Apply preset-19 codemod

```bash
$ npx types-react-codemod.cjs preset-19 .
Processing 230 files...
Results:
0 errors
227 unmodified
0 skipped
3 ok
```

Author: eps1lon

examples/auth/src/App.tsx

@@ -10,6 +10,8 @@ import {
 } from "react-router-dom";
 import { fakeAuthProvider } from "./auth";
 
+import type { JSX } from "react";
+
 export default function App() {
   return (
     <AuthProvider>

packages/react-router-dom/index.tsx

@@ -759,7 +759,7 @@ export function BrowserRouter({
   future,
   window,
 }: BrowserRouterProps) {
-  let historyRef = React.useRef<BrowserHistory>();
+  let historyRef = React.useRef<BrowserHistory>(undefined);
   if (historyRef.current == null) {
     historyRef.current = createBrowserHistory({ window, v5Compat: true });
   }
@@ -810,7 +810,7 @@ export function HashRouter({
   future,
   window,
 }: HashRouterProps) {
-  let historyRef = React.useRef<HashHistory>();
+  let historyRef = React.useRef<HashHistory>(undefined);
   if (historyRef.current == null) {
     historyRef.current = createHashHistory({ window, v5Compat: true });
   }

packages/react-router/lib/components.tsx

@@ -222,7 +222,7 @@ export function MemoryRouter({
   initialIndex,
   future,
 }: MemoryRouterProps): React.ReactElement {
-  let historyRef = React.useRef<MemoryHistory>();
+  let historyRef = React.useRef<MemoryHistory>(undefined);
   if (historyRef.current == null) {
     historyRef.current = createMemoryHistory({
       initialEntries,