ruby-on-rails – 无法在Webpacker中的vuex突变测试中导入vue.es

我正在使用带有 this approach的Webpacker(要求我导入vue.esm.js).我想测试我在 testing vuex docs中描述的vuex突变.当我从’vue’使用import Vue时它可以工作,但是当我从’vue / dist / vue.esm’使用import Vue时不行.但是,如果我在商店中不使用vue.esm,我的Webpacker Vue应用程序会中断.

这是我的商店：

// store.js
import Vue from 'vue/dist/vue.esm' // changing this to import from 'vue' works
import Vuex from 'vuex'
Vue.use(Vuex)

const state = {
  count: 0
}

// export `mutations` as a named export
export const mutations = {
  increment: state => state.count++
}

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

这是我的测试：

import { mutations } from './store'

// destructure assign `mutations`
const { increment } = mutations

describe('mutations',() => {
  it('INCREMENT',() => {
    // mock state
    const state = { count: 0 }
    // apply mutation
    increment(state)
    // assert result
    expect(state.count).toBe(1)
  })
})

以上测试结果如下：

FAIL  app/javascript/test/unit/specs/mutations.spec.js
  ● Test suite failed to run

    myproject/node_modules/vue/dist/vue.esm.js:10671
    export default Vue$3;
    ^^^^^^

    SyntaxError: Unexpected token export

我究竟做错了什么？

// custom.js
const vueFile = process.env.NODE_ENV === 'production' ? 'vue/dist/vue.min.js' : 'vue/dist/vue.js';
module.exports = {
  resolve: {
    alias: {
      vue: vueFile,vue_resource: 'vue-resource/dist/vue-resource',},};

// environment.js
const { environment } = require('@rails/webpacker');
const customConfig = require('./custom');
const vue = require('./loaders/vue');

environment.config.merge(customConfig);
environment.loaders.append('vue',vue);

module.exports = environment;