Converted some left-over JavaScript file to TypeScript

Summary: Found some errors in a CI failure originating from a JavaScript file. The horror!

Reviewed By: jknoxville

Differential Revision: D29549998

fbshipit-source-id: 633100ec9a446050bb0c703dcc37e9b132b17198

desktop/app/src/init-fast-refresh.tsx

@@ -0,0 +1,53 @@
+/**
+ * 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.
+ *
+ * @format
+ */
+
+import {default as HmrClient} from './HMRClient';
+// @ts-ignore
+import {default as ReactRefreshRuntime} from 'react-refresh/runtime';
+
+HmrClient.setup(
+  'web',
+  '/app/src/init-fast-refresh.bundle',
+  'localhost',
+  '3000',
+  true,
+);
+
+ReactRefreshRuntime.injectIntoGlobalHook(window);
+
+const Refresh = {
+  performFullRefresh(reason: string) {
+    console.log('Perform full refresh', reason);
+    window.location.reload();
+  },
+
+  createSignatureFunctionForTransform:
+    ReactRefreshRuntime.createSignatureFunctionForTransform,
+
+  isLikelyComponentType: ReactRefreshRuntime.isLikelyComponentType,
+
+  getFamilyByType: ReactRefreshRuntime.getFamilyByType,
+
+  register: ReactRefreshRuntime.register,
+
+  performReactRefresh() {
+    if (ReactRefreshRuntime.hasUnrecoverableErrors()) {
+      console.error('Fast refresh - Unrecolverable');
+      window.location.reload();
+      return;
+    }
+    ReactRefreshRuntime.performReactRefresh();
+    console.log('Perform react refresh');
+  },
+};
+
+(require as any).Refresh = Refresh;
+
+// eslint-disable-next-line import/no-commonjs
+require('./init.tsx');