vue-cli2 npm run build --report 有两个 js 重复压缩了多次？ 为何？ 怎么处理？

求大佬帮忙。

图片见： https://sm.ms/image/YgAs86KRlboviXp 左侧

webpack 默认的配置 没动过

    new webpack.optimize.CommonsChunkPlugin({
            name: 'vendor',
            minChunks (module) {
                // any required modules inside node_modules are extracted to vendor
                // 将所有依赖于 node_modules 下面文件打包到 vendor 中
                return (
                    module.resource &&
                    /\.js$/.test(module.resource) &&
                    module.resource.indexOf(
                        path.join(__dirname, '../node_modules')
                    ) === 0
                )
            }
        }),
        // extract webpack runtime and module manifest to its own file in order to
        // prevent vendor hash from being updated whenever app bundle is updated
        // 把 webpack 的 runtime 代码和 module manifest 代码提取到 manifest 文件中，防止修改了代码但是没有修改第三方库文件导致第三方库文件也打包的问题
        new webpack.optimize.CommonsChunkPlugin({
            name: 'manifest',
            minChunks: Infinity
        }),
        // This instance extracts shared chunks from code splitted chunks and bundles them
        // in a separate chunk, similar to the vendor chunk
        // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
        new webpack.optimize.CommonsChunkPlugin({
            name: 'app',
            async: 'vendor-async',
            children: true,
            minChunks: 3
        }),