import Vue from 'vue';
import Vuex from 'vuex';

import mutations from './mutations';
import * as actions from './actions';    // all actions are imported as separate vars

Vue.use(Vuex);

export default new Vuex.Store({
    state: {    },
    mutations,
    actions
});

import * as types from './mutation-types';

export const setFoo = ({ commit }, payload) => {
    commit(types.SET_FOO, payload);    // SET_FOO is defined in the mutation-types file
};

...
import actions from './actions';    // actions are imported as separate functions
...

import * as types from './mutation-types';

export default {
    [types.UPDATE_FOO] ({commit}, payload) {
        commit(types.UPDATE_FOO, payload);
    }
}

store.dispatch(types.UPDATE_FOO, 'some value');