refactor: global shared state and function (#79)

* refactor: expose i18n instance

* feat: add global app utility function

* refactor: use global utility function

* refactor: avoid undefined when use outside vue

refactor: avoid undefined when use outside vue

* refactor: remove dup code and use util

* refactor: auto fetch option when use store

src/boot/i18n.ts

@@ -21,13 +21,16 @@ declare module 'vue-i18n' {
 }
 /* eslint-enable @typescript-eslint/no-empty-interface */
 
-export default boot(({ app }) => {
-  const i18n = createI18n({
-    locale: 'tha',
-    legacy: false,
-    messages,
-  });
+export const i18n = createI18n({
+  locale: 'tha',
+  legacy: false,
+  messages: {
+    'en-US': {},
+    ...messages,
+  },
+});
 
+export default boot(({ app }) => {
   // Set i18n instance on app
   app.use(i18n);
 });