[WIP] Create no-auth Lucid-style diagramming MVP with Yjs

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

You are a senior full-stack engineer. Create a no-auth, all-open-source, Lucid-style diagramming MVP as a Vite React + TypeScript SPA with a thin Node websocket server for Yjs realtime sync. Use ONLY open-source libs.

0) Project + deps

• If a folder doesn’t exist yet, initialize with: npm create vite@latest lucid-mvp -- --template react-ts
• Work inside the lucid-mvp folder.
• Install runtime deps:
  npm i reactflow yjs y-websocket elkjs html-to-image ws
• Install dev deps:
  npm i -D concurrently nodemon @types/node
• Update package.json:
  • Add "type": "module"
  • Add scripts:
    {
    "dev": "concurrently "npm:dev:client" "npm:dev:server"",
    "dev:client": "vite",
    "dev:server": "nodemon server.js",
    "build": "vite build",
    "preview": "vite preview"
    }

1) Node Yjs websocket server

Create server.js with EXACT contents:

---

import http from "http";
import { WebSocketServer } from "ws";
import { setupWSConnection } from "y-websocket/bin/utils.js";

const server = http.createServer((req, res) => {
res.writeHead(200);
res.end("y-websocket up");
});

const wss = new WebSocketServer({ server });
wss.on("connection", (ws, req) => {
setupWSConnection(ws, req, { gc: true });
});

const PORT = 1234;
server.listen(PORT, () => console.log(Yjs ws server :${PORT}));

2) Global CSS

Create/overwrite src/index.css with EXACT contents:

---

html, body, #root { height: 100%; margin: 0; }

.toolbar {
position: absolute; left: 8px; top: 56px; width: 160px;
background: #fff; border: 1px solid #eee; border-radius: 8px; padding: 8px;
z-index: 10;
}
.palette-item {
border: 1px dashed #bbb; border-radius: 6px; padding: 8px; margin: 6px 0;
cursor: grab; user-select: none; font-size: 13px;
}
.cursors-overlay {
position: absolute; inset: 0; pointer-events: none; z-index: 9;
}
.cursor {
position: absolute; transform: translate(0,0);
display: flex; align-items: center;
}
.cursor-dot { width: 10px; height: 10px; border-radius: 50%; }
.cursor-label {
font-size: 11px; padding: 2px 6px; border-radius: 4px; color: #000;
margin-left: 6px; opacity: 0.9; background: rgba(255,255,255,0.8);
}

3) Node components (shapes/comments)

Create folder src/nodes and add three files with EXACT contents:

A) src/nodes/EllipseNode.tsx

import { NodeProps } from "reactflow";

export default function EllipseNode({ id, data }: NodeProps) {
const onChange = (e: React.ChangeEvent) =>
data?.onChange?.(id, { label: e.target.value });

return (
<div style={{
width: 160, height: 80, border: "1px solid #999",
borderRadius: 999, background: "#fff",
display: "flex", alignItems: "center", justifyContent: "center", padding: 6
}}>
<input
value={data?.label ?? ""}
onChange={onChange}
style={{ width: 130, border: "none", outline: "none", textAlign: "center", background: "transparent" }}
placeholder="Ellipse"
/>

);
}

B) src/nodes/DiamondNode.tsx

import { NodeProps } from "reactflow";

export default function DiamondNode({ id, data }: NodeProps) {
const onChange = (e: React.ChangeEvent) =>
data?.onChange?.(id, { label: e.target.value });

const size = 120;
return (
<div style={{
width: size, height: size, transform: "rotate(45deg)", background: "#fff",
border: "1px solid #999", display: "flex", alignItems: "center", justifyContent: "center"
}}>
<div style={{ transform: "rotate(-45deg)", width: "80%" }}>
<input
value={data?.label ?? ""}
onChange={onChange}
style={{ width: "100%", border: "none", outline: "none", background: "transparent", textAlign: "center" }}
placeholder="Decision"
/>


);
}

C) src/nodes/StickyNoteNode.tsx

import { NodeProps } from "reactflow";

export default function StickyNoteNode({ id, data }: NodeProps) {
const onChange = (e: React.ChangeEvent) =>
data?.onChange?.(id, { label: e.target.value });

return (
<div style={{
width: 200, height: 140, background: "#FFF9A8",
border: "1px solid #E6DA6E", boxShadow: "0 2px 6px rgba(0,0,0,0.08)",
padding: 8, display: "flex", flexDirection: "column"
}}>
<textarea
value={data?.label ?? ""}
onChange={onChange}
placeholder="Comment…"
style={{ flex: 1, resize: "none", border: "none", outline: "none", background: "transparent" }}
/>

);
}
----------------...

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}