webpack.config.js

const HtmlWebPackPlugin = require("html-webpack-plugin");
const path = require("path");

module.exports = {
  entry: "./src/index.js",
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "bundle.js",
    publicPath: "/"
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.(css|scss|sass)$/,
        use: ["style-loader", "css-loader", "sass-loader"]
      }
    ]
  },
  devServer: {
    port: 3000,
    open: true,
    historyApiFallback: true,
    contentBase: "./"
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: "./public/index.html",
      filename: "./index.html"
    })
  ]
};