webpack.config.js

const webpack = require("webpack");
var Buffer = require('buffer/').Buffer;
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
module.exports = {
  mode: "development",
  entry: "./src/index.js", // main js
  output: {
    path: path.resolve(__dirname, "dist"), // output folder
    publicPath: "/",
  },
  module: {
    rules: [
      {
        test: /\.?js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/env","@babel/preset-typescript", "@babel/preset-react"],
            plugins: ["@babel/proposal-class-properties","@babel/proposal-object-rest-spread"],
          },
        },
      },
      {
        test: /\.css$/,
        use: [
          "style-loader",
          "css-loader", // for styles
        ],
      },
    ],
  },
  plugins: [
    new webpack.ProvidePlugin({
        Buffer: ['buffer', 'Buffer'],
    }),
    new webpack.ProvidePlugin({
        process: 'process/browser',
    }),
    new HtmlWebpackPlugin({
      template: "./public/index.html", // base html
    }),
  ],
  resolve: {
    extensions: [ '.ts', '.js' ],
    fallback: {
        "stream": require.resolve("stream-browserify"),
        "buffer": require.resolve("buffer")
    }
  },
};