Frontend

App Template Frontend Development

This skill covers building and modifying the App Template frontend — a Nuxt 4 SSR app at frontend/.

Tech Stack

• Nuxt ^4.0.0 — SSR enabled
• Vue ^3.5.0 — Composition API (<script setup>)
• PrimeVue ^4.0.0 — UI components (explicit imports, no Nuxt module)
• Tailwind CSS 3 — utility classes via PostCSS (no @nuxtjs/tailwindcss)
• Pinia — state management (@pinia/nuxt module)

Critical Rules

1. PrimeVue: Always Import Explicitly

There is NO @primevue/nuxt-module. Components must be imported per-file:

<script setup>
  import DataTable from 'primevue/datatable'
  import Column from 'primevue/column'
  import Button from 'primevue/button'
  import Tag from 'primevue/tag'
</script>

Plugin setup is in app/plugins/primevue.ts (Aura theme, dark mode, ToastService).

2. Nuxt 4 Routing: No file + directory with same name

In Nuxt 4, having both pages/foo.vue and pages/foo/ directory makes foo.vue a nested layout wrapper. This breaks direct navigation to /foo.

# WRONG: foo.vue becomes a layout wrapper, /foo may not render
pages/foo.vue
pages/foo/bar.vue

# CORRECT: use index.vue inside the directory
pages/foo/index.vue    → /foo
pages/foo/bar.vue      → /foo/bar

3. SSR Hydration: Use <ClientOnly> for dynamic UI

Wrap dynamic content in <ClientOnly> to avoid hydration mismatches:

<ClientOnly>
  <DynamicComponent />
  <template #fallback>
    <div class="h-40 bg-surface-800 animate-pulse rounded-xl" />
  </template>
</ClientOnly>

4. API Calls: Use native fetch() in stores

// In Pinia stores and composables — use native fetch()
const res = await fetch('/api/v1/app/some-endpoint')
const data = await res.json()

5. Tailwind: PostCSS Config Only

Tailwind is configured via PostCSS in nuxt.config.ts:

postcss: {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
}

Project Layout

frontend/app/
├── pages/              # Routes (dashboard, etc.)
├── components/         # Vue components organized by domain
├── stores/             # Pinia stores
│   └── appConfig.ts   # App name and config
├── composables/        # Hooks
│   ├── useApi.ts      # HTTP client (fetch wrapper)
│   ├── useAppConfig.ts  # App name and config
│   └── useRealtimeUpdates.ts # WebSocket composable
├── plugins/            # primevue.ts, appConfig.ts
├── layouts/            # default.vue (header + nav), public.vue
├── types/              # api.ts (TypeScript interfaces)
└── assets/css/         # styles.css (Tailwind layers + custom classes)

Frontend Proxy

The Nuxt server proxy (frontend/server/middleware/proxy.ts) forwards API requests to the backend. When adding a new backend router, add its prefix to PROXY_PATHS:

const PROXY_PATHS = ['/api/', '/mcp/']

Creating New Pages

1. Add frontend/app/pages/my-page.vue
2. Route is auto-registered as /my-page
3. Create store in stores/ if page needs state
4. Import PrimeVue components explicitly

Creating New Components

Components in frontend/app/components/ auto-import by directory/filename:

• PageHeader.vue → <PageHeader>
• example/ExampleCard.vue → <ExampleCard>

Organize by domain subdirectory.

Dev Server

make up         # Start dev stack with hot reload (via Docker + Traefik)
make fe-logs    # Tail frontend logs
make fe-run     # Run frontend locally (outside Docker)

Dev URL: http://app.localhost (via Traefik proxy)