make sliders work!

packages/react/src/hooks/useWidgets.mjs

@@ -0,0 +1,13 @@
+import { useEffect, useState } from 'react';
+import { updateWidgets } from '@strudel/codemirror';
+
+// i know this is ugly.. in the future, repl needs to run without react
+export function useWidgets(view) {
+  const [widgets, setWidgets] = useState([]);
+  useEffect(() => {
+    if (view) {
+      updateWidgets(view, widgets);
+    }
+  }, [view, widgets]);
+  return { widgets, setWidgets };
+}