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