Switch

Binary on/off control with immediate effect (no submit step) — the distinction from Checkbox, which collects a value for a form. Built on @base-ui/react/switch: Base UI owns `role="switch"`, `aria-checked`, Space/Enter activation and the…

form & inputclient320pxuiv1.1.0

Preview

Switch — live renderprimitives-switch--settings-rows

Rendered from the story the storybook (a11y) CI gate runs axe against — the preview can't show something that hasn't been verified.

Install

Two equivalent paths — the URL works in any shadcn-CLI setup; the alias works once you've registered @interlace in your components.json.

Via shadcn URL
npx shadcn@latest add https://ds.interlace.tools/r/switch.json
With the @interlace alias
npx shadcn@latest add @interlace/switch

Behavior

What this component does — the keyboard path, the measured colour, the text equivalent and the states it can be in. Every figure below is read out of the test or the source that enforces it by scripts/build-behavior-map.mjs, so nothing here can outlive the gate that keeps it true.

2 steps, 1 key press — replayed on every PR by the play function of KeyboardToggle. Axe cannot press a key, so this — not the a11y scan — is what proves the component is operable without a mouse.

  1. 1Toggle via mouse click
  2. 2Toggle back via keyboard SpaceSpace

Every semantic colour pair this component's own source uses, measured against the shipped hexes in all 4 theme × scheme combinations. The tightest is input on card at 3.11:1 (interlace · dark), against a floor of 3:1.

Measured WCAG contrast ratios per token pair and theme
PairinterlacelightinterlacedarkharborlightharbordarkFloor
input on cardcontrol border inside a card3.62:13.11:13.62:13.85:13.0:1SC 1.4.11
input on backgroundcontrol border (SC 1.4.11)3.62:13.35:13.43:14.25:13.0:1SC 1.4.11
ring on backgroundfocus ring (SC 2.4.13)8.80:111.79:18.39:110.03:13.0:1SC 1.4.11
primary on backgroundprimary tint on the page surface8.80:111.79:18.39:110.03:13.0:1SC 1.4.11
ring on cardfocus ring inside a card8.80:110.92:18.86:19.10:13.0:1SC 1.4.11
primary-foreground on primarycopy on a primary face8.80:111.79:18.86:110.03:14.5:1SC 1.4.3
primary on cardprimary tint inside a card8.80:110.92:18.86:19.10:13.0:1SC 1.4.11
foreground on backgroundbody copy19.65:116.97:117.74:116.19:14.5:1SC 1.4.3

Text pairs are held to 4.5:1 (WCAG 2.2 SC 1.4.3); borders, rings and chart axes to 3:1 (SC 1.4.11 non-text). Bold is the worst cell in the row — the one a brand fork has to keep an eye on.

Where it renders, how narrow it survives, and whether its lines are inside the coverage gate — three answers a consumer needs before the paste, not after the bug.

Render boundary
'use client'

Hydrates. It brings JavaScript to any route that imports it — put the boundary here, not at the page.

Minimum viewport
MIN_VIEWPORT = 320

Declared, not assumed. Below 320 CSS px the preflight contract draws a dev-mode outline — how to switch it on.

Coverage gate
not in the gate

The 100% gate currently covers src/charts/**/*.{ts,tsx} and src/lib/**/*.{ts,tsx} and src/primitives/{button-variants,data-state-model,meter-scale,skeleton-variants}.ts and src/primitives/{alert,aspect-ratio,avatar,badge,box,breadcrumb,button,callout,card,checkbox,code-editor,container,data-state,focus-ring,grade-badge,grid,input,label,meter,pagination,published-date,reading-time,section,section-boundary,separator,skip-link,stack,stat-strip,tag,textarea,typography,visually-hidden}.tsx and src/patterns/lint-playground.tsx. This file is outside it — the glob widens in phase 7.2.

History

This component is at v1.1.0, first shipped in @interlace/ui 1.0.0. The version is stamped as a banner into the file the install writes, so the copy in your tree says which one you have — compare it with the number above before deciding whether to re-run the install.

Import

2 named exports — pull the parts you need.

Public API
import { MIN_VIEWPORT, Switch } from '@/components/ui/switch';

Anatomy

Extracted from the primitive's JSDoc header. The source is the only documentation that can't drift.

Switch (Root)                 (button[role=switch] — data-min-viewport=320)
    └─ SwitchThumb              (the sliding knob)

API reference

Parsed from the type declarations in the source — the same file the install writes into your tree, so this table can't drift from the component you get.

Switch

Also accepts every prop of Base UI's <Switch.Root> — behaviour we compose rather than reimplement.

Accessibility

Every story for this component is rendered headlessly and checked with axe-core (wcag2aa, wcag22aa, best-practice, ACT) on every PR. That gate has no continue-on-error, so what ships has zero known violations.

What follows is what static analysis can see. Axe cannot press a key and never sees an overlay open, so the operable-without-a-mouse claim lives in Behavior instead, where the keyboard path is replayed step by step.

Focus + keyboard behaviour
Owned by @base-ui/react/switch — focus trapping, dismissal and typeahead come from the headless primitive, not from us.
Focus ring (WCAG 2.2 SC 2.4.13)
Inherited from the preflight focus contract shipped in @interlace/theme.
Reduced motion
No animation to gate.
ARIA in the source
  • role="switch"

Examples

6 more states from the same story file.

R-rule compliance

Every primitive in @interlace/ui models to the portable 26-rule floor enforced by the componentApi ESLint preset. The cells below pin exactly where each rule applies in this file.

RuleConceptWhere
R4Extends Base UI part props`React.ComponentProps<typeof BaseSwitch.Root>`
R6data-slot per part`switch` / `switch-thumb`
R7className merged + ...rest + ref`cn(BASE, className)` + `{...props}` + forwarded ref
R12Reuse over wrapBase UI owns state, keyboard and ARIA
R14Declares min viewport`data-min-viewport={String(MIN_VIEWPORT)}` + exported const
R18Tailwind onlyzero inline `style`
R19Tokens only`bg-input` / `bg-primary` / `ring-ring` (1 documented dev.)
R20AA contrasttable above — every composite measured
R25Client componentrequired — Base UI Switch ships client hooks
R26A11y from upstream`role="switch"` + `aria-checked` + Space/Enter

Minimum viewport

This primitive declares MIN_VIEWPORT = 320 CSS px (DESIGN_PRINCIPLES #14). When mounted in a container narrower than this, the preflight contract draws a dev-mode outline so the regression is visible during local development.

Opt-in to the dev-mode warning
<body data-interlace-dev>...</body>

Add the data-interlace-dev attribute to the body in development builds only — preflight then outlines any primitive whose container is below its declared data-min-viewport.

Dependencies

Base UI primitive
@base-ui/react/switch
Lucide icons
none
NPM dependencies
  • @base-ui/react
Registry dependencies

Source

The full implementation — components/ui/switch.tsx once installed.

104 lines · TypeScript
'use client';

import * as React from 'react';

// @interlace/switch v1.1.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/switch
// What changed since: https://ds.interlace.tools/c/switch#history
// Generated banner — keep it, the upgrade diff reads this version.

/**
 * @interlace/ui — Switch
 *
 * Binary on/off control with immediate effect (no submit step) — the
 * distinction from Checkbox, which collects a value for a form. Built on
 * @base-ui/react/switch: Base UI owns `role="switch"`, `aria-checked`,
 * Space/Enter activation and the controlled/uncontrolled pair
 * (`checked` + `onCheckedChange` / `defaultChecked`).
 * Mirrors: https://base-ui.com/react/components/switch
 *
 * ## Anatomy

…84 more lines…

Registry JSON

The raw registry record — what the shadcn CLI fetches.