT Compiler

The JiT (Just-in-time) compiler compiles the application dynamically, as the application loads. To do this, we will need to rely on 3 providers that tell the JiT compiler how to translate the template texts for a particular language:

  • TRANSLATIONS is a string containing the content of the translation file.

  • TRANSLATIONS_FORMAT is the format of the file.

  • LOCALE_ID is the locale of the target language.

Here's how to boostrap the app with the translation providers for French. We're assuming the translation file is


import { NgModule, TRANSLATIONS, TRANSLATIONS_FORMAT, LOCALE_ID } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { Hello } from './app.component.ts';

declare const require;
const translations = require(`raw-loader!./`);

const localeId = 'fr';

  imports: [
  declarations: [
  bootstrap: [ Hello ]
export class AppModule {

platformBrowserDynamic().bootstrapModule(AppModule, {
  providers: [
    { provide: TRANSLATIONS, useValue: translations },
    { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' },
    { provide: LOCALE_ID, useValue: localeId }

We're using webpack and raw-loader to load the load the translations. We could alternatively make an http call based on which language we're interested in, and asynchronously bootstrap the app once its loaded.

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