Test these commands.

Refer to this.

1. JavaScript, $yarn nodemon test.js
2. Python, $yarn nodemon test.py
3. Go, $yarn nodemon --exec "go run" ./test.go

Use it with Python or Golang if you want a single file app to test features.

Python

Test watchdog if you want more.

Rust

Just use its Cargo watch.

Go

Test reflex and go-wathcer if you want more.