webpack less loader (dev and production) - Creact React App

less-webpack-conf.js

// 1.dev.
     {
      test: /\.less$/,
      include: paths.appSrc,
      loaders: ["style", "css", "less", "postcss"]
     }

//2, production
    {
      test: /\.less$/,
      include: paths.appSrc,
      loader: ExtractTextPlugin.extract('style', 'css?importLoaders=1!postcss!less-loader')
    }

    //plugin
    new ExtractTextPlugin('public/style.css', {
        allChunks: true
    })

For webpack 1