Edit webpack config file (e.g. webpack.config.js). It will generate a separate vendor.js files for vendor packages in node_modules directory.
Note: the following code is based on the work of vuejs-templates/webpack
var webpack = require('webpack')module.exports = { ... plugins: [ ... new webpack.optimize.CommonsChunkPlugin({ name: 'vendor', filename: 'vendor.js', minChunks: function (module, count) { // any required modules inside node_modules are extracted to vendor return ( module.resource && /\.js$/.test(module.resource) && module.resource.indexOf( path.join(__dirname, '../node_modules') ) === 0 ) } }), ], ...};If you are extracting CSS with ExtractTextPlugin and want to generate vendor.css as well, you should replace /\.js$/ with /\.(js|css|sass|scss|less)$/ for the above configuration.