Upgrade to react 18

src/chart.tsx

@@ -404,7 +404,7 @@ class ChartWrapper {
 }
 
 function usePrevious<T>(value: T): T | undefined {
-  const ref = useRef<T>();
+  const ref = useRef<T | undefined>(undefined);
   useEffect(() => {
     ref.current = value;
   });