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theme-watcher

v0.3.4

Published

Plug-and-play theme watcher for React SPAs

Downloads

22

Vulnerabilities

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  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

sandersonstabosandersonstabo

Keywords

Readme

theme-watcher

Zero-dependency theme watcher. Works with React, Tailwind, shadcn, or any CSS framework.

Install

npm i theme-watcher

Usage

import { ThemeWatcher, useTheme } from "theme-watcher";

function App() {
  return (
    <>
      <ThemeWatcher />
      <ThemeToggle />
    </>
  );
}

function ThemeToggle() {
  const { resolvedTheme, toggleMode } = useTheme();
  return (
    <button onClick={toggleMode}>
      {resolvedTheme === "dark" ? "Light" : "Dark"}
    </button>
  );
}

<ThemeWatcher /> handles:

  • System preference detection (prefers-color-scheme)
  • localStorage persistence
  • Cross-tab synchronization
  • DOM updates (sets class or data-* attribute on <html>)

API

<ThemeWatcher />

Place once near your app root. Renders nothing.

| Prop | Type | Default | Description | |------|------|---------|-------------| | theme | "light" \| "dark" | - | Force a specific theme (ignores storage/system) | | defaultTheme | "light" \| "dark" \| "system" | "system" | Initial theme when no stored preference | | storageKey | string | "theme" | localStorage key for persistence | | attribute | "class" \| "data-*" | "class" | Attribute set on <html> (e.g., "data-theme") | | enableColorScheme | boolean | true | Set color-scheme CSS property on <html> | | disableTransitionOnChange | boolean | false | Disable CSS transitions during theme change |

useTheme()

Hook for reading and controlling theme state.

| Return | Type | Description | |--------|------|-------------| | theme | "light" \| "dark" \| "system" | Current stored preference | | resolvedTheme | "light" \| "dark" | Actual applied theme (resolves "system" to OS preference) | | systemTheme | "light" \| "dark" | Current OS preference | | setTheme(t) | (t) => void | Set preference ("light", "dark", or "system") | | set(t) | (t) => void | Alias for setTheme | | get() | () => string | Read stored preference directly | | toggleMode() | () => void | Toggle between "light" and "dark" |

Tailwind / shadcn Setup

Set darkMode: "class" in tailwind.config.js. No other configuration needed.

:root {
  --background: #ffffff;
  --foreground: #111111;
}

.dark {
  --background: #111111;
  --foreground: #ffffff;
}

Data Attribute Mode

For CSS frameworks that use data-theme instead of class:

<ThemeWatcher attribute="data-theme" />
:root[data-theme="light"] { /* ... */ }
:root[data-theme="dark"] { /* ... */ }

Behavior

  1. On mount: reads localStorage (falls back to defaultTheme)
  2. If "system": resolves via prefers-color-scheme media query
  3. Applies to <html>: toggles class or sets data attribute
  4. Listens for: OS preference changes, storage events (cross-tab sync)
  5. On change: updates DOM, localStorage, and all useTheme() subscribers