hc-web-log-mon/packages/core/src/observer/watch.ts

基于 JS 跨平台插件，为前端项目提供【 行为、性能、异常、请求、资源、路由、曝光、录屏 】监控手段

import { Watcher } from './watcher'
import { isRef } from './ref'
import { ObserverValue, AnyFun, voidFun } from './types'

function watchInit(callback: AnyFun, getter: AnyFun) {
  new Watcher('', { watch: true, callback }, getter)
}

export function watch<T>(target: ObserverValue<T>, fun: voidFun<T>) {
  if (!isRef(target)) return
  watchInit(
    (newValue: T, oldValue: T) => {
      fun(newValue, oldValue)
    },
    function () {
      return target.value
    }
  )
}