TS7 upgrade + write to TS over JS

frontend/src/hooks/useTheme.ts

@@ -1,8 +1,13 @@
 import { useEffect, useState } from "react";
 import { getInitialTheme, applyTheme, toggleTheme } from "../utils/theme";
 
-export function useTheme() {
-    const [theme, setTheme] = useState(getInitialTheme);
+interface UseThemeReturn {
+    theme: string;
+    toggleTheme: () => void;
+}
+
+export function useTheme(): UseThemeReturn {
+    const [theme, setTheme] = useState<string>(getInitialTheme);
 
     useEffect(() => {
         applyTheme(theme);