add basic yjs extension with baked in web rtc support (wip)

packages/extension-yjs/index.ts

@@ -0,0 +1,27 @@
+import { Extension } from '@tiptap/core'
+import { keymap } from 'prosemirror-keymap'
+import {
+  redo, undo, yCursorPlugin, ySyncPlugin, yUndoPlugin,
+} from 'y-prosemirror'
+import { WebrtcProvider } from 'y-webrtc'
+import * as Y from 'yjs'
+
+const ydoc = new Y.Doc()
+const provider = new WebrtcProvider('tiptap', ydoc)
+const type = ydoc.getXmlFragment('prosemirror')
+
+export default new Extension()
+  .name('yjs')
+  .plugins(() => {
+    return [
+      ySyncPlugin(type),
+      yCursorPlugin(provider.awareness),
+      yUndoPlugin(),
+      keymap({
+        'Mod-z': undo,
+        'Mod-y': redo,
+        'Mod-Shift-z': redo,
+      }),
+    ]
+  })
+  .create()

packages/extension-yjs/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@tiptap/extension-yjs",
+  "version": "1.0.0",
+  "source": "index.ts",
+  "main": "dist/tiptap-extension-yjs.js",
+  "umd:main": "dist/tiptap-extension-yjs.umd.js",
+  "module": "dist/tiptap-extension-yjs.mjs",
+  "unpkg": "dist/tiptap-extension-yjs.js",
+  "jsdelivr": "dist/tiptap-extension-yjs.js",
+  "files": [
+    "src",
+    "dist"
+  ],
+  "peerDependencies": {
+    "@tiptap/core": "2.x"
+  },
+  "dependencies": {
+    "y-prosemirror": "^0.3.7",
+    "y-webrtc": "^10.1.6",
+    "yjs": "^13.3.2"
+  }
+}