feat: start of monorepo

packages/website/src/hooks/useDelta.ts

@@ -0,0 +1,11 @@
+import { useEffect, useRef } from 'react';
+
+export function useDelta(value: number) {
+  const lastValue = useRef(value);
+
+  useEffect(() => {
+    lastValue.current = value;
+  });
+
+  return value - lastValue.current;
+}