webpack.config.js

/* eslint-disable no-undef */
const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  mode: 'development',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/dist/',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: { presets: ["@babel/env"] }
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: ["style-loader", "css-loader"]
      },
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        use: ["style-loader", "css-loader", "sass-loader"]
      },
    ]
  },
  resolve: { extensions: ["*", ".js", ".jsx"] },
  devServer: {
    contentBase: path.join(__dirname, 'public/'),
    port: 3000,
    publicPath: 'http://localhost:3000/dist/',
    hotOnly: true
  },
  plugins: [new webpack.HotModuleReplacementPlugin()]
}