cal.pub0.org/packages/lib/hooks/useTheme.tsx

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import { useTheme as useNextTheme } from "next-themes";
import { useEffect } from "react";
import { useEmbedTheme } from "@calcom/embed-core/embed-iframe";
import type { Maybe } from "@calcom/trpc/server";
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/**
* It should be called once per route and only if you want to use app configured theme. System only theme works automatically by using ThemeProvider
* Calling it without a theme will just returns the current theme.
* It handles embed configured theme as well.
*/
export default function useTheme(themeToSet?: Maybe<string>) {
const { resolvedTheme, setTheme, forcedTheme, theme: activeTheme } = useNextTheme();
const embedTheme = useEmbedTheme();
useEffect(() => {
// If themeToSet is not provided the purpose is to just return the current the current values
if (themeToSet === undefined) return;
// Embed theme takes precedence over theme configured in app. This allows embeds to be themed differently
const finalThemeToSet = embedTheme || themeToSet || "system";
if (!finalThemeToSet || finalThemeToSet === activeTheme) return;
setTheme(finalThemeToSet);
}, [themeToSet, setTheme, embedTheme, activeTheme]);
return {
resolvedTheme,
setTheme,
forcedTheme,
activeTheme,
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};
}