Setting the file. One moment.
Subchapter 18.2
references/computedEager.mdMarkdown2 KBView on GitHub
Eager computed without lazy evaluation.
::: info This function will be removed in future version. :::
::: tip
Note💡: If you are using Vue 3.4+, you can use computed right away, you no longer need this function.
In Vue 3.4+, if the computed new value does not change, computed, effect, , , dependencies will not be triggered.
See:
:::
watchwatchEffectrendercomputed() when you have a complex calculation going on, which can actually profit from caching and lazy evaluation and should only be (re-)calculated if really necessary.computedEager() when you have a simple operation, with a rarely changing return value – often a boolean.import { computedEager } from '@vueuse/core'
const todos = ref([])
const hasOpenTodos = computedEager(() => !!todos.length)
console.log(hasOpenTodos.value) // false
toTodos.value.push({ title: 'Learn Vue' })
console.log(hasOpenTodos.value) // trueexport type ComputedEagerOptions = WatchOptionsBase
export type ComputedEagerReturn<T = any> = Readonly<ShallowRef<T>>
/**
*
* @deprecated This function will be removed in future version.
*
* Note: If you are using Vue 3.4+, you can straight use computed instead.
* Because in Vue 3.4+, if computed new value does not change,
* computed, effect, watch, watchEffect, render dependencies will not be triggered.
* refer: https://github.com/vuejs/core/pull/5912
*
* @param fn effect function
* @param options WatchOptionsBase
* @returns readonly shallowRef
*/
export declare function computedEager<T>(
fn: () => T,
options?: ComputedEagerOptions,
): ComputedEagerReturn<T>
/** @deprecated use `computedEager` instead */
export declare const eagerComputed: typeof computedEager