Use when working with VueUse composables - track mouse position with useMouse, manage localStorage with useStorage, detect network status with useNetwork, debounce values with refDebounced, and access browser APIs reactively. Check VueUse before writing custom composables - most patterns already implemented.
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Collection of essential Vue Composition utilities. Check VueUse before writing custom composables - most patterns already implemented.
Current stable: VueUse 14.x for Vue 3.5+
Vue 3:
pnpm add @vueuse/core
Nuxt:
pnpm add @vueuse/nuxt @vueuse/core
// nuxt.config.ts
export default defineNuxtConfig({
modules: ['@vueuse/nuxt'],
})
Nuxt module auto-imports composables - no import needed.
| Category | Examples |
|---|---|
| State | useLocalStorage, useSessionStorage, useRefHistory |
| Elements | useElementSize, useIntersectionObserver, useResizeObserver |
| Browser | useClipboard, useFullscreen, useMediaQuery |
| Sensors | useMouse, useKeyboard, useDeviceOrientation |
| Network | useFetch, useWebSocket, useEventSource |
| Animation | useTransition, useInterval, useTimeout |
| Component | useVModel, useVirtualList, useTemplateRefsList |
| Watch | watchDebounced, watchThrottled, watchOnce |
| Reactivity | createSharedComposable, toRef, toReactive |
| Array | useArrayFilter, useArrayMap, useSorted |
| Time | useDateFormat, useNow, useTimeAgo |
| Utilities | useDebounce, useThrottle, useMemoize |
Load composable files based on what you need:
| Working on... | Load file |
|---|---|
| Finding a composable | references/composables.md |
| Specific composable | composables/<name>.md |
Consider loading these reference files based on your task:
DO NOT load all files at once. Load only what's relevant to your current task.
State persistence:
const state = useLocalStorage('my-key', { count: 0 })
Mouse tracking:
const { x, y } = useMouse()
Debounced ref:
const search = ref('')
const debouncedSearch = refDebounced(search, 300)
Shared composable (singleton):
const useSharedMouse = createSharedComposable(useMouse)
Many VueUse composables use browser APIs unavailable during SSR.
Check with isClient:
import { isClient } from '@vueuse/core'
if (isClient) {
// Browser-only code
const { width } = useWindowSize()
}
Wrap in onMounted:
const width = ref(0)
onMounted(() => {
// Only runs in browser
const { width: w } = useWindowSize()
width.value = w.value
})
Use SSR-safe composables:
// These check isClient internally
const mouse = useMouse() // Returns {x: 0, y: 0} on server
const storage = useLocalStorage('key', 'default') // Uses default on server
@vueuse/nuxt auto-handles SSR - composables return safe defaults on server.
When targeting component refs instead of DOM elements:
import type { MaybeElementRef } from '@vueuse/core'
// Component ref needs .$el to get DOM element
const compRef = ref<ComponentInstance>()
const { width } = useElementSize(compRef) // ❌ Won't work
// Use MaybeElementRef pattern
import { unrefElement } from '@vueuse/core'
const el = computed(() => unrefElement(compRef)) // Gets .$el
const { width } = useElementSize(el) // ✅ Works
Or access $el directly:
const compRef = ref<ComponentInstance>()
onMounted(() => {
const el = compRef.value?.$el as HTMLElement
const { width } = useElementSize(el)
})
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Use when working on Nuxt 4+ projects - provides server routes, file-based routing, middleware patterns, Nuxt-specific composables, and configuration with latest docs. Covers h3 v1 helpers (validation, WebSocket, SSE) and nitropack v2 patterns. Updated for Nuxt 4.3+.
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Use when creating Nuxt modules: (1) Published npm modules (@nuxtjs/, nuxt-), (2) Local project modules (modules/ directory), (3) Runtime extensions (components, composables, plugins), (4) Server extensions (API routes, middleware), (5) Releasing/publishing modules to npm, (6) Setting up CI/CD workflows for modules. Provides defineNuxtModule patterns, Kit utilities, hooks, E2E testing, and release automation.
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Use when building styled UI with @nuxt/ui v4 components - create forms with validation, implement data tables with sorting, build modal dialogs and overlays, configure Tailwind Variants theming. Use vue skill for raw component patterns, reka-ui for headless primitives.
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Use when building with Reka UI (headless Vue components) - provides component API, accessibility patterns, composition (asChild), controlled/uncontrolled state, virtualization, and styling integration. Formerly Radix Vue.
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Vite build tool configuration, plugin API, SSR, and Vite 8 Rolldown migration. Use when working with Vite projects, vite.config.ts, Vite plugins, or building libraries/SSR apps with Vite.
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Use when writing unit/integration tests for Vite projects - configure vitest.config.ts, write test suites with describe/it, create mock implementations with vi.fn and vi.mock, set up code coverage thresholds, and run tests in parallel
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