A way to intercept document changes

[angelobdev]

I'm currently learning this library, so this feature might already exist.
For the project I'm building it is necessary to be able to intercept document changes before the patches are applied, so that every client can have full control over the changes.

Just to be clear, every client has a set of documents it can edit, once an edit is performed it is directly pushed over to the remotes. Instead, I need some way to handle those changes (i.e when a client goes back online after a while).

By the way, I'm using React + Vite with a self-hosted sync server.

Edit:
This could be somewhat related to automerge#985