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primer-react

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آخر تحديث١٧ يونيو ٢٠٢٦ في ٠٩:٠٤

Build accessible UI with Primer React, GitHub's design system (Button, IconButton, TextInput, Textarea, Select, Checkbox, FormControl, Heading, Text, Stack, Label, CounterLabel, Flash, StateLabel, BranchName, ProgressBar, Spinner, Timeline, RelativeTime). Use when the user asks for a Primer-styled page, a GitHub-style screen, or wires Primer tokens through @primer/primitives. Triggers: 'primer', 'primer react', '@primer/react', 'github ui', 'octicons'. Scope: components, tokens, assets. Out of scope: tone of voice and marketing copy — route copy rules to a sibling skill. IMPORTANT: this file is an orchestrator. Load the references/ files named in the routing table; SKILL.md alone is insufficient.

التثبيت

التثبيت باستخدام Codex أو Claude انسخ هذا Prompt والصقه في Codex أو Claude أو مساعد آخر ليراجع صفحة Skill ويثبّتها لك.

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SKILL.md

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name

primer-react

description

Build accessible UI with Primer React, GitHub's design system (Button, IconButton, TextInput, Textarea, Select, Checkbox, FormControl, Heading, Text, Stack, Label, CounterLabel, Flash, StateLabel, BranchName, ProgressBar, Spinner, Timeline, RelativeTime). Use when the user asks for a Primer-styled page, a GitHub-style screen, or wires Primer tokens through @primer/primitives. Triggers: 'primer', 'primer react', '@primer/react', 'github ui', 'octicons'. Scope: components, tokens, assets. Out of scope: tone of voice and marketing copy — route copy rules to a sibling skill. IMPORTANT: this file is an orchestrator. Load the references/ files named in the routing table; SKILL.md alone is insufficient.

Mission

A primer-react skill is an adapter that teaches an agent how to build high-fidelity apps with Primer React. It is not a copy of the documentation. It tells the agent what to read, what APIs are public, what sources are authoritative, and how to verify that generated UI uses the system correctly.

In scope: tokens, assets, component descriptions, component APIs. Out of scope: tone of voice, marketing copy, product copywriting. When you encounter a copy/naming/casing rule during generation (e.g. "Title Case the label", "placeholder is action-oriented"), recognize it, route it — mention it as a candidate for a sibling copy skill — but do NOT extract it into this DS skill.

Setup

Install:

npm install @primer/react @primer/primitives @primer/octicons-react

Wire the provider in app/layout.tsx (verbatim from vercel-labs/primer-nextjs-template@app/layout.tsx):

"use client";

import "./globals.css";

import { BaseStyles, ThemeProvider } from "@primer/react";
import type { ReactNode } from "react";

export default function RootLayout({ children }: { children: ReactNode }) {
  return (
    <html
      lang="en"
      data-color-mode="auto"
      data-light-theme="light"
      data-dark-theme="dark"
      suppressHydrationWarning
    >
      <body>
        <ThemeProvider colorMode="auto">
          <BaseStyles
            style={{
              backgroundColor: "var(--bgColor-default)",
              height: "100vh",
            }}
          >
            {children}
          </BaseStyles>
        </ThemeProvider>
      </body>
    </html>
  );
}

Source: vercel-labs/primer-nextjs-template@app/layout.tsx.

"use client" is required because ThemeProvider colorMode="auto" reads the browser preference at runtime. suppressHydrationWarning on <html> is required because the provider writes the resolved mode attribute during hydration.

NOTE — the height: "100vh" on <BaseStyles style> above is verbatim from the reference project (a single-screen showcase). In YOUR app use minHeight instead; see the fixed-viewport-height Hard Rule below.

Companion CSS — app/globals.css

/* Primer Primitives — design tokens (CSS custom properties).
   Base + functional primitives establish the token baseline that the
   composition exemplars read (size, border, shadow, typography). Themes
   live in this file too so all primitives CSS lives in one place. */
@import "@primer/primitives/dist/css/base/size/size.css";
@import "@primer/primitives/dist/css/base/typography/typography.css";
@import "@primer/primitives/dist/css/base/motion/motion.css";
@import "@primer/primitives/dist/css/functional/motion/motion.css";
@import "@primer/primitives/dist/css/functional/size/border.css";
@import "@primer/primitives/dist/css/functional/size/breakpoints.css";
@import "@primer/primitives/dist/css/functional/size/radius.css";
@import "@primer/primitives/dist/css/functional/size/size-coarse.css";
@import "@primer/primitives/dist/css/functional/size/size-fine.css";
@import "@primer/primitives/dist/css/functional/size/size.css";
@import "@primer/primitives/dist/css/functional/size/viewport.css";
@import "@primer/primitives/dist/css/functional/spacing/space.css";
@import "@primer/primitives/dist/css/functional/typography/typography.css";

@import "@primer/primitives/dist/css/functional/themes/light.css";
@import "@primer/primitives/dist/css/functional/themes/dark.css";

html,
body {
  min-height: 100%;
}

body {
  background-color: var(--bgColor-default);
  color: var(--fgColor-default);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

Source: vercel-labs/primer-nextjs-template@app/globals.css.

Both light.css AND dark.css MUST be imported when data-color-mode="auto" is set. Importing only one branch leaves the other unpainted — the canonical mode-mismatch bug. Note that this globals.css already uses the safe min-height: 100% form on html, body; the fixed height: "100vh" lives only on the <BaseStyles> element in layout.tsx.

Import rules

Canonical import path is @primer/react. Do NOT reach for @primer/react/lib-esm/<Component>, @primer/react/dist/<Component>, or any other internal subpath — those are not public. Source: node_modules/@primer/react/package.json (exports field; root export is the only public surface).
Icons import from @primer/octicons-react: import { AlertIcon } from '@primer/octicons-react'. Source: node_modules/@primer/octicons-react/dist/icons.d.ts.
Tokens are consumed as CSS variables (var(--bgColor-default)), not via the legacy theme JS object. Source: https://primer.style/product/primitives/#css-variables.

Source-of-truth rules

Canonical source (code, wins on conflict): node_modules/@primer/react/dist/**/*.d.ts — prop signatures, variant unions, native-attribute passthroughs. Every positive prop claim in references/components/*.md is cited to a dist/**/*.d.ts:line (or a dist/**/*.js:line for implementation-level behavior the d.ts cannot express, e.g. Select's defaultValue ?? placeholder forwarding).
Tokens (code): node_modules/@primer/primitives/dist/css/functional/themes/{light,dark}.css — the per-mode functional token definitions.
Assets (code): node_modules/@primer/octicons-react/dist/icons.d.ts — the exhaustive export inventory AND the closed IconProps surface; never invent a *Icon name, never pass style to an octicon.
Docs (prose, cited not extracted for prop claims): https://primer.style/product/, https://primer.style/product/primitives/, https://primer.style/octicons/, https://primer.style/accessibility/ — extracted prose rules (tokens, octicons) live in references/foundations/*.md with per-URL citations.
Storybook: the Primer Storybook is JS-rendered; do not fetch it for prop claims. Story sources live alongside the component code at packages/react/src/<Component>/<Component>.stories.tsx in the primer/react repo.
Reference project: vercel-labs/primer-nextjs-template@main — the verbatim wiring source for Setup above and for the 6 composition exemplars under references/examples/.

When to Load References

Trigger	Files to load	Notes
user asks for a button (filled/danger/loading)	references/components/button.md	per-component file
user asks for an icon-only button	references/components/icon-button.md	aria-label is the accessible name + tooltip text
user asks for a single-line input	references/components/text-input.md	leading/trailing visuals, loading, validationStatus
user asks for a multi-line input	references/components/textarea.md	resize, characterLimit, validationStatus
user asks for a select	references/components/select.md	styled native `<select>`; placeholder doubles as the implicit default; `multiple` is omitted
user asks for a checkbox	references/components/checkbox.md	indeterminate, required, ARIA-only validationStatus; control-first children order
user wires a form (label + caption + validation)	references/components/form-control.md	a11y composition rules (Label/Caption/Validation/LeadingVisual subcomponents)
user asks for a heading	references/components/heading.md	semantic `as` + visual `variant`
user asks for inline text	references/components/text.md	size/weight; no semantic foreground variant
user asks for a layout container	references/components/stack.md	gap/direction/align/justify/wrap/padding scales, Stack.Item; box-not-baseline alignment trap
user asks for a metadata badge	references/components/label.md	metadata only — never a lifecycle capsule
user asks for a numeric count badge	references/components/counter-label.md	numeric count next to a label
user asks for an inline banner / alert	references/components/flash.md	variant: default/warning/success/danger; `full` for edge-to-edge
user asks for a PR/issue lifecycle pill	references/components/state-label.md	required `status` keyed to the lifecycle octicon map
user asks for a branch chip / branch name	references/components/branch-name.md	renders `<a>` by default; `as="span"` for non-link chips
user asks for a progress meter / determinate bar	references/components/progress-bar.md	determinate progress track; `ProgressBar.Item` for multi-segment; semantic-token fill
user asks for a loading / busy indicator	references/components/spinner.md	standalone animated loader; `srText` (string\|null); reduced-motion gated
user asks for an event / activity feed (CI checks, history)	references/components/timeline.md	compound `Timeline.Item/Badge/Body/Break`; `Badge` variant carries lifecycle color
user asks for a relative timestamp ("N hours ago")	references/components/relative-time.md	wraps `<relative-time>`; `date` prop; formats on the client (hydration)
user composes a screen, page, or section layout	references/design-craft.md	DS-agnostic design-craft defaults, shipped verbatim by the meta-skill — the DS wins on conflict
user picks tokens for color, spacing, radius, shadow	references/tokens.md	consumed-token ledger (12 tokens) + foundation rule subsections
user reads token and theme foundation prose	references/foundations/index.md	per-URL extracted foundation rules
user colors or sizes an octicon	references/foundations/octicons.md	size buckets, name-size naming, closed prop surface (`currentColor` recipe)
user reviews available composition exemplars	references/examples/index.md	one entry per composition exemplar lifted from `vercel-labs/primer-nextjs-template`
home: route-index with token-painted link cards	references/examples/home.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/page.tsx
repos: list page with PageHeader + table + filter	references/examples/repos.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/repos/page.tsx
new: form page with token-painted card + action footer	references/examples/new.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/new/page.tsx
settings: sidebar-nav page	references/examples/settings.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/settings/page.tsx
empty: blankslate visual + heading + action	references/examples/empty.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/empty/page.tsx
dashboard: multi-section stat cards + timeline	references/examples/dashboard.md	composition exemplar lifted from vercel-labs/primer-nextjs-template/app/dashboard/page.tsx
(maintenance) slug registry / audit	references/anti-patterns.md	shell + asset slug resolution; rules mirrored into `## Hard rules` + per-component files; not required during generation

Component slate

Button — action trigger; variant/size/loading/inactive, leadingVisual/trailingVisual slots, count
IconButton — icon-only button; aria-label required, doubles as tooltip unless unsafeDisableTooltip
TextInput — single-line input; leading/trailingVisual, loading, validationStatus, monospace
Textarea — multi-line input; resize, characterLimit, validationStatus
Select — styled native select; block/placeholder/validationStatus; placeholder doubles as implicit default
Checkbox — controlled boolean input; indeterminate, validationStatus
FormControl — input wrapper; Label/Caption/Validation/LeadingVisual subcomponents for label association
Heading — semantic heading; as="h2" default, variant scale
Text — inline text primitive; size/weight/whiteSpace
Stack — flex layout primitive; gap/direction/align/justify, Stack.Item
Label — small metadata badge; variant/size
CounterLabel — numeric count badge; scheme/variant
Flash — inline banner; variant default/success/warning/danger, full-width option
StateLabel — lifecycle state capsule; required status keyed to the lifecycle octicon map (open/merged/closed)
BranchName — branch chip; renders <a> by default (as defaults to 'a')
ProgressBar — determinate progress meter; progress value, ProgressBar.Item for multi-segment, semantic-token fill
Spinner — standalone busy indicator; size, srText (string | null), reduced-motion gated
Timeline — event/activity feed; compound Timeline.Item/Badge/Body/Break, Badge variant carries lifecycle color
RelativeTime — live relative timestamp; date, with tense/format/precision forwarded to <relative-time>

Hard rules

The body/root MUST paint with var(--bgColor-default) via either the <BaseStyles style={{ backgroundColor: "var(--bgColor-default)" }}> style prop OR body { background-color: var(--bgColor-default); color: var(--fgColor-default); } in globals.css — both belt-and-braces is the wiring lifted from the reference project. A token-painted component on an unpainted shell is the canonical mode-mismatch bug — see references/anti-patterns.md shell/unpainted-body.
The <ThemeProvider> MUST wrap children, not render as a sibling: <ThemeProvider><BaseStyles>{children}</BaseStyles></ThemeProvider>. Provider context only reaches descendants — see shell/provider-not-sibling.
<BaseStyles> MUST receive {children} (not siblings) — descendants inherit Primer's reset (line-height, font, link color) only through the wrap — see shell/content-wrap-base-styles.
<html data-color-mode="auto" data-light-theme="light" data-dark-theme="dark"> MUST be paired with BOTH @import "@primer/primitives/dist/css/functional/themes/light.css" AND @import ".../dark.css" in globals.css. The attribute sets the resolution context; the imports provide the values — see shell/mode-attribute-without-theme-import.
suppressHydrationWarning MUST be set on <html> when ThemeProvider is mounted. The provider writes the resolved color-mode attribute during hydration and React would otherwise warn — see shell/suppress-hydration-warning.
The shell wrapper in Setup uses height: "100vh" verbatim from the reference project (a single-screen showcase); in YOUR app use minHeight on the <BaseStyles style={{ backgroundColor: "var(--bgColor-default)", minHeight: "100vh" }}> surface — a fixed height clips content taller than the viewport and breaks page scrolling — see shell/fixed-viewport-height. (The companion globals.css already uses the safe min-height: 100% form.)
Any prop, variant, token, or asset the agent cannot ground in source gets a literal [ VERIFY ] (no spaces in actual use) marker inline — see the skill's open VERIFY tally in references/foundations/octicons.md:25.
Report blockers instead of guessing.

Final checks

After generating UI: cite each component used to its source file (node_modules/@primer/react/dist/<Component>/<Component>.d.ts:<line> for prop claims, vercel-labs/primer-nextjs-template@<path> for composition lifts); list any unverified facts ([ VERIFY ] markers, written without internal spaces) that had to remain; name the screen-level prompt that was built; and confirm shell parity: the page/root surface paints with var(--bgColor-default), the mode-attribute trio on <html> matches the imported theme CSS files (light.css + dark.css), <ThemeProvider> wraps <BaseStyles>{children}</BaseStyles> rather than rendering as a sibling, and the shell wrapper fills the viewport with minHeight (never a fixed height — shell/fixed-viewport-height). Shell parity is re-checked after ANY edit to the consumer app's layout.tsx / providers / globals.css, not only on greenfield creation.