# Theme switch

A React component in [Beamline](https://beamline.io/)'s [Actions](https://beamline.io/components/actions) category. Live demo: https://beamline.io/components/theme-switch

The light/dark control: the page changes in one of four transitions starting from the button (reveal, eclipse, split, rise), and the icon turns between sun and moon.

## Use it for

- A visible appearance control in settings or an app header.

## Not for

- Products that ship dark only: keep the preference in settings.

## Anatomy

- Button
- sun / moon icon
- label

## Variants

- **variant**: reveal, eclipse, split, rise
- **buttonVariant**: secondary, ghost, outline

## States

- dark
- light
- transitioning

## Keyboard

- Enter / Space switches

## Motion

The new theme is revealed by clipping only the new page snapshot (no stylesheet is added): reveal grows a circle from the button, eclipse closes an even-odd hole into it, split opens from the middle, rise from the bottom; 540 ms (1.5 × considered) on the in-out curve. The icon turns between sun and moon over 280 ms. Reduced motion or no View Transitions: instant swap.

## Props

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `theme` | `"light" \| "dark"` | — |  |
| `onThemeChange` | `(next, variant, trigger) => void` | — |  |
| `variant` | `ThemeSwitchVariant` | `"reveal"` |  |
| `label` | `string` | `"Theme"` |  |
| `iconOnly` | `boolean` | — |  |
| `transitionTheme(apply, variant, from)` | `function` | — | the transition alone, for your own control |
| `style / ref` | `CSSProperties / native Ref` | — | native HTMLButtonElement |
| `classNames` | `ThemeSwitchClassNames` | — |  |

## Dependencies

`lucide-react`, `motion`

## Import

```tsx
import { ThemeSwitch } from "@/components/theme-switch/theme-switch";
```

## Get it

Theme switch is part of Beamline: 190 React components and screens your coding agent (Claude Code, Codex, Cursor or any MCP client) installs into your app through Beamline's MCP server, as a ready-built package or as plain React source you can change. $49 one payment (regular $200), no subscription, a year of updates, one licence for your whole team. [Get Beamline](https://beamline.io/checkout?pack=complete) · [Connect your agent](https://beamline.io/connect)

## More in Actions

- [Button](https://beamline.io/components/button): The action control: five weights and a brand fill, a buy/sell tone, sm/md/lg and a 44 px touch size, icon-only, a loading state that keeps its size and…
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- [Copy button](https://beamline.io/components/copy-button): Copies a value and confirms in place: the icon becomes a check and the label says Copied; a refused copy says so instead of pretending.
- [Hold to confirm](https://beamline.io/components/hold-to-confirm): Confirms a costly action by holding instead of clicking: a fill sweeps across while held and drains if let go early; pointer, touch, Space and Enter all…
- [Split button](https://beamline.io/components/split-button): One obvious action joined to a menu of close alternatives; both halves are real buttons and the menu uses the shared menu rows.
- [Swipe actions](https://beamline.io/components/swipe-actions): Row actions behind a swipe on touch screens, mirrored in a menu at the row's end for pointer and keyboard; a full swipe runs the edge action.