123456789101112131415161718192021222324252627282930
import { subscribe } from '../vanilla'
/** * 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. * * @example * import { subscribeKey } from 'valtio/utils' * subscribeKey(state, 'count', (v) => console.log('state.count has changed to', v)) */export function subscribeKey<T extends object, K extends keyof T>(  proxyObject: T,  key: K,  callback: (value: T[K]) => void,  notifyInSync?: boolean) {  return subscribe(    proxyObject,    (ops) => {      if (ops.some((op) => op[1][0] === key)) {        callback(proxyObject[key])      }    },    notifyInSync  )}