esbuild-dev-router

Express middleware for development with esbuild. Bundles TypeScript/JavaScript source files in memory, serves them directly, and automatically reloads the browser on file changes via Server-Sent Events. Current stable version is 0.8.0. Peer dependency on esbuild >0.17. Key differentiators: zero-config live reload injection, no disk writes, mounts as Express Router, merges loader and plugin configs so you can extend defaults. Best for teams that already use Express and esbuild and want a lightweight dev server without Webpack or Vite.