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import { createContext, useContext, useEffect, useState } from "react";
type Theme = "dark" | "light";
type ThemeProviderProps = {
children: React.ReactNode;
defaultTheme?: Theme;
storageKey?: string;
};
type ThemeProviderState = {
theme: Theme;
setTheme: (theme: Theme) => void;
};
const initialState: ThemeProviderState = {
theme: "light",
setTheme: () => null,
};
const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
export function ThemeProvider({
children,
defaultTheme = "light",
storageKey = "ui-theme",
...props
}: ThemeProviderProps) {
const [theme, setTheme] = useState<Theme>(() => {
if (typeof window !== "undefined") {
return (localStorage.getItem(storageKey) as Theme) || defaultTheme;
}
return defaultTheme;
});
useEffect(() => {
const root = window.document.documentElement;
root.classList.remove("light", "dark");
root.classList.add(theme);
}, [theme]);
const value = {
theme,
setTheme: (theme: Theme) => {
localStorage.setItem(storageKey, theme);
setTheme(theme);
},
};
return (
<ThemeProviderContext.Provider {...props} value={value}>
{children}
</ThemeProviderContext.Provider>
);
}
export const useTheme = () => {
const context = useContext(ThemeProviderContext);
if (context === undefined)
throw new Error("useTheme must be used within a ThemeProvider");
return context;
}; |