A simple lazy filesystem watcher for web servers. LazyWatch will watch the filesystem of your project and keep track if any changes have been made. If so, it will re-run your start command, but only when a request has been made to your project's server.
Once installed, run lazywatch -p 3001:3000 -c "go run main.go".
This will proxy traffic from port 3001 to 3000 (where your webserver project would be configured to listen). LazyWatch will run the specified command (go run main.go in this case) and then watch the project's filesystem. On a modified or created file, it will "invalidate" the current command. When another request is made to the webserver, it will first kill the running process and start a fresh one. It will wait until that webserver is healthy until it starts forwarding the traffic again.