4a3ce4cc1d
Add comprehensive reference documentation for: - Vitest: environments, projects/workspaces, type testing, vi utilities - Pinia: HMR, Nuxt integration, SSR setup - Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives
47 lines
747 B
Markdown
47 lines
747 B
Markdown
---
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category: Elements
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---
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# useWindowFocus
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Reactively track window focus with `window.onfocus` and `window.onblur` events.
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## Usage
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```vue
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<script setup lang="ts">
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import { useWindowFocus } from '@vueuse/core'
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const focused = useWindowFocus()
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</script>
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<template>
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<div>{{ focused }}</div>
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</template>
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```
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## Component Usage
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```vue
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<template>
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<UseWindowFocus v-slot="{ focused }">
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Document Focus: {{ focused }}
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</UseWindowFocus>
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</template>
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```
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## Type Declarations
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```ts
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/**
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* Reactively track window focus with `window.onfocus` and `window.onblur`.
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*
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* @see https://vueuse.org/useWindowFocus
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*
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* @__NO_SIDE_EFFECTS__
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*/
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export declare function useWindowFocus(
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options?: ConfigurableWindow,
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): ShallowRef<boolean>
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```
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