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themeflip

v0.2.0

Published

A lightweight React theme toggle for light, dark, and system themes.

Vulnerabilities

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Links

Git

Maintainers

disfordavedisfordave

Keywords

Readme

themeflip

A lightweight React theme toggle for light, dark, and system themes.

Requirements

  • React 18+

Install

npm install themeflip

Usage

import { ThemeToggle } from "themeflip";

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

For Tailwind dark mode:

<ThemeToggle addDarkClass />

Styling

themeflip is unstyled, so you can use Tailwind, vanilla CSS, CSS Modules, or any other styling system.

<ThemeToggle
  className="theme-toggle"
  buttonClassName="theme-toggle-button"
  activeButtonClassName="active"
/>

Data attributes

The component exposes data attributes so you can style it without depending on a specific CSS framework.

[data-theme-toggle] {
  display: flex;
}

[data-theme-option][data-active="true"] {
  font-weight: bold;
}

[data-theme-indicator][data-theme="dark"] {
  transform: translateX(200%);
}

Available attributes include:

  • data-theme-toggle — root element
  • data-theme-indicator — active-theme indicator
  • data-theme="system | light | dark" — current selected theme
  • data-theme-option="system | light | dark" — individual theme button
  • data-active="true | false" — whether a theme button is selected

Props

  • defaultTheme — "light", "dark", or "system"
  • storageKey — localStorage key, defaults to "theme"
  • addDarkClass — adds/removes the dark class on <html>
  • onThemeChange — called when the selected theme changes
  • system, light, dark — customize labels and icons
  • className
  • indicatorClassName
  • buttonClassName
  • activeButtonClassName

Framework notes

Avoiding theme flicker

To apply the correct theme before React loads, you can optionally add this script near the top of your <head>:

<script>
  (function () {
    try {
      var t = localStorage.getItem("theme");
      var d =
        t === "dark" ||
        (t !== "light" &&
          window.matchMedia("(prefers-color-scheme: dark)").matches);

      document.documentElement.classList.toggle("dark", d);
    } catch (e) {}
  })();
</script>

This is useful when using addDarkClass and helps avoid a brief light-theme flash while the page loads.

If you use a custom storageKey, replace "theme" in the script with the same key.

Astro

When using Astro, render the toggle as a client-only React island:

<ThemeToggle client:only="react" />

Breaking changes (v0.2.0)

  • Changed the default theme from "auto" to "system"
  • Renamed the auto prop to system for consistency

License

MIT