refactor(pwa): migrate client modules to TS (#7421)

packages/docusaurus-plugin-pwa/src/renderReloadPopup.tsx

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+
+const POPUP_CONTAINER_ID = 'pwa-popup-container';
+
+const getContainer = () => document.getElementById(POPUP_CONTAINER_ID);
+
+const createContainer = () => {
+  const container = document.createElement('div');
+  container.id = POPUP_CONTAINER_ID;
+  document.body.appendChild(container);
+  return container;
+};
+
+export default async function renderReloadPopup(props: {
+  onReload: () => void;
+}): Promise<void> {
+  const container = getContainer() || createContainer();
+  const {default: ReloadPopup} = await import(process.env.PWA_RELOAD_POPUP!);
+  ReactDOM.render(<ReloadPopup {...props} />, container);
+}