feat: project init (#2)

src/index.tsx

@@ -0,0 +1,25 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable react/display-name */
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+  
+import App from './app';
+  
+export default () => <App/>;
+  
+let rootElement: ReactDOM.Root
+  
+export const mount = (Сomponent, element = document.getElementById('app')) => {
+  const rootElement = ReactDOM.createRoot(element);
+  rootElement.render(<Сomponent/>);
+
+  if(module.hot) {
+      module.hot.accept('./app', ()=> {
+        rootElement.render(<Сomponent/>);
+      })
+  }
+};
+
+export const unmount = () => {
+  rootElement.unmount();
+};