Client-side Webpack configuration for production 

For preparing the client-side code for production, update the config object with the following code in your webpack.config.client.production.js file.

mern-simplesetup/webpack.config.client.production.js:

const config = {
    mode: "production",
    entry: [
        path.join(CURRENT_WORKING_DIR, 'client/main.js')
    ],
    output: {
        path: path.join(CURRENT_WORKING_DIR , '/dist'),
        filename: 'bundle.js',
        publicPath: "/dist/"
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                use: [
                    'babel-loader'
                ]
            }
        ]
    }
}

This will configure Webpack for bundling the React code to be used in production mode, where the hot reloading plugin or debug configuration will no longer be required.