[eysi]

Garden[1] is a tool we built (yes, I'm affiliated :)) that has a lot of this functionality built-in. Might fit your use case.

We recently re-wrote the hot reload functionality to use Mutagen[2] under the hood and it's insanely fast (<200ms anecdotally). It also does two way sync which can be useful. The old implementation used rsync but a lot of our Windows users struggled with that. So I figured I'd share in case that sounds familiar.

What happens after a sync event depends on the stack, but we've had pretty good success with Entr[3]. We often have it watch a single file so that multiple watchers in a shared dev cluster don't eat up all the node's resources.

1: https://github.com/garden-io/garden 2: https://mutagen.io/ 3: http://eradman.com/entrproject/