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import Watcher from 'core/observer/watcher' import { noop } from 'shared/util' import { currentInstance } from '../currentInstance' // export type EffectScheduler = (...args: any[]) => any /** * @internal since we are not exposing this in Vue 2, it's used only for * internal testing. */ export function effect(fn: () => any, scheduler?: (cb: any) => void) { const watcher = new Watcher(currentInstance, fn, noop, { sync: true }) if (scheduler) { watcher.update = () => { scheduler(() => watcher.run()) } } }