css-loader error webpack.config.js

webpack.config.js

'use strict';

const webpack  = require('webpack'),
      path     = require('path'),
      ETPlugin = require('extract-text-webpack-plugin');


// Entry and build paths.
const PUBLIC_DIR = path.resolve(__dirname, 'public'),
      BUILD_DIR  = path.resolve(PUBLIC_DIR, 'js'),
      APP_DIR    = path.resolve(__dirname, 'client'),
      ENTRY      = path.resolve(APP_DIR, 'pack.js');

// Export the config.
module.exports = {
    entry: {
        app: ENTRY
    },
    output: {
        path: BUILD_DIR,
        filename: '[name].js'
    },
    node: {
        fs: 'empty'
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: ETPlugin.extract({
                    fallback: 'style-loader',
                    use: 'css-loader'
                })
            },
            {
                test: /\.scss$/,
                use: ETPlugin.extract({
                    fallback: 'style-loader',
                    use: [
                        'css-loader',
                        'sass-loader'
                    ]
                })
            },
            {
                test: /\.(png|jpe?g|gif|ico)$/,
                loader: 'file-loader',
                options: {
                    name: '../css/assets/[name].[hash].[ext]'
                }
            },
            {
                test: /\.(woff|woff2|eot|ttf|svg)(\?v=\d+\.\d+\.\d+)?$/,
                loader: 'url-loader',
                options: {
                    limit: 1024,
                    name: '../css/assets/[name].[hash].[ext]'
                }
            },
        ],
    },
    plugins: [
        new ETPlugin({
            filename: '../css/styles.css'
        }),
        new webpack.ContextReplacementPlugin(/moment[\\\/]locale$/, /^\.\/(en)$/)
    ],
    resolve: {
        extensions: ['js', 'jsx', 'css', 'scss', 'sass']
    },
    externals: {
        'jquery': 'jQuery'
    },
    devtool: 'eval',
    devServer: {
        historyApiFallback: true
    }
};