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nextjs-themes

Unleash the Power of React Server Components! Use multiple themes on your site with confidence, without losing any advantages of React Server Components.


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Nextjs-Themes Version codecov Downloads npm bundle size Publish to npm and GitHub Contact me on Codementor

This is a sister package of react18-themes. Initially we targeted only Next.js and thus this package was named nextjs-themes. However, we have expanded support for Vite and Remix as well. And thus published a package with more generic name, react18-themes.

We recommend using react18-themes for latest updates. Though this package is also maintained with specific focus on Next.js, all the functionality of this package along with extended support for other build tools is available in react18-themes

🤟 👉 Unleash the Power of React Server Components

This project is inspired by next-themes. Next-themes is an awesome package, however, it requires wrapping everything in a provider. The provider has to be a client component as it uses hooks. And thus, it takes away all the benefits of Server Components.

nextjs-themes removes this limitation and enables you to unleash the full power of React 18 Server Components. In addition, more features are coming up soon... Stay tuned!

  • ✅ Fully Treeshakable (import from nextjs-themes/client/component)
  • ✅ Designed for excellence
  • ✅ Full TypeScript Support
  • ✅ Unleash the full power of React18 Server components
  • ✅ Works with all build systems/tools/frameworks for React18
  • ✅ Perfect dark mode in 2 lines of code
  • ✅ System setting with prefers-color-scheme
  • ✅ Themed browser UI with color-scheme
  • ✅ Support for Next.js 13 & Next.js 14 appDir
  • ✅ Sync theme across tabs and windows
  • ✅ Disable flashing when changing themes
  • ✅ Force pages to specific themes
  • ✅ Class or data attribute selector
  • ✅ Manipulate theme via useTheme hook
  • ✅ Doccumented with Typedoc (Docs)

Check out the live example.

Install

$ pnpm add nextjs-themes
# or
$ npm install nextjs-themes
# or
$ yarn add nextjs-themes

Want Lite Version? npm bundle size Version Downloads

$ pnpm add nextjs-themes-lite
# or
$ npm install nextjs-themes-lite
# or
$ yarn add nextjs-themes-lite

You need Zustand as a peer-dependency

To do

  • Update examples

Usage

SPA (e.g., Vite, CRA) and Next.js pages directory (No server components)

The best way is to add a Custom App to use by modifying _app as follows:

Adding dark mode support takes 2 lines of code:

import { ThemeSwitcher } from "nextjs-themes";

function MyApp({ Component, pageProps }) {
	return (
		<>
			<ThemeSwitcher forcedTheme={Component.theme} />
			<Component {...pageProps} />
		</>
	);
}

export default MyApp;

⚡🎉Boom! Just a couple of lines and your dark mode is ready!

Check out examples for advanced usage.

With Next.js app router (Server Components)

Prefer static generation over SSR - No wrapper component

If your app is mostly serving static content, you do not want the overhead of SSR. Use NextJsSSGThemeSwitcher in this case. When using this approach, you need to use CSS general sibling Combinator (~) to make sure your themed CSS is properly applied. See (HTML & CSS)[#html--css].

Update your app/layout.jsx to add ThemeSwitcher from nextjs-themes, and NextJsSSGThemeSwitcher from nextjs-themes/server. NextJsSSGThemeSwitcher is required to avoid flash of un-themed content on reload.

// app/layout.jsx
import { ThemeSwitcher } from "nextjs-themes";
import { NextJsSSGThemeSwitcher } from "nextjs-themes/server/nextjs";

export default function Layout({ children }) {
	return (
		<html lang="en">
			<head />
			<body>
				/** use NextJsSSGThemeSwitcher as first element inside body */
				<NextJsSSGThemeSwitcher />
				<ThemeSwitcher />
				{children}
			</body>
		</html>
	);
}

Woohoo! You just added multiple theme modes and you can also use Server Component! Isn't that awesome!

Prefer SSR over SSG - Use wrapper component

If your app is serving dynamic content and you want to utilize SSR, continue using ServerSideWrapper component to replace html tag in layout.tsx file.

Update your app/layout.jsx to add ThemeSwitcher and ServerSideWrapper from nextjs-themes. ServerSideWrapper is required to avoid flash of un-themed content on reload.

// app/layout.jsx
import { ThemeSwitcher } from "nextjs-themes";
import { ServerSideWrapper } from "nextjs-themes/server/nextjs";

export default function Layout({ children }) {
	return (
		<ServerSideWrapper tag="html" lang="en">
			<head />
			<body>
				<ThemeSwitcher />
				{children}
			</body>
		</ServerSideWrapper>
	);
}

Woohoo! You just added dark mode and you can also use Server Component! Isn't that awesome!

HTML & CSS

That's it, your Next.js app fully supports dark mode, including System preference with prefers-color-scheme. The theme is also immediately synced between tabs. By default, nextjs-themes modifies the data-theme attribute on the html element, which you can easily use to style your app:

:root {
	/* Your default theme */
	--background: white;
	--foreground: black;
}

[data-theme="dark"] {
	--background: black;
	--foreground: white;
}

// v2 onwards when using NextJsSSGThemeSwitcher, we need to use CSS Combinators
[data-theme="dark"] ~ * {
	--background: black;
	--foreground: white;
}

useTheme

In case your components need to know the current theme and be able to change it. The useTheme hook provides theme information:

import { useTheme } from "nextjs-themes";

const ThemeChanger = () => {
	/* you can also improve performance by using selectors
	 * const [theme, setTheme] = useTheme(state => [state.theme, state.setTheme]);
	 */
	const { theme, setTheme } = useTheme();

	return (
		<div>
			The current theme is: {theme}
			<button onClick={() => setTheme("light")}>Light Mode</button>
			<button onClick={() => setTheme("dark")}>Dark Mode</button>
		</div>
	);
};

Force per page theme and color-scheme

Next.js app router

import { ForceTheme } from "nextjs-themes";

function MyPage() {
	return (
		<>
			<ForceTheme theme={"my-theme"} />
			...
		</>
	);
}

export default MyPage;

Next.js pages router

For pages router, you have 2 options. One is the same as the app router and the other option which is compatible with next-themes is to add theme to your page component as follows.

function MyPage() {
	return <>...</>;
}

MyPage.theme = "my-theme";

export default MyPage;

In a similar way, you can also force color scheme.

Forcing color scheme will apply your defaultDark or defaultLight theme, configurable via hooks.

Migrating from v1 to v2

Motivation:

For server side syncing, we need to use cookies and headers. This means that this component and its children can not be static. They will be rendered server side for each request. Thus, we are avoiding the wrapper. Now, only the NextJsSSGThemeSwitcher will be rendered server side for each request and rest of your app can be server statically.

Take care of the following while migrating to v2.

  • No changes required for projects not using Next.js app router or server components other than updating cookies policy if needed.
  • The persistent storage is realized with cookies in place of localStorage. (You might want to update cookies policy accordingly.)
  • We have provided NextJsSSGThemeSwitcher in addition to ServerSideWrapper for Next.js. You no longer need to use a wrapper component which broke static generation and forced SSR.
  • Visit With Next.js app router (Server Components)

Migrating from v0 to v1

  • defaultDarkTheme is renamed to darkTheme
  • setDefaultDarkTheme is renamed to setDarkTheme
  • defaultLightTheme is renamed to lightTheme
  • setDefaultLightTheme is renamed to setLightTheme

Docs

Typedoc

🤩 Don't forger to start this repo!

Want handson course for getting started with Turborepo? Check out React and Next.js with TypeScript

License

Licensed as MIT open source.

Note: This package uses cookies to sync theme with server components


with 💖 by Mayank Kumar Chaudhari

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Package last updated on 02 Dec 2023

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