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code/app/app-rn2/app/_layout.tsx

@@ -0,0 +1,14 @@
+import { useColorScheme } from "@/hooks/use-color-scheme";
+import { Stack } from "expo-router";
+import { useEffect } from "react";
+import "@/styles/global.css";
+
+export default function RootLayout() {
+  const colorScheme = useColorScheme();
+
+  useEffect(() => {
+    console.log(colorScheme);
+  }, [colorScheme]);
+
+  return <Stack />;
+}