# Switch (Notchset): prompt.md (v2.0.0)

- id: `switch` · version 2.0.0 · component · free
- category: Inputs
- build: one set of files for every shadcn style
- install: `npx shadcn@latest add https://notchset.dev/r/switch.json`
- npm dependencies: @base-ui/react@^1
- registry dependencies: utils, https://notchset.dev/r/notchset-foundation.json
- docs: https://notchset.dev/components/switch
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A setting that takes effect the moment it flips, with no Save. Off is a quiet track, on is ink. Its children are its label, and on touch screens the hit area grows to 40px..

## Build it
- Stack: React 18.3 or 19, TypeScript, Tailwind CSS v4 utility classes on the foundation's roles, a components.json (imports use its aliases).
- Packages: `@base-ui/react@^1`.
- Files: `components/ui/notchset/switch.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`.
- Builds: one set of files, the same for every shadcn style.
- Exports to keep: `Switch`, and every exported type.
- CSS: the install adds the notchset foundation (its roles, keyframes and motion switch, reading your shadcn tokens for colour) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- This item reads `--ns-ease`, `--ns-ink`, `--ns-ink-4`, `--ns-panel`, `--ns-signal`, `--ns-switch-h`, `--ns-switch-w`.
- Retune it (on any ancestor) with the foundation's roles and hooks: `--ns-bad`, `--ns-bad-ink`, `--ns-band`, `--ns-band-edge`, `--ns-band-grade`, `--ns-band-optimal`, `--ns-beat`, `--ns-bezel`, `--ns-canvas`, `--ns-cat-1`, `--ns-cat-2`, `--ns-cat-3`, `--ns-cat-4`, `--ns-cat-5`, `--ns-cat-6`, `--ns-check`, `--ns-chip`, `--ns-control`, `--ns-control-pad`, `--ns-control-sm`, `--ns-deep`, `--ns-deep-ink`, `--ns-deep-ink-2`, `--ns-deep-line`, `--ns-dialog`, `--ns-dialog-lg`, `--ns-dialog-sm`, `--ns-ease`, `--ns-ease-in`, `--ns-ease-panel`, `--ns-ease-pop`, `--ns-field`, `--ns-flood-arc`, `--ns-flood-aurora`, `--ns-flood-behind-1`, `--ns-flood-behind-2`, `--ns-flood-bloom`, `--ns-flood-deep`, `--ns-flood-dial-bloom`, `--ns-flood-glass`, `--ns-flood-grain`, `--ns-flood-image`, `--ns-flood-ink`, `--ns-flood-ink-low`, `--ns-flood-light`, `--ns-flood-mid`, `--ns-flood-pale`, `--ns-flood-pane`, `--ns-flood-pane-edge`, `--ns-flood-pill-ink`, `--ns-flood-ribbon`, `--ns-flood-ribbon-core`, `--ns-flood-shadow`, `--ns-flood-sheen`, `--ns-flood-wash`, `--ns-font-body`, `--ns-font-display`, `--ns-font-mono`, `--ns-font-script`, `--ns-glass`, `--ns-glass-blur`, `--ns-glass-shadow`, `--ns-glow`, `--ns-grain`, `--ns-gutter`, `--ns-header`, `--ns-heat`, `--ns-hover`, `--ns-ink`, `--ns-ink-2`, `--ns-ink-3`, `--ns-ink-4`, `--ns-leading`, `--ns-lift`, `--ns-light-1`, `--ns-light-2`, `--ns-light-3`, `--ns-light-spread`, `--ns-light-strength`, `--ns-line`, `--ns-line-soft`, `--ns-lit-edge`, `--ns-menu-dy`, `--ns-menu-row`, `--ns-mesh`, `--ns-mesh-frost`, `--ns-ok`, `--ns-ok-ink`, `--ns-orb-body`, `--ns-orb-cool`, `--ns-orb-core`, `--ns-orb-dawn`, `--ns-orb-deep`, `--ns-orb-edge`, `--ns-orb-grain`, `--ns-orb-ground`, `--ns-orb-halo`, `--ns-orb-inner`, `--ns-orb-key`, `--ns-orb-lift`, `--ns-orb-limb`, `--ns-orb-limb-from`, `--ns-orb-rim`, `--ns-orb-skin-hi`, `--ns-orb-skin-lo`, `--ns-orb-skin-mid`, `--ns-orb-warm`, `--ns-panel`, `--ns-panel-w`, `--ns-prism-edge`, `--ns-prism-glint`, `--ns-prism-sheen`, `--ns-prism-tint`, `--ns-pulse`, `--ns-radius`, `--ns-radius-card`, `--ns-radius-full`, `--ns-radius-lg`, `--ns-radius-sm`, `--ns-radius-xl`, `--ns-raised`, `--ns-range`, `--ns-row`, `--ns-row-compact`, `--ns-segment`, `--ns-selected`, `--ns-series`, `--ns-series-core`, `--ns-series-lilac`, `--ns-series-tint`, `--ns-shadow-dialog`, `--ns-shadow-float`, `--ns-shadow-panel`, `--ns-sheet`, `--ns-sheet-bottom`, `--ns-side`, `--ns-signal`, `--ns-sleep-awake`, `--ns-sleep-deep`, `--ns-sleep-light`, `--ns-sleep-rem`, `--ns-space-1`, `--ns-space-2`, `--ns-space-3`, `--ns-space-4`, `--ns-space-5`, `--ns-space-6`, `--ns-space-8`, `--ns-space-section`, `--ns-stack-on`, `--ns-standing-critical`, `--ns-standing-in`, `--ns-standing-out`, `--ns-state-doing`, `--ns-state-done`, `--ns-state-review`, `--ns-state-todo`, `--ns-switch-h`, `--ns-switch-w`, `--ns-text-body`, `--ns-text-control`, `--ns-text-display`, `--ns-text-figure`, `--ns-text-headline`, `--ns-text-hero`, `--ns-text-lede`, `--ns-text-meta`, `--ns-text-page`, `--ns-text-record`, `--ns-text-small`, `--ns-text-strong`, `--ns-text-sub`, `--ns-text-title`, `--ns-tile-shadow`, `--ns-time-born`, `--ns-time-color`, `--ns-time-dialog`, `--ns-time-menu`, `--ns-time-page`, `--ns-time-panel`, `--ns-time-toast`, `--ns-tint`, `--ns-tint-ink`, `--ns-toast-bottom`, `--ns-toast-left`, `--ns-touch`, `--ns-tracking-display`, `--ns-tracking-headline`, `--ns-warn`, `--ns-warn-ink`, `--ns-wash-clay`, `--ns-wash-dusk`, `--ns-wash-graphite`, `--ns-wash-ink`, `--ns-wash-sage`, `--ns-wash-sand`, `--ns-weight-light`, `--ns-weight-medium`, `--ns-weight-regular`, `--ns-weight-strong`, `--ns-well`.
- Never add Tailwind colour classes inside the component.

```tsx
import { Switch } from "@/components/ui/notchset/switch";
```

## Parts
- A single export that takes props.

## Match the original
- Read `components/ui/notchset/switch.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when

### Not when

## Mistakes
- Recreating the component instead of installing it

## Usage

```tsx
"use client";
import { Switch } from "@/components/ui/notchset/switch";

export default function SwitchDemo() {
  return (
    <div className="flex flex-col items-start gap-3">
      <Switch defaultChecked>Log replies automatically</Switch>
      <Switch>Track opens</Switch>
      <Switch disabled>Two-step sign in (admin only)</Switch>
    </div>
  );
}
```

## Customising
- Colours: every part reads the foundation's roles (`--ns-canvas`, `--ns-ink`, `--ns-line`, `--ns-signal` …), which read your shadcn tokens (`--background`, `--foreground`, `--border`, `--destructive` …), plus the optional `--success` and `--warning`. Retheme on `:root` or any container; never add Tailwind colour classes inside the component.
- Dark mode follows the `.dark` class or `data-theme="dark"` on an ancestor (the shadcn and next-themes conventions).
- Update later: Commit or stash local changes first (or copy the files), so the update can be undone. Read https://notchset.dev/r/changelog.json for the new versions: a major version, an entry marked breaking or a merge says what to change. Then re-run the install with `--overwrite`, on a branch. It replaces the component's files, the shared helper files they import, and the item's CSS rules in the global stylesheet, so review the whole diff (components, shared files, CSS), re-apply your own edits, and run the app's typecheck, tests and build.

## Accessibility contract (preserve when editing)

## Install

```bash
npx shadcn@latest add https://notchset.dev/r/switch.json
```

Or add the `@notchset` registry to components.json and run `npx shadcn@latest add @notchset/switch`. Every components.json style gets the same files.

## Continue the workflow

- [Sign in and onboarding step](https://notchset.dev/blocks/sign-in)
- [Settings layout](https://notchset.dev/blocks/settings-layout)
- [API key list](https://notchset.dev/blocks/api-key-list)

## Source

### components/ui/notchset/switch.tsx

```tsx
// Notchset switch 2.0.0 · https://notchset.dev/changelog
"use client";
import * as React from "react";
import { Switch as Base } from "@base-ui/react/switch";
import { cn } from "@/lib/utils";

/*
 * Switch: a setting that takes effect the moment it flips (no Save). Off is a mid-grey track (--ns-ink-4, 3:1 or
 * better on every surface, so the control is seen before it's touched); on is ink. The
 * thumb slides on the system's ease. Children become its label. The target is 24px tall at least (a 1px clear band
 * above and below the track, outside its painted background); on touch screens the hit area grows to 40px.
 */
type SwitchProps = Omit<React.ComponentPropsWithoutRef<typeof Base.Root>, "className"> & {
  className?: string | undefined;
  children?: React.ReactNode;
};

function Switch({ className, children, ...props }: SwitchProps) {
  const track = (
    <Base.Root
      data-slot="switch"
      className={cn(
        "relative box-content inline-block h-[var(--ns-switch-h)] w-[var(--ns-switch-w)] shrink-0 bg-clip-content py-[max(0px,calc((24px-var(--ns-switch-h))/2))] cursor-pointer rounded-full bg-[var(--ns-ink-4)] outline-hidden [transition:background-color_160ms]",
        "data-checked:bg-[var(--ns-ink)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ns-signal)] data-disabled:cursor-default data-disabled:opacity-45",
        "pointer-coarse:after:absolute pointer-coarse:after:-inset-3 pointer-coarse:after:content-['']",
        className,
      )}
      {...props}
    >
      <Base.Thumb className="absolute top-[calc(3px+max(0px,calc((24px-var(--ns-switch-h))/2)))] left-[3px] block size-4 rounded-full bg-white shadow-[0_1px_2px_rgba(0,0,0,.3)] [transition:transform_200ms_var(--ns-ease),background-color_160ms] data-checked:translate-x-[calc(var(--ns-switch-w)-22px)] data-checked:bg-[var(--ns-panel)]" />
    </Base.Root>
  );
  if (!children) return track;
  return (
    <label data-slot="switch-label" className="inline-flex cursor-pointer items-center gap-2.5 text-[var(--ns-ink)] has-data-disabled:cursor-default">
      {track}
      <span className="min-w-0">{children}</span>
    </label>
  );
}

export { Switch, type SwitchProps };
```

The foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://notchset.dev/r/notchset-foundation.json.