Куда 'extract-text-webpack-plugin' сохраняет файлы?

var ExtractTextPlugin = require('extract-text-webpack-plugin');
module.exports = {
    entry: './app.js',
    output: {
        filename: "bundle.js"
    },
    module: {
        loaders: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader'
            },
            {
                test: /\.styl$/,
                loader: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: ["css-loader", "stylus-loader"],
                    publicPath: '/css'
                })
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin('bundle.css')
    ]
};