Code Block

Preview

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.

npx shadcn@latest add https://ds.interlace.tools/r/code-block.json

npx shadcn@latest add @interlace/code-block

Import

2 named exports — pull the parts you need.

import { CodeBlock, MIN_VIEWPORT } from '@/components/ui/code-block';

Anatomy

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

CodeBlock                          (figure — data-min-viewport=320)
    ├─ figcaption                    (header bar; always rendered)
    │   ├─ {title}                   (left)
    │   ├─ {language tag}            (right)
    │   └─ <button> "Copy" / "Copied!" (right; client-only)
    └─ <pre>
        └─ <code class="language-{lang}">{children}</code>

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.

Skeleton

Pass loading and the component renders a shape-matched <Skeleton /> in its own place — same box, so nothing reflows when the data lands. Below is the same story with loading={true}.

<CodeBlock loading={isPending} />

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

Native element semantics — no interaction layer to get wrong.

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

• aria-label
• aria-live

Examples

4 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.

Dependencies

Base UI primitive

Native / no Base UI dependency

Lucide icons

• Check
• Copy

NPM dependencies

• lucide-react

Registry dependencies

• @interlace/theme
• @interlace/cn
• @interlace/skeleton

Source

The full implementation — components/ui/code-block.tsx once installed.

'use client';

import * as React from 'react';

// @interlace/code-block v1.3.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/code-block
// What changed since: https://ds.interlace.tools/c/code-block#history
// Generated banner — keep it, the upgrade diff reads this version.

/**
 * @interlace/ui — CodeBlock
 *
 * Fenced code block with a title bar (title left, language tag + copy button
 * right). The copy action shells out to `navigator.clipboard.writeText` and
 * flips an inline "Copied!" affordance for 1.5s — the only piece of state
 * this primitive owns. Everything else is structural: a `<figure>` wrapping
 * a `<pre><code class="language-{lang}">`, ready for any downstream syntax
 * highlighter (Shiki, Prism, hand-rolled — we don't care).
 *
 * The header ALWAYS renders — the copy button needs a home even when

…284 more lines…

Registry JSON

The raw registry record — what the shadcn CLI fetches.