re-structure to monorepo.

packages/webapp/src/hooks/utils/usePrevious.tsx

@@ -0,0 +1,16 @@
+// @ts-nocheck
+import { useRef, useEffect } from 'react';
+
+
+// Hook
+export function usePrevious(value) {
+  // The ref object is a generic container whose current property is mutable ...
+  // ... and can hold any value, similar to an instance property on a class
+  const ref = useRef();
+  // Store current value in ref
+  useEffect(() => {
+    ref.current = value;
+  }, [value]); // Only re-run if value changes
+  // Return previous value (happens before update in useEffect above)
+  return ref.current;
+}