[improvement] organize type definitions

packages/utils/use/i18n.ts

@@ -1,10 +1,11 @@
 import { get, camelize } from '..';
 import locale from '../../locale';
 
-export const useI18N = (name: string) => {
+export function useI18N(name: string) {
   const prefix = camelize(name) + '.';
-  return (path: string, ...args: any[]): string => {
+
+  return function (path: string, ...args: any[]): string {
     const message = get(locale.messages(), prefix + path) || get(locale.messages(), path);
     return typeof message === 'function' ? message(...args) : message;
   };
-};
+}