javascript - gulp+webpack+vue 出现奇怪的打包结果

main.js入口文件

import Vue from 'vue'
import App from './App.vue'

new Vue({
  el: '#app',
  render: h => h(App)
})

gulpfile.js

gulp.task('default', function() {
  console.log('aa')
  return gulp.src('./src/main.js')
    .pipe(named())
    .pipe(webpack(config))
    .pipe(gulp.dest(folder.dist));
});

打包后的代码,部分如下

 function(module, exports) {

    eval("import Vue from 'vue'\nimport App from './App.vue'\n\nnew Vue({\n  el: '#app',\n  render: h => h(App)\n})\n\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,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");

/***/ }

为啥没有打包 import 引入的Vue和 .vue文件呢？