webpack-dev-server成功绑定了html、scss和js文件，输出也在localhost:8080上提供，但dist文件夹没有在本地创建。以下是我的webpack配置：

var extractPlugin = new ExtractTextPlugin({
   filename: 'main.css'
});

module.exports = {
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js',
    },
    devtool: 'inline-source-map',
    devServer: {
      port: 3000
    },
    plugins: [
        extractPlugin,
        new HtmlWebpackPlugin({
            template: 'public/index.html'
        }),
        new CleanWebpackPlugin(['dist'])
    ]
};

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