webpack.config.js

module.exports = {
    mode: "production",

    // Enable sourcemaps for debugging webpack's output.
    devtool: "source-map",

    resolve: {
        // Add '.ts' and '.tsx' as resolvable extensions.
        extensions: [".js", ".ts", ".tsx"]
    },

    module: {
        rules: [
            {
                test: /\.(ts|js)x?$/,
                exclude: /node_modules/,
                use: [
                    {
                        loader: "ts-loader"
                    }
                ]
            },
            // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
            {
                enforce: "pre",
                test: /\.js$/,
                loader: "source-map-loader"
            }
        ]
    },

    // // When importing a module whose path matches one of the following, just
    // // assume a corresponding global variable exists and use that instead.
    // // This is important because it allows us to avoid bundling all of our
    // // dependencies, which allows browsers to cache those libraries between builds.
    // externals: {
    //     "lightning/navigation": "lightning"
    //     // "react-dom": "ReactDOM"
    // }
};