Migracja z wersji Vue 2 na Vue 3

src/i18n.ts

@@ -0,0 +1,27 @@
+import { createI18n, LocaleMessages, VueMessageType } from 'vue-i18n'
+
+/**
+ * Load locale messages
+ * 
+ * The loaded `JSON` locale messages is pre-compiled by `@intlify/vue-i18n-loader`, which is integrated into `vue-cli-plugin-i18n`.
+ * See: https://github.com/intlify/vue-i18n-loader#rocket-i18n-resource-pre-compilation
+ */
+function loadLocaleMessages(): LocaleMessages<VueMessageType> {
+  const locales = require.context('./locales', true, /[A-Za-z0-9-_,\s]+\.json$/i)
+  const messages: LocaleMessages<VueMessageType> = {}
+  locales.keys().forEach(key => {
+    const matched = key.match(/([A-Za-z0-9-_]+)\./i)
+    if (matched && matched.length > 1) {
+      const locale = matched[1]
+      messages[locale] = locales(key)
+    }
+  })
+  return messages
+}
+
+export default createI18n({
+  legacy: false,
+  locale: process.env.VUE_APP_I18N_LOCALE || 'en',
+  fallbackLocale: process.env.VUE_APP_I18N_FALLBACK_LOCALE || 'en',
+  messages: loadLocaleMessages()
+})