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
}
})
})
}