update readme

Responsive single-column layout (max 480px) with styles for:
- Option items with label/vote-button rows
- Voted state highlighting (green tint)
- Active/closed timer color states
- Disabled button opacity
- Full-width copy URL button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -1 +1 @@
-node_modules/
+node_modules/

README.md

@@ -1,28 +1,55 @@
-# P2P Poll App
-
-## Install npm packages
-```
-npm init -y
-npm install
-```
-
-Note: the frontend obtains the packages `yjs` and `y-websocket` dynamically.
-
-## Run backend
-```
-node backend.js
-```
-
-### Note on Yjs suggestion
-Note that the following server setup is suggested in the Yjs docs (https://docs.yjs.dev/ecosystem/connection-provider/y-websocket):
-```
-npm install y-websocket-server
-HOST=localhost PORT=1000 npx y-websocket
-```
-
-However, across a range of npm versions, this does not work.
-Nevertheless, the essential code from the `y-websocket-server` package is used here as provided in `utils.js`.
-
-## Run frontend
-Open "frontend.html" in browser.
-
+# P2P Poll App
+
+A peer-to-peer polling app built with [Automerge](https://automerge.org/) and Vanilla JS. No backend required — polls sync in real time across browsers using CRDTs and a WebSocket relay.
+
+## Features
+
+- **Add options** — type an option and press Enter or click "Add Option". Duplicate options (case-insensitive) are rejected with an inline error message.
+- **Vote on options** — click the vote button next to any option. You can vote on multiple options, but only once per option.
+- **Toggle votes** — click your vote again to remove it (the button turns green with a checkmark when you've voted).
+- **Live vote counts** — options are sorted by vote count in descending order and update in real time as votes come in from other users.
+- **2-minute countdown timer** — click "Start 2-min Vote" to begin a shared countdown. Voting is open before and during the countdown. Once the timer expires, all vote buttons are disabled.
+- **Shared timer** — the deadline is stored in the Automerge document, so all peers see the same countdown and voting closes simultaneously for everyone.
+- **Copy URL** — click "Copy URL" to copy the poll link to your clipboard. Share it with others to join the same poll.
+- **P2P sync** — all state (options, votes, timer) syncs across browsers in real time with no central server handling your data.
+
+## How it works
+
+### Tech stack
+
+- **[Automerge](https://automerge.org/)** via `@automerge/vanillajs` — a CRDT library that lets multiple clients concurrently edit shared documents and merge changes without conflicts.
+- **BroadcastChannelNetworkAdapter** — syncs between tabs in the same browser instantly via the browser's BroadcastChannel API.
+- **WebSocketClientAdapter** — syncs across different browsers/devices via a WebSocket relay (`wss://sync.automerge.org`). The relay only forwards CRDT messages; it does not store or interpret your data.
+- **IndexedDBStorageAdapter** — persists the document locally so it survives page refreshes.
+- **Vite** — bundles the app with WebAssembly support (required by Automerge).
+
+### Data model
+
+The poll is a single Automerge document with three fields:
+
+```js
+{
+  options: string[],       // list of poll options in insertion order
+  votes: { [option]: number }, // vote count per option
+  deadline: number | null  // Unix timestamp (ms) when voting closes, or null
+}
+```
+
+### URL-based sharing
+
+Each document gets a unique Automerge URL (e.g. `automerge:abc123...`) stored in the page's URL hash. Opening the same URL in any browser loads and syncs the same document. Creating a new poll generates a new document and updates the hash automatically.
+
+### Voting rules
+
+- Voted options are tracked in `localStorage` (keyed by document URL), so they persist across page refreshes but are isolated per browser.
+- One vote per option per user. Votes can be toggled off and back on until the timer expires.
+- The timer (`doc.deadline`) is set once by whoever clicks "Start 2-min Vote" and is shared via the Automerge document, so all peers use the same deadline.
+
+## Running locally
+
+```bash
+pnpm install
+pnpm dev
+```
+
+Open the printed localhost URL. To test cross-browser sync, copy the URL (including the `#automerge:...` hash) and open it in a different browser.

app.js

@@ -0,0 +1,214 @@
+import {
+  Repo,
+  BroadcastChannelNetworkAdapter,
+  WebSocketClientAdapter,
+  IndexedDBStorageAdapter,
+  isValidAutomergeUrl,
+} from "@automerge/vanillajs";
+
+const REPO = new Repo({
+  network: [
+    new BroadcastChannelNetworkAdapter(),
+    new WebSocketClientAdapter("wss://sync.automerge.org"),
+  ],
+  storage: new IndexedDBStorageAdapter(),
+});
+
+let HANDLE;
+
+function getVotedKey(docUrl) {
+  return `p2p-poll-voted:${docUrl}`;
+}
+
+function getVotedOptions() {
+  const key = getVotedKey(document.location.hash);
+  return new Set(JSON.parse(localStorage.getItem(key) || "[]"));
+}
+
+function markVoted(opt) {
+  const key = getVotedKey(document.location.hash);
+  const voted = getVotedOptions();
+  voted.add(opt);
+  localStorage.setItem(key, JSON.stringify([...voted]));
+}
+
+function unmarkVoted(opt) {
+  const key = getVotedKey(document.location.hash);
+  const voted = getVotedOptions();
+  voted.delete(opt);
+  localStorage.setItem(key, JSON.stringify([...voted]));
+}
+
+const locationHash = document.location.hash.substring(1);
+const statusEl = document.getElementById("status");
+const optionsList = document.getElementById("options-list");
+const optionInput = document.getElementById("option-input");
+const addBtn = document.getElementById("add-btn");
+const duplicateMsg = document.getElementById("duplicate-msg");
+const copyBtn = document.getElementById("copy-btn");
+const timerEl = document.getElementById("timer");
+const startVotingBtn = document.getElementById("start-voting-btn");
+
+if (isValidAutomergeUrl(locationHash)) {
+  statusEl.textContent = "Loading document…";
+  try {
+    HANDLE = await REPO.find(locationHash);
+    statusEl.textContent = "";
+  } catch (err) {
+    statusEl.textContent = "Could not load document. Starting a new one.";
+    HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
+    document.location.hash = HANDLE.url;
+  }
+} else {
+  HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
+  document.location.hash = HANDLE.url;
+}
+
+HANDLE.on("change", ({ doc }) => render(doc));
+
+const initialDoc = HANDLE.doc();
+if (initialDoc) render(initialDoc);
+
+let timerInterval = null;
+
+function render(doc) {
+  renderOptions(doc);
+  renderTimer(doc);
+}
+
+function renderOptions(doc) {
+  const votes = doc.votes || {};
+  const deadline = doc.deadline ?? null;
+  const now = Date.now();
+  const votingClosed = deadline !== null && now >= deadline;
+  const votedOptions = getVotedOptions();
+
+  const sorted = [...(doc.options || [])].sort(
+    (a, b) => (votes[b] || 0) - (votes[a] || 0),
+  );
+
+  optionsList.innerHTML = "";
+  sorted.forEach((opt) => {
+    const count = votes[opt] || 0;
+    const alreadyVoted = votedOptions.has(opt);
+
+    const item = document.createElement("div");
+    item.className = "option-item";
+
+    const label = document.createElement("span");
+    label.className = "option-label";
+    label.textContent = opt;
+
+    const voteBtn = document.createElement("button");
+    voteBtn.className = alreadyVoted ? "vote-btn voted" : "vote-btn";
+    voteBtn.textContent = alreadyVoted ? `✓ ${count}` : `▲ ${count}`;
+    voteBtn.disabled = votingClosed;
+    if (votingClosed) voteBtn.title = "Voting is closed";
+    else if (alreadyVoted) voteBtn.title = "Click to remove your vote";
+
+    voteBtn.addEventListener("click", () => {
+      if (alreadyVoted) {
+        unmarkVoted(opt);
+        HANDLE.change((d) => {
+          if (!d.votes) d.votes = {};
+          d.votes[opt] = Math.max(0, (d.votes[opt] || 0) - 1);
+        });
+      } else {
+        markVoted(opt);
+        HANDLE.change((d) => {
+          if (!d.votes) d.votes = {};
+          d.votes[opt] = (d.votes[opt] || 0) + 1;
+        });
+      }
+    });
+
+    item.appendChild(label);
+    item.appendChild(voteBtn);
+    optionsList.appendChild(item);
+  });
+}
+
+function renderTimer(doc) {
+  const deadline = doc?.deadline ?? null;
+  const now = Date.now();
+
+  if (deadline === null) {
+    timerEl.textContent = "";
+    startVotingBtn.hidden = false;
+    return;
+  }
+
+  startVotingBtn.hidden = true;
+
+  if (now >= deadline) {
+    timerEl.textContent = "Voting closed.";
+    timerEl.className = "timer closed";
+    clearInterval(timerInterval);
+    timerInterval = null;
+    return;
+  }
+
+  const remaining = Math.ceil((deadline - now) / 1000);
+  const mins = Math.floor(remaining / 60);
+  const secs = remaining % 60;
+  timerEl.textContent = `Voting closes in ${mins}:${secs.toString().padStart(2, "0")}`;
+  timerEl.className = "timer active";
+
+  if (!timerInterval) {
+    timerInterval = setInterval(() => {
+      const d = HANDLE.doc();
+      if (!d) return;
+      renderTimer(d);
+      renderOptions(d);
+      if (Date.now() >= d.deadline) {
+        clearInterval(timerInterval);
+        timerInterval = null;
+      }
+    }, 1000);
+  }
+}
+
+startVotingBtn.addEventListener("click", () => {
+  HANDLE.change((d) => {
+    d.deadline = Date.now() + 2 * 60 * 1000;
+  });
+});
+
+addBtn.addEventListener("click", () => {
+  const value = optionInput.value.trim();
+  if (!value) return;
+
+  const doc = HANDLE.doc();
+  const valueLower = value.toLowerCase();
+  const isDuplicate = (doc?.options || []).some(
+    (opt) => opt.toLowerCase() === valueLower,
+  );
+
+  if (isDuplicate) {
+    duplicateMsg.textContent = `"${value}" is already in the list.`;
+    duplicateMsg.hidden = false;
+    return;
+  }
+
+  duplicateMsg.hidden = true;
+  HANDLE.change((d) => {
+    if (!d.options) d.options = [];
+    d.options.push(value);
+  });
+  optionInput.value = "";
+});
+
+optionInput.addEventListener("keydown", (e) => {
+  if (e.key === "Enter") addBtn.click();
+});
+
+optionInput.addEventListener("input", () => {
+  duplicateMsg.hidden = true;
+});
+
+copyBtn.addEventListener("click", () => {
+  navigator.clipboard.writeText(window.location.href).then(() => {
+    copyBtn.textContent = "Copied!";
+    setTimeout(() => (copyBtn.textContent = "Copy URL"), 1500);
+  });
+});

backend.js

@@ -1,31 +0,0 @@
-import { WebSocketServer } from 'ws';
-import { setupWSConnection } from './utils.js'
-
-// Create a WebSocket server
-const WS_PORT = 8080;
-const wss = new WebSocketServer({ port: WS_PORT });
-
-console.log('WebSocket server is running on ws://localhost:' + String(WS_PORT));
-
-// Connection event handler
-wss.on('connection', setupWSConnection);
-/*
-wss.on('connection', (ws) => {
-  console.log('Client connected');
-
-  // Message event handler
-  ws.on('message', (message) => {
-    let msg_str = String(message);
-    console.log("Received: " + msg_str);
-    
-    // If this is a text or state message (no Yjs logic) - echo the message back to the client
-    if (msg_str.startsWith("TEXT_MESSAGE") | msg_str.startsWith("STATE_MESSAGE")) {
-      ws.send(msg_str);
-    }
-  });
-
-  // Close event handler
-  ws.on('close', () => {
-    console.log('Client disconnected');
-  });
-});*/

frontend.html

@@ -1,196 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-  <title>Poll Client</title>
-  <style>
-    body {
-      font-family: Arial, sans-serif;
-      max-width: 600px;
-      margin: 0 auto;
-      padding: 20px;
-    }
-    #messages {
-      height: 300px;
-      border: 1px solid #ccc;
-      overflow-y: auto;
-      padding: 10px;
-      margin-bottom: 10px;
-    }
-    .message { margin: 5px 0; }
-  </style>
-</head>
-<body>
-  <h1>Poll Client</h1>
-  <div id="status">Connecting to server...</div>
-  <div id="status2">Connecting to server...</div>
-  <div id="messages"></div>
-  <div>
-    <input type="text" id="messageInput" placeholder="Type your message">
-    <!--button onclick="sendMessage()">Send</button-->
-    <button id="sendBtn">Send</button>
-    <input id="optionInput" placeholder="Add option">
-    <button id="addBtn">Add</button>
-    <ul id="options"></ul>
-  </div>
-
-  <script type="module">
-    import * as Y from "https://esm.sh/yjs"
-    import { WebsocketProvider } from "https://esm.sh/y-websocket"
-
-    const WS_PORT = 8080;
-    const ydoc = new Y.Doc();
-    const status = document.getElementById('status');
-    const status2 = document.getElementById('status2');
-    const messages = document.getElementById('messages');
-    const messageInput = document.getElementById('messageInput');
-
-    // Connect to the backend (WebSocket server) via Yjs WebsocketProvider
-    const wsp = new WebsocketProvider(
-      'ws://localhost:' + String(WS_PORT), 'poll-room',
-      ydoc
-    )
-    wsp.on('status', event => {
-      //console.log("event.status =", event.status)
-      if (event.status == "connected") {
-        status.textContent = 'Yjs connected to WebSocket server';
-        status.style.color = 'green';
-      }
-      else {
-        status.textContent = 'Yjs disonnected from WebSocket server';
-        status.style.color = 'red';
-      }
-    })
-    wsp.onopen = () => {
-      console.log('connected to y-websocket server');
-    };
-    ydoc.on('update', () => {
-      console.log('Yjs document updated locally');
-    });
-    wsp.on('sync', isSynced => {
-      console.log("isSynced =", isSynced)
-    })
-
-    // Connect to the backend (WebSocket server) via common WebSocket (only for informative messages)
-    const ws = new WebSocket('ws://localhost:' + String(WS_PORT));
-    ws.onopen = () => {
-      status2.textContent = 'WebSocket client connected to WebSocket server';
-      status2.style.color = 'green';
-    };
-    ws.onmessage = (event) => {
-      const message = document.createElement('div');
-      message.className = 'message';
-      message.textContent = event.data;
-      messages.appendChild(message);
-      messages.scrollTop = messages.scrollHeight;
-    };
-    ws.onerror = (error) => {
-      status2.textContent = 'Error: ' + error.message;
-      status2.style.color = 'red';
-    };
-    ws.onclose = () => {
-      status2.textContent = 'WebSocket client disconnected from WebSocket server';
-      status2.style.color = 'red';
-    };
-
-    // Function to send a message
-    function sendMessage(command, payload) {
-        let message = "";
-        if (command === "TEXT_MESSAGE") {
-            message = command + ":" + messageInput.value.trim();
-            messageInput.value = "";
-        }
-        else if (command.startsWith("STATE_MESSAGE--")) {
-            message = command + ":" + payload;
-        }
-        else {
-            console.log("Error: unknown command '" + command + "'")
-        }
-
-        if (message) {
-            /* To make compatible with y-websocket-server API:
-            const encoder = encoding.createEncoder()
-            encoding.writeVarUint(encoder, messageTextMessage)
-            syncProtocol.writeUpdate(encoder, update)
-            enc_message = encoding.toUint8Array(encoder)*/
-            ws.send(message);
-        }
-    }
-
-     // Send message on button click
-    document.getElementById("sendBtn").onclick = () => {
-        sendMessage("TEXT_MESSAGE", "");
-    };
-
-    // Send message on Enter key
-    messageInput.addEventListener('keypress', (e) => {
-      if (e.key === 'Enter') {
-        sendMessage("TEXT_MESSAGE", "");
-      }
-    });
-    
-    // Actual poll logic
-    const optionsMap = ydoc.getMap("options");
-
-    const optionsList = document.getElementById("options");
-    const input = document.getElementById("optionInput");
-
-    function render() {
-        optionsList.innerHTML = ""
-
-        optionsMap.forEach((vote, name) => {
-            // List element for this option
-            const li = document.createElement("li")
-
-            // Label for this option
-            const label = document.createElement("span")
-            label.textContent = name + " — " + vote + " "
-
-            // "Vote"/"Unvote" button
-            const voteBtn = document.createElement("button")
-            if (vote == false) {
-                voteBtn.textContent = "Vote"
-            }
-            else {
-                voteBtn.textContent = "Unvote"
-            }
-            voteBtn.onclick = () => {
-                vote = !vote;
-                optionsMap.set(name, vote);
-                sendMessage("STATE_MESSAGE--" + (vote ? "VOTE" : "UNVOTE"), name);
-            }
-
-            // "Remove" button
-            const removeBtn = document.createElement("button")
-            removeBtn.textContent = "Remove"
-            removeBtn.onclick = () => {
-                optionsMap.delete(name);
-                sendMessage("STATE_MESSAGE--REMOVE", name);
-            }
-
-            li.appendChild(label)
-            li.appendChild(voteBtn)
-            li.appendChild(removeBtn)
-
-            optionsList.appendChild(li)
-        })
-    };
-
-    document.getElementById("addBtn").onclick = () => {
-        const name = input.value.trim()
-
-        if (!name) return
-
-        if (!optionsMap.has(name)) {
-            optionsMap.set(name, false);
-            sendMessage("STATE_MESSAGE--ADD_OPTION", name);
-        }
-
-        input.value = ""
-    };
-
-    optionsMap.observe(render);
-
-    render();
-  </script>
-</body>
-</html>

index.html

@@ -0,0 +1,31 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>P2P Polling App</title>
+        <link rel="stylesheet" href="./styles.css" />
+    </head>
+    <body>
+        <div id="app">
+            <h1>P2P Polling App</h1>
+            <div id="status"></div>
+            <div id="add-option">
+                <input
+                    type="text"
+                    id="option-input"
+                    placeholder="Enter an option..."
+                />
+                <button id="add-btn">Add Option</button>
+            </div>
+            <div id="duplicate-msg" hidden></div>
+            <div id="timer-section">
+                <div id="timer"></div>
+                <button id="start-voting-btn">Start 2-min Vote</button>
+            </div>
+            <div id="options-list"></div>
+            <button id="copy-btn">Copy URL</button>
+        </div>
+        <script type="module" src="./app.js"></script>
+    </body>
+</html>

package-lock.json

@@ -1,144 +0,0 @@
-{
-  "name": "yjs-poll",
-  "version": "1.0.0",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "yjs-poll",
-      "version": "1.0.0",
-      "license": "ISC",
-      "dependencies": {
-        "@y/protocols": "^1.0.6-1",
-        "lib0": "^0.2.102",
-        "ws": "^8.19.0",
-        "yjs": "^14.0.0-7"
-      }
-    },
-    "node_modules/@y/protocols": {
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-      "resolved": "https://registry.npmjs.org/@y/protocols/-/protocols-1.0.6-rc.1.tgz",
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-      "license": "MIT",
-      "dependencies": {
-        "lib0": "^1.0.0-rc.1"
-      },
-      "engines": {
-        "node": ">=16.0.0",
-        "npm": ">=8.0.0"
-      },
-      "funding": {
-        "type": "GitHub Sponsors ❤",
-        "url": "https://github.com/sponsors/dmonad"
-      },
-      "peerDependencies": {
-        "@y/y": "*"
-      }
-    },
-    "node_modules/@y/protocols/node_modules/lib0": {
-      "version": "1.0.0-rc.4",
-      "resolved": "https://registry.npmjs.org/lib0/-/lib0-1.0.0-rc.4.tgz",
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-      "license": "MIT",
-      "bin": {
-        "0ecdsa-generate-keypair": "src/bin/0ecdsa-generate-keypair.js",
-        "0gentesthtml": "src/bin/gentesthtml.js",
-        "0serve": "src/bin/0serve.js"
-      },
-      "engines": {
-        "node": ">=16"
-      },
-      "funding": {
-        "type": "GitHub Sponsors ❤",
-        "url": "https://github.com/sponsors/dmonad"
-      }
-    },
-    "node_modules/@y/y": {
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-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
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-      },
-      "engines": {
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-        "url": "https://github.com/sponsors/dmonad"
-      }
-    },
-    "node_modules/isomorphic.js": {
-      "version": "0.2.5",
-      "resolved": "https://registry.npmjs.org/isomorphic.js/-/isomorphic.js-0.2.5.tgz",
-      "integrity": "sha512-PIeMbHqMt4DnUP3MA/Flc0HElYjMXArsw1qwJZcm9sqR8mq3l8NYizFMty0pWwE/tzIGH3EKK5+jes5mAr85yw==",
-      "license": "MIT",
-      "funding": {
-        "type": "GitHub Sponsors ❤",
-        "url": "https://github.com/sponsors/dmonad"
-      }
-    },
-    "node_modules/lib0": {
-      "version": "0.2.117",
-      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.117.tgz",
-      "integrity": "sha512-DeXj9X5xDCjgKLU/7RR+/HQEVzuuEUiwldwOGsHK/sfAfELGWEyTcf0x+uOvCvK3O2zPmZePXWL85vtia6GyZw==",
-      "license": "MIT",
-      "dependencies": {
-        "isomorphic.js": "^0.2.4"
-      },
-      "bin": {
-        "0ecdsa-generate-keypair": "bin/0ecdsa-generate-keypair.js",
-        "0gentesthtml": "bin/gentesthtml.js",
-        "0serve": "bin/0serve.js"
-      },
-      "engines": {
-        "node": ">=16"
-      },
-      "funding": {
-        "type": "GitHub Sponsors ❤",
-        "url": "https://github.com/sponsors/dmonad"
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-    },
-    "node_modules/ws": {
-      "version": "8.19.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
-      "integrity": "sha512-blAT2mjOEIi0ZzruJfIhb3nps74PRWTCz1IjglWEEpQl5XS/UNama6u2/rjFkDDouqr4L67ry+1aGIALViWjDg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=10.0.0"
-      },
-      "peerDependencies": {
-        "bufferutil": "^4.0.1",
-        "utf-8-validate": ">=5.0.2"
-      },
-      "peerDependenciesMeta": {
-        "bufferutil": {
-          "optional": true
-        },
-        "utf-8-validate": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/yjs": {
-      "version": "14.0.0-16",
-      "resolved": "https://registry.npmjs.org/yjs/-/yjs-14.0.0-16.tgz",
-      "integrity": "sha512-n7jMrQz4pgU/NFnf4qY53K2adR/fu6ViQ79qVIw6Og+BtuDs1hx3DjOi3iREVnA6tsxQXXVG3gvG0I2kpmAwoQ==",
-      "license": "MIT",
-      "dependencies": {
-        "lib0": "^0.2.115-6"
-      },
-      "engines": {
-        "node": ">=16.0.0",
-        "npm": ">=8.0.0"
-      },
-      "funding": {
-        "type": "GitHub Sponsors ❤",
-        "url": "https://github.com/sponsors/dmonad"
-      }
-    }
-  }
-}

package.json

@@ -1,20 +1,23 @@
 {
-  "name": "yjs-poll",
-  "version": "1.0.0",
-  "main": "index.js",
+  "name": "p2p-poll-app",
   "type": "module",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "y-websocket": "y-websocket"
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
   },
-  "keywords": [],
-  "author": "",
-  "license": "ISC",
-  "description": "",
   "dependencies": {
-    "ws": "^8.19.0",
-    "@y/protocols": "^1.0.6-1",
-    "lib0": "^0.2.102",
-    "yjs": "^14.0.0-7"
+    "@automerge/automerge-repo": "^2.0.0",
+    "@automerge/automerge-repo-network-websocket": "^2.0.0",
+    "@automerge/automerge-repo-storage-indexeddb": "^2.0.0",
+    "@automerge/vanillajs": "^2.5.3"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0",
+    "vite-plugin-top-level-await": "^1.4.0",
+    "vite-plugin-wasm": "^3.3.0"
   }
 }

styles.css

@@ -0,0 +1,93 @@
+body {
+    font-family: sans-serif;
+    max-width: 480px;
+    margin: 40px auto;
+    padding: 0 16px;
+}
+
+#add-option {
+    display: flex;
+    gap: 8px;
+    margin-bottom: 8px;
+}
+
+#option-input {
+    flex: 1;
+    padding: 8px;
+    font-size: 1rem;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+}
+
+#duplicate-msg {
+    color: #c00;
+    font-size: 0.9rem;
+    margin-bottom: 12px;
+}
+
+button {
+    padding: 8px 16px;
+    font-size: 1rem;
+    cursor: pointer;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: #fff;
+}
+
+button:hover:not(:disabled) {
+    background: #f0f0f0;
+}
+
+button:disabled {
+    opacity: 0.5;
+    cursor: default;
+}
+
+#timer-section {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    margin-bottom: 16px;
+}
+
+.timer.active {
+    font-weight: bold;
+    color: #1a6e1a;
+}
+
+.timer.closed {
+    font-weight: bold;
+    color: #c00;
+}
+
+.option-item {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 10px 12px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    margin-bottom: 8px;
+}
+
+.option-label {
+    flex: 1;
+}
+
+.vote-btn {
+    padding: 4px 12px;
+    font-size: 0.9rem;
+    white-space: nowrap;
+}
+
+.vote-btn.voted {
+    background: #e6f4e6;
+    border-color: #4a9e4a;
+    color: #2a6e2a;
+}
+
+
+#copy-btn {
+    margin-top: 16px;
+    width: 100%;
+}

utils.js

@@ -1,291 +0,0 @@
-/* Adapted from https://github.com/yjs/y-websocket-server/blob/main/src/server.js, version of 2025-04-02
-   (author: dmonad/Kevin Jahns, MIT license) */
-
-import * as Y from 'yjs'
-import * as syncProtocol from '@y/protocols/sync'
-import * as awarenessProtocol from '@y/protocols/awareness'
-
-import * as encoding from 'lib0/encoding'
-import * as decoding from 'lib0/decoding'
-import * as map from 'lib0/map'
-
-import * as eventloop from 'lib0/eventloop'
-
-/*import { callbackHandler, isCallbackSet } from './callback.js'
-
-const CALLBACK_DEBOUNCE_WAIT = parseInt(process.env.CALLBACK_DEBOUNCE_WAIT || '2000')
-const CALLBACK_DEBOUNCE_MAXWAIT = parseInt(process.env.CALLBACK_DEBOUNCE_MAXWAIT || '10000')
-
-const debouncer = eventloop.createDebouncer(CALLBACK_DEBOUNCE_WAIT, CALLBACK_DEBOUNCE_MAXWAIT)*/
-
-const wsReadyStateConnecting = 0
-const wsReadyStateOpen = 1
-const wsReadyStateClosing = 2 // eslint-disable-line
-const wsReadyStateClosed = 3 // eslint-disable-line
-
-// disable gc when using snapshots!
-const gcEnabled = process.env.GC !== 'false' && process.env.GC !== '0'
-// const persistenceDir = process.env.YPERSISTENCE
-/**
- * @type {{bindState: function(string,WSSharedDoc):void, writeState:function(string,WSSharedDoc):Promise<any>, provider: any}|null}
- */
-let persistence = null
-
-/**
- * @param {{bindState: function(string,WSSharedDoc):void,
- * writeState:function(string,WSSharedDoc):Promise<any>,provider:any}|null} persistence_
- */
-export const setPersistence = persistence_ => {
-  persistence = persistence_
-}
-
-/**
- * @return {null|{bindState: function(string,WSSharedDoc):void,
-  * writeState:function(string,WSSharedDoc):Promise<any>}|null} used persistence layer
-  */
-export const getPersistence = () => persistence
-
-/**
- * @type {Map<string,WSSharedDoc>}
- */
-export const docs = new Map()
-
-const messageSync = 0
-const messageAwareness = 1
-// const messageAuth = 2
-//const messageTextMessage = 3
-//const messageStateMessage = 4
-
-/**
- * @param {Uint8Array} update
- * @param {any} _origin
- * @param {WSSharedDoc} doc
- * @param {any} _tr
- */
-const updateHandler = (update, _origin, doc, _tr) => {
-  const encoder = encoding.createEncoder()
-  encoding.writeVarUint(encoder, messageSync)
-  syncProtocol.writeUpdate(encoder, update)
-  const message = encoding.toUint8Array(encoder)
-  doc.conns.forEach((_, conn) => send(doc, conn, message))
-}
-
-/**
- * @type {(ydoc: Y.Doc) => Promise<void>}
- */
-let contentInitializor = _ydoc => Promise.resolve()
-
-/**
- * This function is called once every time a Yjs document is created. You can
- * use it to pull data from an external source or initialize content.
- *
- * @param {(ydoc: Y.Doc) => Promise<void>} f
- */
-export const setContentInitializor = (f) => {
-  contentInitializor = f
-}
-
-export class WSSharedDoc extends Y.Doc {
-  /**
-   * @param {string} name
-   */
-  constructor (name) {
-    super({ gc: gcEnabled })
-    this.name = name
-    /**
-     * Maps from conn to set of controlled user ids. Delete all user ids from awareness when this conn is closed
-     * @type {Map<Object, Set<number>>}
-     */
-    this.conns = new Map()
-    /**
-     * @type {awarenessProtocol.Awareness}
-     */
-    this.awareness = new awarenessProtocol.Awareness(this)
-    this.awareness.setLocalState(null)
-    /**
-     * @param {{ added: Array<number>, updated: Array<number>, removed: Array<number> }} changes
-     * @param {Object | null} conn Origin is the connection that made the change
-     */
-    const awarenessChangeHandler = ({ added, updated, removed }, conn) => {
-      const changedClients = added.concat(updated, removed)
-      if (conn !== null) {
-        const connControlledIDs = /** @type {Set<number>} */ (this.conns.get(conn))
-        if (connControlledIDs !== undefined) {
-          added.forEach(clientID => { connControlledIDs.add(clientID) })
-          removed.forEach(clientID => { connControlledIDs.delete(clientID) })
-        }
-      }
-      // broadcast awareness update
-      const encoder = encoding.createEncoder()
-      encoding.writeVarUint(encoder, messageAwareness)
-      encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(this.awareness, changedClients))
-      const buff = encoding.toUint8Array(encoder)
-      this.conns.forEach((_, c) => {
-        send(this, c, buff)
-      })
-    }
-    this.awareness.on('update', awarenessChangeHandler)
-    this.on('update', /** @type {any} */ (updateHandler))
-    //if (isCallbackSet) {
-    //  this.on('update', (_update, _origin, doc) => {
-    //    debouncer(() => callbackHandler(/** @type {WSSharedDoc} */ (doc)))
-    //  })
-    //}
-    this.whenInitialized = contentInitializor(this)
-  }
-}
-
-/**
- * Gets a Y.Doc by name, whether in memory or on disk
- *
- * @param {string} docname - the name of the Y.Doc to find or create
- * @param {boolean} gc - whether to allow gc on the doc (applies only when created)
- * @return {WSSharedDoc}
- */
-export const getYDoc = (docname, gc = true) => map.setIfUndefined(docs, docname, () => {
-  const doc = new WSSharedDoc(docname)
-  doc.gc = gc
-  if (persistence !== null) {
-    persistence.bindState(docname, doc)
-  }
-  docs.set(docname, doc)
-  return doc
-})
-
-/**
- * @param {any} conn
- * @param {WSSharedDoc} doc
- * @param {Uint8Array} message
- */
-const messageListener = (conn, doc, message) => {
-  try {
-    const encoder = encoding.createEncoder()
-    const decoder = decoding.createDecoder(new Uint8Array(message))
-    const messageType = decoding.readVarUint(decoder)
-    switch (messageType) {
-      case messageSync:
-        encoding.writeVarUint(encoder, messageSync)
-        syncProtocol.readSyncMessage(decoder, encoder, doc, conn)
-
-        // If the `encoder` only contains the type of reply message and no
-        // message, there is no need to send the message. When `encoder` only
-        // contains the type of reply, its length is 1.
-        if (encoding.length(encoder) > 1) {
-          send(doc, conn, encoding.toUint8Array(encoder))
-        }
-        break
-      case messageAwareness: {
-        awarenessProtocol.applyAwarenessUpdate(doc.awareness, decoding.readVarUint8Array(decoder), conn)
-        break
-      }
-      // If this is a text or a message (no Yjs logic) - echo the message back to the client
-      default: {
-        conn.send(String(message))
-        console.log(String(message))
-        break
-      }
-    }
-  } catch (err) {
-    console.error(err)
-    // @ts-ignore
-    doc.emit('error', [err])
-  }
-}
-
-/**
- * @param {WSSharedDoc} doc
- * @param {any} conn
- */
-const closeConn = (doc, conn) => {
-  if (doc.conns.has(conn)) {
-    /**
-     * @type {Set<number>}
-     */
-    // @ts-ignore
-    const controlledIds = doc.conns.get(conn)
-    doc.conns.delete(conn)
-    awarenessProtocol.removeAwarenessStates(doc.awareness, Array.from(controlledIds), null)
-    if (doc.conns.size === 0 && persistence !== null) {
-      // if persisted, we store state and destroy ydocument
-      persistence.writeState(doc.name, doc).then(() => {
-        doc.destroy()
-      })
-      docs.delete(doc.name)
-    }
-  }
-  conn.close()
-}
-
-/**
- * @param {WSSharedDoc} doc
- * @param {import('ws').WebSocket} conn
- * @param {Uint8Array} m
- */
-const send = (doc, conn, m) => {
-  if (conn.readyState !== wsReadyStateConnecting && conn.readyState !== wsReadyStateOpen) {
-    closeConn(doc, conn)
-  }
-  try {
-    conn.send(m, {}, err => { err != null && closeConn(doc, conn) })
-  } catch (e) {
-    closeConn(doc, conn)
-  }
-}
-
-const pingTimeout = 30000
-
-/**
- * @param {import('ws').WebSocket} conn
- * @param {import('http').IncomingMessage} req
- * @param {any} opts
- */
-export const setupWSConnection = (conn, req, { docName = (req.url || '').slice(1).split('?')[0], gc = true } = {}) => {
-  conn.binaryType = 'arraybuffer'
-  // get doc, initialize if it does not exist yet
-  const doc = getYDoc(docName, gc)
-  doc.conns.set(conn, new Set())
-  // listen and reply to events
-  conn.on('message', /** @param {ArrayBuffer} message */ message => messageListener(conn, doc, message))
-
-  // Check if connection is still alive
-  let pongReceived = true
-  const pingInterval = setInterval(() => {
-    if (!pongReceived) {
-      if (doc.conns.has(conn)) {
-        closeConn(doc, conn)
-      }
-      clearInterval(pingInterval)
-    } else if (doc.conns.has(conn)) {
-      pongReceived = false
-      try {
-        conn.ping()
-      } catch (e) {
-        closeConn(doc, conn)
-        clearInterval(pingInterval)
-      }
-    }
-  }, pingTimeout)
-  conn.on('close', () => {
-    closeConn(doc, conn)
-    clearInterval(pingInterval)
-  })
-  conn.on('pong', () => {
-    pongReceived = true
-  })
-  // put the following in a variables in a block so the interval handlers don't keep in in
-  // scope
-  {
-    // send sync step 1
-    const encoder = encoding.createEncoder()
-    encoding.writeVarUint(encoder, messageSync)
-    syncProtocol.writeSyncStep1(encoder, doc)
-    send(doc, conn, encoding.toUint8Array(encoder))
-    const awarenessStates = doc.awareness.getStates()
-    if (awarenessStates.size > 0) {
-      const encoder = encoding.createEncoder()
-      encoding.writeVarUint(encoder, messageAwareness)
-      encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(doc.awareness, Array.from(awarenessStates.keys())))
-      send(doc, conn, encoding.toUint8Array(encoder))
-    }
-  }
-}

vite.config.js

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import wasm from 'vite-plugin-wasm'
+import topLevelAwait from 'vite-plugin-top-level-await'
+
+export default defineConfig({
+  plugins: [wasm(), topLevelAwait()]
+})