Vite - Dark Mode

Copyimport { createContext, useContext, useEffect, useState } from "react";
 
type Theme = "dark" | "light" | "system";
 
type ThemeProviderProps = {
  children: React.ReactNode;
  defaultTheme?: Theme;
  storageKey?: string;
};
 
type ThemeProviderState = {
  theme: Theme;
  setTheme: (theme: Theme) => void;
};
 
const initialState: ThemeProviderState = {
  theme: "system",
  setTheme: () => null,
};
 
const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
 
export function ThemeProvider({
  children,
  defaultTheme = "system",
  storageKey = "vite-ui-theme",
  ...props
}: ThemeProviderProps) {
  const [theme, setTheme] = useState<Theme>(
    () => (localStorage.getItem(storageKey) as Theme) || defaultTheme
  );
 
  useEffect(() => {
    const root = window.document.documentElement;
 
    root.classList.remove("light", "dark");
 
    if (theme === "system") {
      const systemTheme = window.matchMedia("(prefers-color-scheme: dark)").matches
        ? "dark"
        : "light";
 
      root.classList.add(systemTheme);
      return;
    }
 
    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;
};

Copyimport { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import "./index.css";
import App from "./App.tsx";
import { ThemeProvider } from "@/providers/ThemeProvider";
 
createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <ThemeProvider defaultTheme="dark" storageKey="vite-ui-theme">
      <App />
    </ThemeProvider>
  </StrictMode>
);

Copyimport { IconMoonStars, IconSun } from "@tabler/icons-react";
 
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { useTheme } from "@/providers/ThemeProvider";
 
export function ThemeToggle() {
  const { setTheme } = useTheme();
 
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="outline" size="icon">
          <IconSun className="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
          <IconMoonStars className="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
          <span className="sr-only">Toggle theme</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme("light")}>Light</DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("dark")}>Dark</DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme("system")}>System</DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  );
}