Export `ySyncAnnotation`

[jacobrobertsbaca]

Export the ySyncAnnotation CodeMirror annotation type. This allows others to check if a transaction is a remote transaction using code like this:

import { ySyncAnnotation } from "y-codemirror.next";

function isRemote(tr: Transaction): boolean {
    return !!tr.annotation(ySyncAnnotation);
}

Currently this is not possible as the annotation isn't exported by the package index.js

[jacobrobertsbaca]

Alternatively this could be accomplished by tagging YJS CodeMirror transactions with Transaction.remote inside y-sync.js:

- view.dispatch({ changes, annotations: [ySyncAnnotation.of(this.conf)] })
+ view.dispatch({ changes, annotations: [ySyncAnnotation.of(this.conf), cmState.Transaction.remote] })

to be more true to CodeMirror's existing interface.

[reiji-h]

@dmonad Are you planning to merge this pull request? I also find the changes in this PR very useful.

[dmonad]

Sure, I'll add it to the next release

[reiji-h]

Thank you very much.