ExtractTextPlugin is deprecated (and only really needed for production)

package.json

@@ -34,7 +34,6 @@
 	},
 	"devDependencies": {
 		"css-loader": "~0.28.11",
-		"extract-text-webpack-plugin": "~4.0.0-beta.0",
 		"file-loader": "~1.1.11",
 		"html-webpack-plugin": "~3.2.0",
 		"url-loader": "~1.0.1",

webpack.config.js

@@ -1,6 +1,5 @@
 const path = require('path');
 const webpack = require('webpack');
-const ExtractTextPlugin = require('extract-text-webpack-plugin');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const server = require('./server/index.js');
 const { formatHeaders } = require('./server/headers.js');
@@ -38,10 +37,7 @@ module.exports = {
 		rules: [
 			{
 				test: /\.css$/,
-				use: ExtractTextPlugin.extract({
-					fallback: 'style-loader',
-					use: 'css-loader'
-				})
+				loader: 'css-loader'
 			},
 			// fonts
 			{
@@ -56,7 +52,6 @@ module.exports = {
 	},
 	plugins: [
 		new webpack.DefinePlugin({ __DEV__: true }),
-		new ExtractTextPlugin('app.css', { allChunks: true }),
 		new HtmlWebpackPlugin({
 			template: 'index.template.html',
 			inject: 'body'