webpack.config.js

const webpack = require("webpack");
const path = require("path");
const CopyPlugin = require("copy-webpack-plugin");
const srcDir = path.join(__dirname, "src");

module.exports = {
    entry: {
      app: path.join(srcDir, 'index.tsx'),
      devtools: path.join(srcDir, 'devtools.ts')
    },
    output: {
        path: path.join(__dirname, "dist/js"),
        filename: "[name].js",
    },
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: "ts-loader",
                exclude: /node_modules/,
            },
            {
                test: /\.css$/i,
                use: ["style-loader", "css-loader"],
              },
        ],
    },
    resolve: {
        extensions: [".ts", ".tsx", ".js"],
    },
    plugins: [
        new CopyPlugin({
            patterns: [{ from: ".", to: "../", context: "public" }],
            options: {},
        }),
    ],
    watchOptions: {
        poll: 1000
    }
};