subscribeKey | /src/vanilla/utils.ts | valtio@v2.1.1

function subscribeKey

import { subscribeKey } from "https://deno.land/x/valtio@v2.1.1/src/vanilla/utils.ts";

subscribeKey<T extends object, K extends keyof T>(

proxyObject: T,

key: K,

callback: (value: T[K]) => void,

notifyInSync?: boolean,

): () => void

subscribeKey

The subscribeKey utility enables subscription to a primitive subproperty of a given state proxy. Subscriptions created with subscribeKey will only fire when the specified property changes. notifyInSync: same as the parameter to subscribe(); true disables batching of subscriptions.

Examples

import { subscribeKey } from 'valtio/utils' subscribeKey(state, 'count', (v) => console.log('state.count has changed to', v))

Type Parameters

T extends object

K extends keyof T

Parameters

proxyObject: T

key: K

callback: (value: T[K]) => void

optional

notifyInSync: boolean

Returns

() => void