refactor: migrate util.js to TypeScript

Author: koba04

test/utils.js renamed to test/utils.ts

@@ -1,13 +1,13 @@
-import { render as baseRender } from '@testing-library/react/pure';
+import { render as baseRender, RenderOptions } from '@testing-library/react/pure';
 import React from 'react';
 
 export * from '@testing-library/react';
-export function render(element, options) {
+export function render(element: React.ReactElement, options?: RenderOptions) {
   const result = baseRender(element, options);
 
   return {
     ...result,
-    setProps(props) {
+    setProps(props: any) {
       result.rerender(React.cloneElement(element, props));
     },
   };