49 lines
865 B
Markdown
49 lines
865 B
Markdown
---
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category: Browser
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---
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# usePerformanceObserver
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Observe performance metrics.
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## Usage
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```ts
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import { usePerformanceObserver } from '@vueuse/core'
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const entrys = ref<PerformanceEntry[]>([])
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usePerformanceObserver({
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entryTypes: ['paint'],
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}, (list) => {
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entrys.value = list.getEntries()
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})
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```
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## Type Declarations
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```ts
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export type UsePerformanceObserverOptions = PerformanceObserverInit &
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ConfigurableWindow & {
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/**
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* Start the observer immediate.
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*
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* @default true
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*/
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immediate?: boolean
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}
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/**
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* Observe performance metrics.
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*
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* @see https://vueuse.org/usePerformanceObserver
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* @param options
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*/
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export declare function usePerformanceObserver(
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options: UsePerformanceObserverOptions,
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callback: PerformanceObserverCallback,
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): {
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isSupported: ComputedRef<boolean>
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start: () => void
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stop: () => void
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}
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```
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