text: import { observable, action } from 'mobx'
  
  export default class CounterStore {
    @observable value = 0
  
    @action resetCounter = () => {
      this.value = 0
    }
  
    @action addOne = () => {
      this.value ++
    }
  
    @action removeOne = () => {
      this.value --
    }
  }
  