webpack.config.js

'use strict';

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const extractSass = new ExtractTextPlugin({
  filename: 'styles.css',
});

module.exports = {
  devtool: 'eval-source-map',
  entry: [
    'babel-polyfill',
    'webpack-dev-server/client?http://localhost:3000',
    path.join(__dirname, 'app/index.js')
  ],
  output: {
    path: path.join(__dirname, '/dist/'),
    filename: '[name].js',
    publicPath: '/'
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'app/index.html',
      inject: 'body',
      filename: 'index.html'
    }),
    new webpack.ProvidePlugin({
      $: "jquery",
      jQuery: "jquery",
      Popper: ['popper.js', 'default']
    }),
    extractSass,
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('development')
    })
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        enforce: 'pre',
        loader: 'eslint-loader',
        options: {
          configFile: '.eslintrc',
          failOnWarning: false,
          failOnError: false
        }
      },
      {
        test: /\.js?$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.(scss)$/,
        use: extractSass.extract({
          fallback: 'style-loader',
          use: [
            "css-loader",
            "postcss-loader",
            "sass-loader"
          ]
        }),
      }
    ]
  }
};