Prettier for formatting and some stricter linting rules

frontend/src/App.tsx

@@ -1,10 +1,10 @@
-import { useState } from 'react'
-import reactLogo from './assets/react.svg'
-import viteLogo from '/vite.svg'
-import './App.css'
+import { useState } from "react";
+import reactLogo from "./assets/react.svg";
+import viteLogo from "/vite.svg";
+import "./App.css";
 
-function App() {
-  const [count, setCount] = useState(0)
+function App(): JSX.Element {
+  const [count, setCount] = useState(0);
 
   return (
     <>
@@ -18,7 +18,11 @@ function App() {
       </div>
       <h1>Vite + React</h1>
       <div className="card">
-        <button onClick={() => setCount((count) => count + 1)}>
+        <button
+          onClick={() => {
+            setCount((count) => count + 1);
+          }}
+        >
           count is {count}
         </button>
         <p>
@@ -29,7 +33,7 @@ function App() {
         Click on the Vite and React logos to learn more
       </p>
     </>
-  )
+  );
 }
 
-export default App
+export default App;

frontend/src/main.tsx

@@ -1,10 +1,12 @@
-import React from 'react'
-import ReactDOM from 'react-dom/client'
-import App from './App.tsx'
-import './index.css'
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App.tsx";
+import "./index.css";
 
-ReactDOM.createRoot(document.getElementById('root')!).render(
+const root = document.getElementById("root") ?? document.createElement("div");
+
+ReactDOM.createRoot(root).render(
   <React.StrictMode>
     <App />
   </React.StrictMode>,
-)
+);