frontend/js/core/i18n.js in trestle-0.9.8 vs frontend/js/core/i18n.js in trestle-0.10.0.pre

@@ -1,24 +1,38 @@
+import { I18n } from 'i18n-js'
 import flatpickr from 'flatpickr'
 
 // Container for i18n translations
-export const i18n = {}
+export const i18n = new I18n()
 
+function localizeTrestle (locale, fallbacks) {
+  // Set up i18n fallbacks
+  i18n.enableFallback = true
+  i18n.locales.register(locale, [locale, ...fallbacks])
+
+  // Set current locale
+  i18n.locale = locale
+}
+
 // Some of Flatpickr's locale names differ from Rails. This maps the Rails I18n locale to their Flatpickr equivalent.
 const FlatpickrLocaleConversions = { ca: 'cat', el: 'gr', nb: 'no', vi: 'vn' }
 
-// Sets up localization for Trestle and its dependencies, in particular Flatpickr.
-// This method accepts a list of locales in descending order of priority.
-//
-//     Trestle.localize('es-MX', 'es', 'en')
-//
-export function localize () {
-  for (var i = 0; i < arguments.length; ++i) {
-    var locale = arguments[i]
-    var flatpickrLocale = FlatpickrLocaleConversions[locale] || locale
+function localizeFlatpickr (...locales) {
+  for (const locale of locales) {
+    const flatpickrLocale = FlatpickrLocaleConversions[locale] || locale
 
     if (flatpickr.l10ns[flatpickrLocale]) {
       flatpickr.localize(flatpickr.l10ns[flatpickrLocale])
       break
     }
   }
+}
+
+// Sets up localization for Trestle and its dependencies, in particular Flatpickr.
+// This method accepts a list of locales in descending order of priority.
+//
+//     Trestle.localize('es-MX', 'es', 'en')
+//
+export function localize (locale, ...fallbacks) {
+  localizeTrestle(locale, fallbacks)
+  localizeFlatpickr(locale, ...fallbacks)
 }