useCloned

Demo

Usage

import { useCloned } from '@vueuse/core'

const original = ref({ key: 'value' })

const { cloned } = useCloned(original)

original.value.key = 'some new value'

console.log(cloned.value.key) // 'value'

Changes to the source are not reflected in the cloned ref immediately. Use { flush: 'sync' } to obtain the updated value without delay.

TypeScript

const { cloned } = useCloned(original, { flush: 'sync' })

original.value.key = 'some new value'

console.log(cloned.value.key) // 'some new value'

'use strict'
const { cloned } = useCloned(original, { flush: 'sync' })
original.value.key = 'some new value'
console.log(cloned.value.key) // 'some new value'

Manual cloning

import { useCloned } from '@vueuse/core'

const original = ref({ key: 'value' })

const { cloned, sync } = useCloned(original, { manual: true })

original.value.key = 'manual'

console.log(cloned.value.key) // 'value'

sync()

console.log(cloned.value.key)// 'manual'

Custom Clone Function

Using klona for example:

import { useCloned } from '@vueuse/core'
import { klona } from 'klona'

const original = ref({ key: 'value' })

const { cloned, isModified, sync } = useCloned(original, { clone: klona })

Type Declarations

export interface UseClonedOptions<T = any> extends WatchOptions {
  /**
   * Custom clone function.
   *
   * By default, it use `JSON.parse(JSON.stringify(value))` to clone.
   */
  clone?: (source: T) => T
  /**
   * Manually sync the ref
   *
   * @default false
   */
  manual?: boolean
}
export interface UseClonedReturn<T> {
  /**
   * Cloned ref
   */
  cloned: Ref<T>
  /**
   * Ref indicates whether the cloned data is modified
   */
  isModified: Ref<boolean>
  /**
   * Sync cloned data with source manually
   */
  sync: () => void
}
export type CloneFn<F, T = F> = (x: F) => T
export declare function cloneFnJSON<T>(source: T): T
export declare function useCloned<T>(
  source: MaybeRefOrGetter<T>,
  options?: UseClonedOptions,
): UseClonedReturn<T>