webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const webpack = require('webpack');
const env = process.env.NODE_ENV

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist')
  },
  resolve: {
    extensions: ['.js'],
    alias: {
      '@': path.resolve(__dirname, 'src/')
    }
  },
  devtool: env === 'development' ? 'inline-source-map' : false,
  devServer: {
    contentBase: './src/',
    hot: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: './src/index.html',
    }),
    new CleanWebpackPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new CopyPlugin([
      { from: 'src/assets', to: 'assets' }
    ])
  ],
  module: {
    rules: [
      {
        enforce: "pre",
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "eslint-loader",
        options: {
          formatter: "codeframe",
        },
      },
      {
        test: /\.css$/,
        use: [
          'css-loader'
        ]
      },
      {
        test: /\.(png|jpg|gif|svg)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]?[hash]'
        }
      },
    ],
  }
};