removing unused imports, creating a file for global decelaration

src/global.d.ts

@@ -0,0 +1,12 @@
+import React from 'react';
+
+declare global {
+  namespace JSX {
+    interface Element extends React.ReactElement<any, any> {}
+  }
+
+  interface Window {
+    google: typeof google;
+  }
+  const google: any;
+}