What is the purpose of hotUpdate API of vuex store?

The store.hotUpdate() API method is used for mutations and modules.

For example, you need to configure vuex store as below,

// store.js
import Vue from 'vue'
import Vuex from 'vuex'
import mutations from './mutations'
import myModule from './modules/myModule'

Vue.use(Vuex)

const state = { message: "Welcome to hot reloading" }

const store = new Vuex.Store({
  state,
  mutations,
  modules: {
    moduleA: myModule
  }
})

if (module.hot) {
  // accept actions and mutations as hot modules
  module.hot.accept(['./mutations', './modules/newMyModule'], () => {
    // Get the updated modules
    const newMutations = require('./mutations').default
    const newMyModule = require('./modules/myModule').default
    //swap in the new modules and mutations
    store.hotUpdate({
      mutations: newMutations,
      modules: {
        moduleA: newMyModule
      }
    })
  })
}

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