The Webpack-dev-server is not writing files to disk

webpack.config.dev.js

const ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');
const exclude = /node_modules/;

module.exports = {
  entry: {
    "js/bundle": "./js/src/main",
    "css/main": "./sass/main.scss",
    "css/frontpage": "./sass/frontpage.scss"
  },
  output: {
    filename: "[name].js",
    path: path.resolve(__dirname, "./dist")
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        enforce: "pre",
        exclude: exclude,
        use: [
          "babel-loader",
          "eslint-loader"
        ]
      },
      { test: /\.(jpg|png|svg)$/, loader: 'file-loader?name=[name].[ext]?[hash]&publicPath=../&outputPath=images/' },
      { test: /\.(woff|woff2|eot|ttf)$/, loader: 'file-loader?name=[name].[ext]?[hash]&publicPath=../&outputPath=fonts/' },
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'postcss-loader'],
        })
      },
      {
        test: /\.s[ac]ss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: "css-loader",
              options: {
                importLoaders:  1,
                sourceMap: true
              }
            },
            {
              loader: "sass-loader",
              options: {
                sourceMap: true,
                includePaths: [
                  path.resolve(__dirname, './node_modules/bootstrap-sass/assets/stylesheets'),
                ]
              }
            },
          ],
        })
      }
    ]
  },
  devtool: "source-map",
  devServer: {
    contentBase: path.join(__dirname, "./"),
    publicPath: "/Users/Georgios/Development/rocket-internet/INTROCK2/drupal/web/themes/rocket/dist/",
    compress: true,
    port: 9000,
    proxy: {
      "/": "http://ops.rocket-internet.dev/"
    }
  },
  plugins: [
    new ExtractTextPlugin({ // define where to save the file
      filename: "./[name].css",
      allChunks: true,
    }),
  ],
};