y-prosemirror-update

Repo to reproduce issue in creating yjs upates from Prosemirror transactions. This was initially discussed on the Yjs Community forum.

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To reproduce the issue:

1. Install dependencies:

   npm ci
   

2. Run demo to see that Yjs doc contains "Hello world" text but Prosemirror doc doesn't:

   $ npm run demo
   YJS: {"type":"doc","content":[{"type":"paragraph","attrs":{"style":"","nodeIndent":0,"nodeTextAlignment":""},"content":[{"type":"text","text":"Hello world"}]}]}
   PM:  {"type":"doc","content":[{"type":"paragraph"}]}