text: import { action, observable } from 'mobx'
  
  let store = null
  
  export class Store {
    @observable lastUpdate = Date.now()
    @observable light = false
  
    constructor (isServer, lastUpdate) {
      this.lastUpdate = lastUpdate
    }
  
    @action start = () => {
      this.timer = setInterval(() => {
        this.lastUpdate = Date.now()
        this.light = true
      }, 1000)
    }
  
    stop = () => clearInterval(this.timer)
  }
  
  export function initializeStore (isServer, lastUpdate = Date.now()) {
    if (isServer) {
      return new Store(isServer, lastUpdate)
    } else {
      if (store === null) {
        store = new Store(isServer, lastUpdate)
      }
      return store
    }
  }
  