Fallback languages

To configure one or more fallback languages use the fallbackLanguage and fallbacks options.

The fallbackLanguage languages is used when no language is resolved.

src/app.module.ts

I18nModule.forRoot({
  fallbackLanguage: 'en',
  fallbacks: {
    'en-CA': 'fr',
    'en-*': 'en',
    'fr-*': 'fr',
    pt: 'pt-BR',
  },
  loaderOptions: {
    path: path.join(__dirname, '/i18n/'),
  },
});

You can also use this resolution logic in your own code, using the I18nService.resolveLanguage method.

src/static-media.service.ts

async serveLocalizedMedia(lang: string) {
  return this.getMediaForLanguage(this.i18nService.resolveLanguage(lang));
}

tip

With the fallbacks option you can have different fallbackLanguage for each language. (It works like a regex en-ZA will fallback to en).