Webpack Server Render Middleware

webpack-server-render-middleware is a development-focused Express-style middleware designed to integrate Webpack's build process with server-side rendering (SSR) in Node.js applications. It functions similarly to webpack-dev-middleware but specifically handles server-side bundles, exposing the compiled bundle via the `res.serverBundle` property. The package is currently at version 1.0.0, released in 2018, and explicitly supports Webpack 4. It has not seen updates since then, making it incompatible with Webpack 5 and later versions. This middleware is specifically for development and should never be used in production environments due to its inherent design for in-memory bundling and lack of production optimizations or security considerations. Modern alternatives like Vite or the built-in `serverSideRender` option in webpack-dev-middleware (for Webpack 5+) have largely superseded its functionality.