fix(unique-id): do not attempt to append to y-sync plugin transactions

packages/core/src/editor/BlockNoteEditor.test.ts

@@ -5,6 +5,7 @@ import {
 } from "../api/getBlockInfoFromPos.js";
 import { BlockNoteEditor } from "./BlockNoteEditor.js";
 import { BlockNoteExtension } from "./BlockNoteExtension.js";
+import * as Y from "yjs";
 
 /**
  * @vitest-environment jsdom
@@ -146,3 +147,67 @@ it("onCreate event", () => {
   });
   expect(created).toBe(true);
 });
+
+it("sets an initial block id when using Y.js", async () => {
+  const doc = new Y.Doc();
+  const fragment = doc.getXmlFragment("doc");
+  let transactionCount = 0;
+  const editor = BlockNoteEditor.create({
+    collaboration: {
+      fragment,
+      user: { name: "Hello", color: "#FFFFFF" },
+      provider: null,
+    },
+    _tiptapOptions: {
+      onTransaction: () => {
+        transactionCount++;
+      },
+    },
+  });
+
+  editor.mount(document.createElement("div"));
+
+  expect(editor.prosemirrorState.doc.toJSON()).toMatchInlineSnapshot(`
+    {
+      "content": [
+        {
+          "content": [
+            {
+              "attrs": {
+                "id": "initialBlockId",
+              },
+              "content": [
+                {
+                  "attrs": {
+                    "backgroundColor": "default",
+                    "textAlignment": "left",
+                    "textColor": "default",
+                  },
+                  "type": "paragraph",
+                },
+              ],
+              "type": "blockContainer",
+            },
+          ],
+          "type": "blockGroup",
+        },
+      ],
+      "type": "doc",
+    }
+  `);
+  expect(transactionCount).toBe(1);
+  // The fragment should not be modified yet, since the editor's content is only the initial content
+  expect(fragment.toJSON()).toMatchInlineSnapshot(`""`);
+
+  editor.replaceBlocks(editor.document, [
+    {
+      type: "paragraph",
+      content: [{ text: "Hello", styles: {}, type: "text" }],
+    },
+  ]);
+  expect(transactionCount).toBe(2);
+  // Only after a real modification is made, will the fragment be updated
+  expect(fragment.toJSON()).toMatchInlineSnapshot(
+    `"<blockgroup><blockcontainer id="0"><paragraph backgroundColor="default" textAlignment="left" textColor="default">Hello</paragraph></blockcontainer><blockcontainer id="1"><paragraph backgroundColor="default" textAlignment="left" textColor="default"></paragraph></blockcontainer></blockgroup>"`,
+  );
+});

packages/core/src/editor/BlockNoteEditor.ts

@@ -917,6 +917,25 @@ export class BlockNoteEditor<
       );
     }
 
+    // When y-prosemirror creates an empty document, the `blockContainer` node is created with an `id` of `null`.
+    // This causes the unique id extension to generate a new id for the initial block, which is not what we want
+    // Since it will be randomly generated & cause there to be more updates to the ydoc
+    // This is a hack to make it so that anytime `schema.doc.createAndFill` is called, the initial block id is already set to "initialBlockId"
+    let cache: Node | undefined = undefined;
+    const oldCreateAndFill = this.pmSchema.nodes.doc.createAndFill;
+    this.pmSchema.nodes.doc.createAndFill = (...args: any) => {
+      if (cache) {
+        return cache;
+      }
+      const ret = oldCreateAndFill.apply(this.pmSchema.nodes.doc, args)!;
+
+      // create a copy that we can mutate (otherwise, assigning attrs is not safe and corrupts the pm state)
+      const jsonNode = JSON.parse(JSON.stringify(ret.toJSON()));
+      jsonNode.content[0].content[0].attrs.id = "initialBlockId";
+
+      cache = Node.fromJSON(this.pmSchema, jsonNode);
+      return cache;
+    };
     this.pmSchema.cached.blockNoteEditor = this;
 
     // Initialize managers

packages/core/src/extensions/Collaboration/__snapshots__/fork-yjs-snap-editor-forked.json

@@ -8,7 +8,7 @@
         "type": "text",
       },
     ],
-    "id": "3",
+    "id": "2",
     "props": {
       "backgroundColor": "default",
       "textAlignment": "left",
@@ -19,7 +19,7 @@
   {
     "children": [],
     "content": [],
-    "id": "4",
+    "id": "3",
     "props": {
       "backgroundColor": "default",
       "textAlignment": "left",

packages/core/src/extensions/Collaboration/__snapshots__/fork-yjs-snap-editor.json

@@ -8,7 +8,7 @@
         "type": "text",
       },
     ],
-    "id": "1",
+    "id": "0",
     "props": {
       "backgroundColor": "default",
       "textAlignment": "left",
@@ -19,7 +19,7 @@
   {
     "children": [],
     "content": [],
-    "id": "2",
+    "id": "1",
     "props": {
       "backgroundColor": "default",
       "textAlignment": "left",

packages/core/src/extensions/Collaboration/__snapshots__/fork-yjs-snap-forked.html

@@ -1 +1 @@
-<blockgroup><blockcontainer id="3"><paragraph backgroundColor="default" textAlignment="left" textColor="default">Hello World</paragraph></blockcontainer><blockcontainer id="4"><paragraph backgroundColor="default" textAlignment="left" textColor="default"></paragraph></blockcontainer></blockgroup>
+<blockgroup><blockcontainer id="2"><paragraph backgroundColor="default" textAlignment="left" textColor="default">Hello World</paragraph></blockcontainer><blockcontainer id="3"><paragraph backgroundColor="default" textAlignment="left" textColor="default"></paragraph></blockcontainer></blockgroup>

packages/core/src/extensions/Collaboration/__snapshots__/fork-yjs-snap.html

@@ -1 +1 @@
-<blockgroup><blockcontainer id="1"><paragraph backgroundColor="default" textAlignment="left" textColor="default">Hello</paragraph></blockcontainer><blockcontainer id="2"><paragraph backgroundColor="default" textAlignment="left" textColor="default"></paragraph></blockcontainer></blockgroup>
+<blockgroup><blockcontainer id="0"><paragraph backgroundColor="default" textAlignment="left" textColor="default">Hello</paragraph></blockcontainer><blockcontainer id="1"><paragraph backgroundColor="default" textAlignment="left" textColor="default"></paragraph></blockcontainer></blockgroup>