/* @flow */ import { inBrowser } from './dom' // use User Timing api (if present) for more accurate key precision const Time = inBrowser && window.performance && window.performance.now ? window.performance : Date export function genStateKey (): string { return Time.now().toFixed(3) } let _key: string = genStateKey() export function getStateKey () { return _key } export function setStateKey (key: string) { return (_key = key) }