Internationalization Module

This module allows you to provide translations to an application or module.

Basic Concepts

Internationalization Module uses the following elements to provide translations:

• LANGUAGE_SCHEMAS allow you to define languages and language models
• TRANSLATION_SOURCES defines sources for translation files
• USER_LANGUAGE provides the current user's language
• TRANSLATION_NAMESPACE provides the namespace of language variables inside feature modules
• TRANSLATION_LIBRARIES defines third-party libraries that shall be translated along the first-party modules.

How to use

// app.module.ts

import { NgModule } from '@angular/core';
import { InternationalizationModule } from '@conclurer/i18n';

@NgModule({
  imports: [
    InternationalizationModule.forRoot({
      supportedLanguages: [
        {
          code: 'de-de',
          simplifiedCode: 'de',
          pluralization: n => (n === 1 ? 'one' : 'other'),
        },
      ],
      userLanguage: {
        code: 'de-de',
        simplifiedCode: 'de',
      },
      libraryTranslation: [
        locale => {
          // todo translate third-party library on language change
        },
      ],
      translationSources: [
        locale => import(`./_i18n/${locale.simplifiedCode}.json`).then(m => m.default),
      ],
    }),
  ],
})
export class AppModule {}

// de.json
{
  "greeting": "Hallo Welt",
  "messages": {
    "notification": {
      "one": "%{count} Benachrichtigung",
      "other": "%{count} Benachrichtigungen"
    }
  }
}

<!-- <h1>Hallo Welt</h1> -->
<h1>{{ 'greeting' | t }}</h1>
<!-- <p>5 Benachrichtigungen</p> -->
<p>{{ 'messages.notification' | t: {count: 5} }}</p>

Usage in Feature Modules

In feature modules, you should define a special provider that can then be provided directly into the target components.

It is not possible to import feature module providers in NgModuless that are not imported using Angular's router.

This is because Angular attaches child module providers to the root injector.

import { InternationalizationModule } from '@conclurer/i18n';

export const FEATURE_MODULE_TRANSLATIONS = InternationalizationModule.exportedComponentProviders({
  localNamespace: 'featureModuleNamespace',
  translationSources: [
    locale => import(`./feature/_i18n/${locale.simplifiedCode}.json`).then(m => m.default),
  ],
});

// feature/_i18n/de.json
{
  "example": "Feature Module Example"
}

// Feature component

import { Component } from '@angular/core';

@Component({
  providers: [
    FEATURE_MODULE_TRANSLATIONS,
  ],
})
export class FeatureComponent {}

<!-- This uses the global namespace -->
<h1>{{ 'greeting' | t }}</h1>

<!-- Local namespace -->
<!-- <h1>Feature Module Example</h1> -->
<h1>{{ '@.example' | t }}</h1>

<!-- Local lang var, accessed via global namespace -->
<!-- <h1>Feature Module Example</h1> -->
<h1>{{ 'featureModuleNamespace.example' | t }}</h1>