yaak-mountain-loop/apps/yaak-client/hooks/usePreferredAppearance.ts

import { useEffect, useState } from "react";
import type { Appearance } from "@yaakapp-internal/theme";
import {
  getCSSAppearance,
  getSystemAppearance,
  subscribeToPreferredAppearance,
} from "@yaakapp-internal/theme";

export function usePreferredAppearance() {
  const [preferredAppearance, setPreferredAppearance] = useState<Appearance>(
    getSystemAppearance() ?? getCSSAppearance(),
  );
  useEffect(() => subscribeToPreferredAppearance(setPreferredAppearance), []);
  return preferredAppearance;
}