webpack4动态import无法拿到chunkname

Question

webpack.base.config.js:

    entry: {
        app: './src/index.js'
    },
    output: {
        path: config.build.assetsRoot,  // '/'
        publicPath: config.dev.assetsPublicPath,    // 'static'
        filename: '[name].bundle.js',
        chunkFilename: '[name].chunk.js'
    },

router(使用require.ensure能正确拿到name):

const routes = [
  {
    path: '/',
    component: r => {
      require.ensure([], () => r(require('./view/index/index.vue')), 'index')
    }
  },
  {
    path: '/errorPage',
    component: r => {
      require.ensure([], () => r(require('./view/errorPage/errorPage.vue')), 'errorPage')
    }
  },
  {
    path: '/page',
    component: r => {
      require.ensure([], () => r(require('./view/page/page.vue')), 'page')
    }
  }
];

结果（正确拿到name）：

但是！！！！！使用import：

const routes = [
  {
    path: '/',
    component: () => import(/* webpackChunkName: "index" */ './view/index/index.vue')
  },
  {
    path: '/errorPage',
    component: () => import(/* webpackChunkName: "errorPage" */ './view/errorPage/errorPage.vue')
  },
  {
    path: '/page',
    component: () => import(/* webpackChunkName: "page" */ './view/page/page.vue')
  }
];

结果不能拿到name：

有人说跟babel设置有关，但我尝试了也没作用：
.babelrc:

{
    "env": {
        "production": {
            "presets": [
                ["env", {
                    "targets": {
                        "browsers": ["last 2 version", "ie 10"]
                    },
                    "modules": false,
                    "debug": true
                }]
            ],
            "plugins": [
                "transform-runtime",
                "transform-object-rest-spread",
                "dynamic-import-webpack"
            ]
        },
        "development": {
            "presets": [
                ["env", {
                    "targets": {
                        "chrome": 60
                    },
                    "modules": false,
                    "debug": true
                }]
            ],
            "plugins": [
                "transform-object-rest-spread",
                "dynamic-import-webpack"
            ]
        }
    }
}

向各位大佬求解