webpack.config.dev.js

const path = require('path');
const webpack = require('webpack');
const Dotenv = require('dotenv-webpack');

module.exports = {
  entry: {
    app: path.resolve(__dirname, './src/index.jsx')
  },
  output: {
    path: path.join(__dirname, 'dist'),
    publicPath: '/',
    filename: 'bundle.js',
  },
  devtool: 'inline-source-map',
  target: 'web',
  devServer: {
    historyApiFallback: true,
    hot: true,
    inline: true,
    stats: 'errors-only',
    contentBase: path.resolve(__dirname, 'dist')
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.LoaderOptionsPlugin({
      debug: true
    }),
    new Dotenv({
      path: './.env'
    })
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)?$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          { loader: 'css-loader', options: { importLoaders: 1 } }
          // { loader: 'postcss-loader', options: { config: { path: postcssCfg } } }
        ]
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: 'file' },
      { test: /\.(woff|woff2)$/, loader: 'url?prefix=font/&limit=5000' },
      { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: 'url?limit=10000&mimetype=application/octet-stream' },
      { test: /\.svg$/, loader: 'url-loader?limit=10000&mimetype=image/svg+xml' },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {}
          }
        ]
      }
    ]
  },
  resolve: {
    extensions: ['.jsx', '.js', '.scss'],
  }
};