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test: add a ghost writer demo (#1642)
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‎examples/07-collaboration/06-ghost-writer/.bnexample.json‎

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{
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"playground": true,
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"docs": false,
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"author": "nperez0111",
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"tags": ["Advanced", "Development", "Collaboration"],
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"dependencies": {
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"y-partykit": "^0.0.25",
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"yjs": "^13.6.15"
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}
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}

‎examples/07-collaboration/06-ghost-writer/App.tsx‎

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import "@blocknote/core/fonts/inter.css";
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import "@blocknote/mantine/style.css";
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import { BlockNoteView } from "@blocknote/mantine";
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import { useCreateBlockNote } from "@blocknote/react";
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import YPartyKitProvider from "y-partykit/provider";
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import * as Y from "yjs";
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import "./styles.css";
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import { useEffect, useState } from "react";
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// eslint-disable-next-line import/no-extraneous-dependencies
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import { EditorView } from "prosemirror-view";
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const params = new URLSearchParams(window.location.search);
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const ghostWritingRoom = params.get("room");
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const ghostWriterIndex = parseInt(params.get("index") || "1");
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const isGhostWriting = Boolean(ghostWritingRoom);
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const roomName = ghostWritingRoom || `ghost-writer-${Date.now()}`;
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// Sets up Yjs document and PartyKit Yjs provider.
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const doc = new Y.Doc();
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const provider = new YPartyKitProvider(
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"blocknote-dev.yousefed.partykit.dev",
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// Use a unique name as a "room" for your application.
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roomName,
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doc,
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);
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/**
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* Y-prosemirror has an optimization, where it doesn't send awareness updates unless the editor is currently focused.
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* So, for the ghost writers, we override the hasFocus method to always return true.
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*/
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if (isGhostWriting) {
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EditorView.prototype.hasFocus = () => true;
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}
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const ghostContent =
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"This demo shows a two-way sync of documents. It allows you to test collaboration features, and see how stable the editor is. ";
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export default function App() {
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const [numGhostWriters, setNumGhostWriters] = useState(1);
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const [isPaused, setIsPaused] = useState(false);
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const editor = useCreateBlockNote({
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collaboration: {
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// The Yjs Provider responsible for transporting updates:
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provider,
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// Where to store BlockNote data in the Y.Doc:
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fragment: doc.getXmlFragment("document-store"),
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// Information (name and color) for this user:
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user: {
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name: isGhostWriting
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? `Ghost Writer #${ghostWriterIndex}`
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: "My Username",
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color: isGhostWriting ? "#CCCCCC" : "#00ff00",
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},
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},
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});
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useEffect(() => {
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if (!isGhostWriting || isPaused) {
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return;
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}
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let index = 0;
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let timeout: NodeJS.Timeout;
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const scheduleNextChar = () => {
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const jitter = Math.random() * 200; // Random delay between 0-200ms
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timeout = setTimeout(() => {
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const firstBlock = editor.document?.[0];
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if (firstBlock) {
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editor.insertInlineContent(ghostContent[index], {
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updateSelection: true,
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});
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index = (index + 1) % ghostContent.length;
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}
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scheduleNextChar();
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}, 50 + jitter);
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};
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scheduleNextChar();
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return () => clearTimeout(timeout);
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}, [editor, isPaused]);
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// Renders the editor instance.
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return (
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<>
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{isGhostWriting ? (
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<button onClick={() => setIsPaused((a) => !a)}>
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{isPaused ? "Resume Ghost Writer" : "Pause Ghost Writer"}
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</button>
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) : (
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<>
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<button onClick={() => setNumGhostWriters((a) => a + 1)}>
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Add a Ghost Writer
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</button>
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<button onClick={() => setNumGhostWriters((a) => a - 1)}>
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Remove a Ghost Writer
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</button>
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<button
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onClick={() => {
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window.open(
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`${window.location.origin}${window.location.pathname}?room=${roomName}&index=-1`,
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"_blank",
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);
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}}>
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Ghost Writer in a new window
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</button>
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</>
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)}
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<BlockNoteView editor={editor} />
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{!isGhostWriting && (
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<div className="two-way-sync">
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{Array.from({ length: numGhostWriters }).map((_, index) => (
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<iframe
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src={`${window.location.origin}${
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window.location.pathname
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}?room=${roomName}&index=${index + 1}&hideMenu=true`}
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title="ghost writer"
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className="ghost-writer"
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/>
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))}
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</div>
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)}
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</>
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);
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}

‎examples/07-collaboration/06-ghost-writer/README.md‎

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# Ghost Writer
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In this example, we use a local Yjs document to store the document state, and have a ghost writer that edits the document in real-time.
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**Try it out:** Open this page in a new browser tab or window to see it in action!
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**Relevant Docs:**
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- [Editor Setup](/docs/editor-basics/setup)

‎examples/07-collaboration/06-ghost-writer/index.html‎

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<html lang="en">
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<head>
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<script>
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<!-- AUTO-GENERATED FILE, DO NOT EDIT DIRECTLY -->
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</script>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Ghost Writer</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="./main.tsx"></script>
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</body>
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</html>

‎examples/07-collaboration/06-ghost-writer/main.tsx‎

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// AUTO-GENERATED FILE, DO NOT EDIT DIRECTLY
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import React from "react";
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import { createRoot } from "react-dom/client";
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import App from "./App.jsx";
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const root = createRoot(document.getElementById("root")!);
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root.render(
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<React.StrictMode>
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<App />
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</React.StrictMode>
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);

‎examples/07-collaboration/06-ghost-writer/package.json‎

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{
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"name": "@blocknote/example-ghost-writer",
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"description": "AUTO-GENERATED FILE, DO NOT EDIT DIRECTLY",
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"private": true,
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"version": "0.12.4",
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"scripts": {
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"start": "vite",
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"dev": "vite",
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"build:prod": "tsc && vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"@blocknote/core": "latest",
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"@blocknote/react": "latest",
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"@blocknote/ariakit": "latest",
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"@blocknote/mantine": "latest",
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"@blocknote/shadcn": "latest",
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"react": "^18.3.1",
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"react-dom": "^18.3.1",
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"y-partykit": "^0.0.25",
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"yjs": "^13.6.15"
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},
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"devDependencies": {
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"@types/react": "^18.0.25",
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"@types/react-dom": "^18.0.9",
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"@vitejs/plugin-react": "^4.3.1",
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"vite": "^5.3.4"
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}
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}

‎examples/07-collaboration/06-ghost-writer/styles.css‎

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.two-way-sync {
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display: flex;
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flex-direction: row;
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height: 100%;
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margin-top: 10px;
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gap: 8px;
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}
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.ghost-writer {
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flex: 1;
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border: 1px solid #ccc;
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}

‎examples/07-collaboration/06-ghost-writer/tsconfig.json‎

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{
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"__comment": "AUTO-GENERATED FILE, DO NOT EDIT DIRECTLY",
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"compilerOptions": {
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"target": "ESNext",
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"useDefineForClassFields": true,
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"lib": [
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"DOM",
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"DOM.Iterable",
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"ESNext"
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],
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"allowJs": false,
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"skipLibCheck": true,
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"esModuleInterop": false,
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"allowSyntheticDefaultImports": true,
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"strict": true,
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"forceConsistentCasingInFileNames": true,
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"module": "ESNext",
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"moduleResolution": "bundler",
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"resolveJsonModule": true,
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"isolatedModules": true,
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"noEmit": true,
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"jsx": "react-jsx",
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"composite": true
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},
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"include": [
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"."
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],
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"__ADD_FOR_LOCAL_DEV_references": [
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{
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"path": "../../../packages/core/"
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},
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{
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"path": "../../../packages/react/"
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}
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]
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}

‎examples/07-collaboration/06-ghost-writer/vite.config.ts‎

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// AUTO-GENERATED FILE, DO NOT EDIT DIRECTLY
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import react from "@vitejs/plugin-react";
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import * as fs from "fs";
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import * as path from "path";
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import { defineConfig } from "vite";
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// import eslintPlugin from "vite-plugin-eslint";
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// https://vitejs.dev/config/
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export default defineConfig((conf) => ({
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plugins: [react()],
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optimizeDeps: {},
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build: {
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sourcemap: true,
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},
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resolve: {
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alias:
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conf.command === "build" ||
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!fs.existsSync(path.resolve(__dirname, "../../packages/core/src"))
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? {}
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: ({
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// Comment out the lines below to load a built version of blocknote
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// or, keep as is to load live from sources with live reload working
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"@blocknote/core": path.resolve(
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__dirname,
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"../../packages/core/src/"
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),
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"@blocknote/react": path.resolve(
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__dirname,
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"../../packages/react/src/"
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),
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} as any),
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},
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}));

‎packages/core/src/editor/BlockNoteEditor.ts‎

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*
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* @param content can be a string, or array of partial inline content elements
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*/
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public insertInlineContent(content: PartialInlineContent<ISchema, SSchema>) {
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public insertInlineContent(
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content: PartialInlineContent<ISchema, SSchema>,
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{ updateSelection = false }: { updateSelection?: boolean } = {},
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) {
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const nodes = inlineContentToNodes(content, this.pmSchema);
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this.transact((tr) => {
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to: tr.selection.to,
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},
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nodes,
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{
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updateSelection,
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},
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);
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});
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}

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