webpack软件包`assets-webpack-plugin`在清单vuejs上获取空键

Question

不确定这是Bug还是我应该设置的东西..但是我只是安装并设置了我的配置webpack，却得到了一个空键

配置

webpack.base.conf.js

entry: {
   app: ['./src/main.js'],
},

 .........

plugins: [
    new AssetsPlugin({
        filename: 'manifest.json',
        path: resolve('src/assets'),
        includeAllFileTypes: false,
        fileTypes: ['js', 'jpg', 'woff', 'woff2', 'otf'],
        manifestFirst: true,
        prettyPrint: true,
    })

输出

manifest.json

{
  "app": {
    "js": "/app.js"
  },

  "": {
    "jpg": [
      "/static/img/24_tablet.1142952.jpg",
      "/static/img/10_desktop.0a66f1a.jpg",
      "/static/img/10_mobile.e16be9f.jpg"
     ],
   }
}

版本

package.json

 "dependencies": {
    "assets-webpack-plugin": "^3.9.7",
    "webpack": "^3.6.0",
    "vue": "^2.5.2",
 }