Frontend Vue3

Frontend - Vue 3

When to use this skill

• Feature work or fixes in Vue 3 projects scaffolded with Vite.
• Creating pages/components, routing, forms, state (Pinia), or API integration.
• Testing, linting, performance, or accessibility improvements in the Vue app.

Quick start

1. Install: npm ci (or pnpm i, yarn as project standard).
2. Env: copy .env.example -> .env; set VITE_API_URL and other VITE_ vars.
3. Dev server: npm run dev; build: npm run build; preview: npm run preview.
4. Quality: npm run lint for ESLint; npm run test (Vitest) if present.

Project structure basics

• src/main.ts: app bootstrap; registers router, Pinia, global styles.
• src/router/*: route definitions; lazy-load views to shrink bundles.
• src/stores/*: Pinia stores for shared state.
• src/components/*: reusable UI; keep props typed and emit events explicitly.
• src/composables/*: extract logic into composables for reuse/testability.

Coding principles

• Keep components small; move logic to composables; keep stores focused and typed.
• Validate inputs, handle loading/error states explicitly, and surface user-friendly messages.
• Accessibility first: semantic elements, focus management, keyboard support.
• Enforce lint/type/test/build before merge (see scripts/dev-check.sh).

Patterns and snippets

• Composition, router, Pinia, form, and HTTP client templates live in references/snippets.md.
• Prefer route-level code splitting; centralize HTTP client (base URL, auth, error normalization).
• Use v-model + client-side validation; show per-field API errors.

Testing

• Component tests with Vitest + Vue Test Utils; mock stores and router as needed.
• Prefer testing behavior (rendered text, emitted events) over implementation details.

Performance and DX

• Use <script setup> and <Suspense> for async components when helpful.
• Split vendor chunks via Vite config if bundles grow large.
• Keep components small; extract logic to composables; avoid unnecessary reactive nesting.

Accessibility and UI

• Use semantic elements first; bind aria-* labels for interactive controls.
• Manage focus on navigation or modal open/close; ensure keyboard access.

Bundled resources

• scripts/dev-check.sh: run before committing/raising a PR to ensure lint, type-check, tests, and build all pass with the detected package manager.
• references/coding-standards.md: quick guardrails on component sizing, typing, accessibility, and pre-merge checks.
• references/best-practices.md: deeper guidance for routing, state, styling, API, testing, performance, and a11y decisions.
• references/snippets.md: ready-to-use templates for composition API, routing, Pinia, forms, and HTTP client setup.
• assets/pr-template.md: use when opening PRs so reviewers see scope, testing proof, and UI evidence (desktop/mobile, a11y/perf notes).

Delivery checklist

• Lint and tests clean; types pass.
• No console logs left; env vars documented; API errors surfaced to users.
• Routes lazy-loaded; bundle size reasonable; loading states present for async flows.

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