@master/theme-mode.svelte

A lightweight utility for switching CSS theme modes

Try it out on the Master CSS documentation site.

Features

Vanilla, Next, React, Vue, and Master CSS are available:

⚡️ Ultra-lightweight ~1.2KB
🌈 Switch between light, dark, and system
💖 Sync with system theme preferences
💾 Store the user's preference in localStorage
💫 Access theme preferences and modes through context
🧩 Built-in "use client" directive

Why should I use this?

The prefers-color-scheme cannot force override to the specified color mode. Once you want to switch themes, you cannot use @media (prefers-color-scheme: dark).

https://stackoverflow.com/questions/56300132/how-to-override-css-prefers-color-scheme-setting

How does this work?

This package automatically switches themes using class="" and color-scheme:; that's it.

<html class="dark" style="color-scheme: dark">
    <body>
        <h1 class="bg:black@dark bg:white@light">Hello World</h1>
    </body>
</html>

To view the source code examples:

Getting Started

Install the package depending on your framework.

Vanilla

npm install theme-mode

import ThemeMode from 'theme-mode'

const themeMode = new ThemeMode().init()

// Set `preference` anywhere to switch theme modes.
themeMode.preference = 'dark'

React

npm install @master/theme-mode.react

import ThemeModeProvider from '@master/theme-mode.react'

export default function App({ children }) {
    return (
        <ThemeModeProvider preference='system'>
            {children}
        </ThemeModeProvider>
    )
}

Vue

npm install @master/theme-mode.vue

<script setup lang="ts">
import ThemeModeProvider from '@master/theme-mode.vue'
</script>

<template>
    <ThemeModeProvider preference="system">
        <slot></slot>
    </ThemeModeProvider>
</template>

Svelte

npm install @master/theme-mode.svelte

<script lang="ts">
    import ThemeModeProvider from '@master/theme-mode.svelte';
</script>

<ThemeModeProvider preference="system">
    ...
</ThemeModeProvider>

Basic usage

Default to light or dark mode

You can set the default theme mode when the user has not set a theme preference, such as common light or dark mode.

<ThemeModeProvider preference="dark">...</ThemeModeProvider>

Rendered as:

<html class="dark" style="color-scheme: dark">…</html>

Default based on the system preference

Automatically switches modes based on the user's system preference.

<ThemeModeProvider preference="system">...</ThemeModeProvider>

Rendered as:

<html class="light" style="color-scheme: light">…</html>
<!-- or -->
<html class="dark" style="color-scheme: dark">…</html>

Note: CSS only supports light and dark modes for system preferences.

Sync the user's preference to `localStorage`

By default options.store is set to 'theme-preference', which uses this key to set local storage when the preference is changed.

In this way, the theme preference set last time will be applied when the user visits or refreshes the website again.

To disable local storage, set it to false.

<ThemeModeProvider store={false}>...</ThemeModeProvider>

Apply styles based on theme modes

You can now create selector-driven CSS themes using tools like Master CSS.

<html class="light" style="color-scheme: light">
    <body>
        <div class="block@dark" hidden>Dark</div>
        <div class="block@light" hidden>Light</div>
        <div class="block@christmas" hidden>Christmas</div>
    </body>
</html>

Create a theme-switching select

React

import { useThemeMode } from '@master/theme-mode.react'

export default function ThemeModeSelect() {
    const themeMode = useThemeMode()
    return (
        <button>
            {themeMode.value === 'dark' ? '🌜' : '☀️'} {themeMode.preference}
            <select className="abs full inset:0 opacity:0"
                value={themeMode.preference}
                onChange={(event) => themeMode.preference = event.target.value}>
                <option value="light">☀️ Light</option>
                <option value="dark">🌜 Dark</option>
                <option value="system">System</option>
            </select>
        </button>
    )
}

Vue

<script setup lang="ts">
import { inject } from 'vue'
const themeMode = inject<any>('theme-mode')
</script>

<template>
    <button class="px:5x r:2x font:18 h:48 bg:slate-10@light bg:gray-80@dark fg:strong rel">
        {{ themeMode.value === 'dark' ? '🌜' : '☀️' }} {{ themeMode.preference }}
        <select class="abs full inset:0 opacity:0" v-model="themeMode.preference">
            <option value="light">☀️ Light</option>
            <option value="dark">🌜 Dark</option>
            <option value="system">System</option>
        </select>
    </button>
</template>

Svelte

<script lang="ts">
    import { getThemeMode } from "@master/theme-mode.svelte";
    const themeMode = getThemeMode();
</script>

<span id="value">{$themeMode.value}</span>
<span id="preference">{$themeMode.preference}</span>
<select class="abs full inset:0 opacity:0" bind:value={$themeMode.preference}>
    <option value="light">☀️ Light</option>
    <option value="dark">🌜 Dark</option>
    <option value="system">System</option>
</select>

Avoid FOUC

If you've pre-rendered your CSS styles to the page to improve the page loading and first-render experience, it's crucial to initialize the theme mode in advance.

By default, three modules of minified advanced initial scripts for different default themes are exported:

theme-mode/pre-init: https://github.com/master-co/theme-mode/tree/main/packages/core/src/pre-init.iife.min.ts
theme-mode/pre-init-light: https://github.com/master-co/theme-mode/tree/main/packages/core/src/pre-init-light.iife.min.ts
theme-mode/pre-init-dark: https://github.com/master-co/theme-mode/tree/main/packages/core/src/pre-init-dark.iife.min.ts

You have to use the build tool to inject these original scripts into HTML <head>, taking Next.js as an example:

import PRE_INIT_THEME_MODE_SCRIPT from '!!raw-loader!theme-mode/pre-init';

export default async function RootLayout({ children }: {
    children: JSX.Element
}) {
    return (
        <html suppressHydrationWarning>
            <head>
                <script dangerouslySetInnerHTML={{ __html: PRE_INIT_THEME_MODE_SCRIPT }}></script>
                ...
            </head>
            ...
        </html>
    )
}

Or copy them directly:

const preference = localStorage.getItem('theme-preference') || 'system';
const value = preference === 'system'
    ? matchMedia('(prefers-color-scheme:dark)').matches ? 'dark' : 'light'
    : preference;

document.documentElement.classList.add(value);
if (['dark', 'light'].includes(value)) document.documentElement.style.colorScheme = value;

Those JS resources cannot be loaded from external because this is a critical script for the first painting of the page.

Options

`.preference`

Specify the default theme preference.

Default: undefined
Value: 'dark' | 'light' | 'system' | string

`.store`

Enable local storage and specify the key for localStorage.

Default: 'theme-preference'
Value: 'theme-preference' | string | false

Properties

`themeMode.preference`

Set or get the current theme preference.

Default: undefined
Value: 'dark' | 'light' | 'system' | string

`themeMode.value`

Set or get the current theme mode.

Default: undefined
Value: 'dark' | 'light' | string

`themeMode.storage`

Get the currently stored theme preference.

Default: undefined
Value: 'dark' | 'light' | string

`themeMode.systemPreference`

Get the theme mode of the current system

Default: undefined
Value: 'dark' | 'light' | string

Methods

`themeMode.init()`

Initialize the default theme mode. This is usually performed after the DOM has been initialized.

`themeMode.destroy()`

Destroy the theme mode, including removing media query listeners.

Community

The Master community can be found here:

Discuss on GitHub - Ask questions, voice ideas, and do any other discussion
Join our Discord Server - Casually chat with other people using the language ^{_{✓ 中文}}

_{Our 《 Code of Conduct 》 applies to all Master community channels.}

Contributing

Please see our CONTRIBUTING for workflow.

@master/theme-mode.svelte

Features

Why should I use this?

How does this work?

Getting Started

Vanilla

React

Vue

Svelte

Basic usage

Default to light or dark mode

Default based on the system preference

Sync the user's preference to localStorage

Apply styles based on theme modes

Create a theme-switching select

React

Vue

Svelte

Avoid FOUC

Options

.preference

.store

Properties

themeMode.preference

themeMode.value

themeMode.storage

themeMode.systemPreference

Methods

themeMode.init()

themeMode.destroy()

Community

Contributing

Readme

Keywords

Package Sidebar

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Sync the user's preference to `localStorage`

`.preference`

`.store`

`themeMode.preference`

`themeMode.value`

`themeMode.storage`

`themeMode.systemPreference`

`themeMode.init()`

`themeMode.destroy()`

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