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
712 B
712 B
category
| category |
|---|
| Utilities |
usePrevious
Holds the previous value of a ref.
Usage
import { usePrevious } from '@vueuse/core'
import { shallowRef } from 'vue'
const counter = shallowRef('Hello')
const previous = usePrevious(counter)
console.log(previous.value) // undefined
counter.value = 'World'
console.log(previous.value) // Hello
Type Declarations
/**
* Holds the previous value of a ref.
*
* @see {@link https://vueuse.org/usePrevious}
*/
export declare function usePrevious<T>(
value: MaybeRefOrGetter<T>,
): Readonly<ShallowRef<T | undefined>>
export declare function usePrevious<T>(
value: MaybeRefOrGetter<T>,
initialValue: T,
): Readonly<ShallowRef<T>>