webpack.dev.js

const path = require('path');
const { merge } = require('webpack-merge');
const { HotModuleReplacementPlugin } = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const common = require('./webpack.common.js');

module.exports = merge(common, {
  mode: 'development',
  entry: {
    dev: path.resolve(__dirname, './examples/main.js'),
  },
  devtool: 'inline-source-map',
  devServer: {
    contentBase: path.resolve(__dirname, './dist'),
    historyApiFallback: true,
    open: true,
    compress: true,
    hot: true,
    port: 8080,
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'Production',
      template: path.resolve(__dirname, './examples/template.html'), // template file
      filename: 'index.html',
    }),
    new HotModuleReplacementPlugin(),
  ],
  module: {
    rules: [
      {
        test: /\.(scss|css)$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
});