web/src/store/index.js

import Vue from "vue";
import Vuex from "vuex";

import app from "./modules/app";
import user from "./modules/user";

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    //
  },
  mutations: {
    //
  },
  actions: {},
  modules: {
    app,
    user,
  },
});

export default store;