这是报错信息。
下面是配置信息：

var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var autoprefixer = require('autoprefixer');
var config = {
    entry: {
        index: "./src/main.js",
        vendor: [
            "react",
            "react-dom"
        ]
    },
    output: {
        path: "./dist/javascripts/",
        filename: "[name].js",
        publicPath: "./dist/"
    },
    watch: true,
    module: {
        loaders: [{
            test: /\.js$/,
            exclude: /node_modules/,
            loader: "babel",
            query: {
                presets: ['es2015', 'stage-0', 'react']
            }
        }, {
            test: /\.css$/,
            loader: ExtractTextPlugin.extract("style-loader", "css-loader!postcss-loader")
        }, {
            test: /\.scss$/,
            loader: 'style!css!sass'
        }]
    },
    postcss: [autoprefixer],
    plugins: [
        new webpack.optimize.CommonsChunkPlugin( /* chunkName= */ "vendor", /* filename= */ "vendor.bundle.js"),
        new ExtractTextPlugin("css/index.css")
    ]
}

if(process.env.NODE_ENV === 'production') {
    config.plugins.push(
        new webpack.optimize.UglifyJsPlugin({
          compress: {
            warnings: false
          }
        })
    )
}

module.exports = config;