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Author SHA1 Message Date
Patrick Charrier
a621cc4483 Implement P2P polling app with Yjs and WebRTC
Uses Yjs CRDTs for conflict-free shared state and y-webrtc for
peer-to-peer data exchange. Users can add poll options and vote/unvote,
with all changes syncing in real-time across connected peers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-15 04:32:06 +01:00
16 changed files with 447 additions and 1263 deletions

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node_modules
dist
.DS_Store

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# Minimal MVP Plan: P2P Poll App
## Recommendation
Build the MVP with:
- Vanilla JS or TypeScript
- Vite for local dev/build
- Yjs for shared state
- `y-webrtc` for browser-to-browser sync
- `y-indexeddb` for local persistence/offline recovery
This is the best fit for a small poll app because the data model is tiny, concurrent edits are possible, and Yjs already solves merge/conflict handling while `y-webrtc` gives a direct P2P transport with only signaling infrastructure.
## Why This Stack
### Recommended: Yjs + y-webrtc
- Best balance of simplicity and correctness
- Clients connect directly over WebRTC
- No custom conflict-resolution logic needed
- Easy to add offline persistence
- Good fit for a single shared document/room
### Not recommended for the first MVP
#### PeerJS
- Very simple transport layer
- But you must design and maintain your own replication and merge rules
- Fine for demos with a host-authoritative peer, weaker for true collaborative editing
#### GUN
- Fast to prototype realtime shared state
- But official tutorials commonly use a GUN peer/relay server for shared data
- For this app, its data model is less explicit than a CRDT and gives less control over vote semantics
#### Automerge
- Very capable CRDT and local-first model
- But heavier than needed for a single small poll
- Better choice if the project is expected to evolve into a richer collaborative app
## MVP Scope
Ship exactly one shared poll per room.
Included:
- Join a poll by opening a shared URL
- Add a new option
- Vote for one option
- Change your vote
- Realtime updates across peers
- Local persistence in the browser
- Basic connection status UI
Excluded:
- User accounts
- Multiple polls per room
- Option deletion/editing
- Authentication/authorization
- Rich presence
- Advanced discovery
- Production-grade TURN/signaling deployment
## MVP UX
Keep the interface intentionally small:
- Poll title at the top
- Option list with vote counts
- One button per option to cast vote
- Small form to add an option
- Status line showing `connecting`, `connected`, or `offline`
- Small label showing which option you voted for
Join model:
- Room ID in the URL, e.g. `/?room=poll-demo`
- Users share the URL manually
Identity model:
- Generate a local `userId` once and store it in `localStorage`
- Optional local display name, also stored locally
## Shared Data Model
Use a single Yjs document per room.
Suggested structure:
- `poll` as a `Y.Map`
- `poll.title` as a string
- `poll.options` as a `Y.Map<optionId, Y.Map>`
- `poll.votes` as a `Y.Map<userId, optionId>`
Each option record:
- `id`
- `label`
- `createdBy`
- `createdAt`
Important design choice:
Do not store vote counters as mutable shared numbers for the MVP.
Instead, derive counts from `votes`.
Why:
- A user changing vote becomes a single write: `votes[userId] = optionId`
- No double-counting logic
- Concurrent writes are easier to reason about
- Rendering counts from `votes` is trivial at this scale
## Sync Model
### Networking
- Use `WebrtcProvider(roomId, ydoc)`
- Start with the default public signaling servers for local development
- If needed, swap to a self-hosted signaling server later without changing the app model
### Persistence
- Use `IndexeddbPersistence(roomId, ydoc)`
- This preserves state across reloads and helps when reconnecting after temporary disconnects
### Conflict behavior
- Concurrent option additions merge naturally
- Concurrent vote changes resolve at the per-user key level
- Tally is recalculated from the merged vote map
## Suggested Project Structure
```text
src/
main.ts
app.ts
state.ts
sync.ts
render.ts
identity.ts
styles.css
index.html
```
Responsibilities:
- `sync.ts`: create Yjs doc, WebRTC provider, IndexedDB provider
- `state.ts`: shared structures, add option, cast vote, selectors
- `identity.ts`: local `userId` and optional name
- `render.ts`: DOM updates
- `app.ts`: wire events to state and rendering
## Implementation Plan
### Phase 1: App shell
- Create Vite app with vanilla TS or JS
- Add a minimal single-page UI
- Parse `room` from the URL
- Generate and persist `userId`
Success check:
- App loads
- Room ID appears in UI
- User can type in the form
### Phase 2: Shared state
- Add Yjs document
- Create root shared maps
- Seed default poll title if missing
- Observe document updates and re-render UI
Success check:
- State exists in one browser tab
- Refresh keeps local state when IndexedDB is enabled
### Phase 3: P2P sync
- Add `y-webrtc`
- Join room based on URL room ID
- Show connection status from provider events
Success check:
- Two browsers on different tabs/devices see the same options
- New options appear in near real time
### Phase 4: Voting logic
- Implement `castVote(optionId)` as `votes.set(userId, optionId)`
- Derive tallies from `votes`
- Highlight the local users current vote
Success check:
- Votes update live across peers
- Changing vote updates counts correctly
### Phase 5: Basic hardening
- Trim/validate option labels
- Prevent empty options
- Ignore duplicate labels case-insensitively for MVP
- Show simple offline/connecting text
Success check:
- Basic misuse does not break the UI
- Reconnect restores updates
## Minimal API Surface
These functions are enough for the first build:
- `getRoomId(): string`
- `getUserId(): string`
- `initSync(roomId): AppSync`
- `ensurePollInitialized()`
- `addOption(label: string)`
- `castVote(optionId: string)`
- `getViewModel(): PollViewModel`
- `render(viewModel)`
## Risks And MVP Mitigations
### NAT / WebRTC connectivity
Risk:
- Some peer pairs may fail to connect in restrictive networks
Mitigation:
- Accept this for MVP
- Keep signaling configurable
- Add TURN only if testing shows frequent failures
### Small public signaling dependency
Risk:
- Public signaling is fine for demos, not ideal for production
Mitigation:
- Treat it as replaceable infrastructure
- Self-host later if the prototype is kept
### Duplicate or messy options
Risk:
- Users may add near-duplicate entries
Mitigation:
- Normalize labels
- Prevent exact duplicates for MVP
### No trust/auth model
Risk:
- Any participant in the room can add options and vote
Mitigation:
- Accept for MVP
- Frame rooms as small trusted groups
## Estimated MVP Size
For one developer:
- Initial prototype: 0.5 to 1 day
- Polished MVP with basic resilience: 1 to 2 days
Rough code size:
- 250 to 500 lines plus styles
## Nice Next Steps After MVP
- Copy-link button
- Participant list / presence
- Vote limit modes: single-choice or multi-choice
- Option editing/deletion
- QR code for room join
- Self-hosted signaling server
- PWA packaging for better offline behavior
## Sources
- PeerJS getting started: https://peerjs.com/client/getting-started
- Yjs collaborative editor guide: https://docs.yjs.dev/getting-started/a-collaborative-editor
- Yjs offline support: https://docs.yjs.dev/getting-started/allowing-offline-editing
- y-webrtc README: https://github.com/yjs/y-webrtc
- GUN tutorial showing shared data via a GUN peer: https://gun.eco/converse
- Automerge network sync: https://automerge.org/docs/tutorial/network-sync/

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# P2P Poll App
Small peer-to-peer polling app built with `Vite`, `TypeScript`, `Yjs`, `y-webrtc`, and `y-indexeddb`.
## Features
- single shared poll per room
- add options collaboratively
- one vote per user, changeable at any time
- peer-to-peer sync over WebRTC
- local browser persistence for refresh/reconnect recovery
- shareable room URL
## Run locally
```bash
npm install
npm run dev
```
Open the local URL in two tabs or browsers and use the same `?room=` query string to join the same poll.
Example:
```text
http://localhost:5173/?room=poll-demo
```
## Build
```bash
npm run build
```
## Notes
- The app uses public signaling through `y-webrtc` for MVP simplicity.
- Poll state is not stored on an application server.
- WebRTC connectivity can still depend on the network environment of the participating peers.
# P2P Poll App

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<!doctype html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>P2P Poll</title>
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/main.ts"></script>
</body>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>P2P Poll</title>
<link rel="stylesheet" href="/src/style.css">
</head>
<body>
<div id="app">
<header>
<h1>P2P Poll</h1>
<div id="status">
<span id="connection-status" class="connecting">Connecting...</span>
<span id="peer-count">1 peer</span>
</div>
</header>
<main>
<div id="add-option">
<input type="text" id="option-input" placeholder="Add a poll option..." maxlength="100">
<button id="add-btn">Add</button>
</div>
<div id="poll-options"></div>
<p id="empty-state">No options yet. Add one above!</p>
</main>
</div>
<script type="module" src="/src/main.js"></script>
</body>
</html>

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"cpu": [
"x64"
],
@@ -307,9 +305,9 @@
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},
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"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.27.4.tgz",
"integrity": "sha512-xHT8X4sb0GS8qTqiwzHqpY00C95DPAq7nAwX35Ie/s+LO9830hrMd3oX0ZMKLvy7vsonee73x0lmcdOVXFzd6Q==",
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"cpu": [
"arm64"
],
@@ -324,9 +322,9 @@
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"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.27.4.tgz",
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"cpu": [
"x64"
],
@@ -341,9 +339,9 @@
}
},
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"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.27.4.tgz",
"integrity": "sha512-2MyL3IAaTX+1/qP0O1SwskwcwCoOI4kV2IBX1xYnDDqthmq5ArrW94qSIKCAuRraMgPOmG0RDTA74mzYNQA9ow==",
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"resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.25.12.tgz",
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"cpu": [
"arm64"
],
@@ -358,9 +356,9 @@
}
},
"node_modules/@esbuild/openbsd-x64": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.27.4.tgz",
"integrity": "sha512-u8fg/jQ5aQDfsnIV6+KwLOf1CmJnfu1ShpwqdwC0uA7ZPwFws55Ngc12vBdeUdnuWoQYx/SOQLGDcdlfXhYmXQ==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.25.12.tgz",
"integrity": "sha512-MZyXUkZHjQxUvzK7rN8DJ3SRmrVrke8ZyRusHlP+kuwqTcfWLyqMOE3sScPPyeIXN/mDJIfGXvcMqCgYKekoQw==",
"cpu": [
"x64"
],
@@ -375,9 +373,9 @@
}
},
"node_modules/@esbuild/openharmony-arm64": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.27.4.tgz",
"integrity": "sha512-JkTZrl6VbyO8lDQO3yv26nNr2RM2yZzNrNHEsj9bm6dOwwu9OYN28CjzZkH57bh4w0I2F7IodpQvUAEd1mbWXg==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.25.12.tgz",
"integrity": "sha512-rm0YWsqUSRrjncSXGA7Zv78Nbnw4XL6/dzr20cyrQf7ZmRcsovpcRBdhD43Nuk3y7XIoW2OxMVvwuRvk9XdASg==",
"cpu": [
"arm64"
],
@@ -392,9 +390,9 @@
}
},
"node_modules/@esbuild/sunos-x64": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.27.4.tgz",
"integrity": "sha512-/gOzgaewZJfeJTlsWhvUEmUG4tWEY2Spp5M20INYRg2ZKl9QPO3QEEgPeRtLjEWSW8FilRNacPOg8R1uaYkA6g==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.25.12.tgz",
"integrity": "sha512-3wGSCDyuTHQUzt0nV7bocDy72r2lI33QL3gkDNGkod22EsYl04sMf0qLb8luNKTOmgF/eDEDP5BFNwoBKH441w==",
"cpu": [
"x64"
],
@@ -409,9 +407,9 @@
}
},
"node_modules/@esbuild/win32-arm64": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.27.4.tgz",
"integrity": "sha512-Z9SExBg2y32smoDQdf1HRwHRt6vAHLXcxD2uGgO/v2jK7Y718Ix4ndsbNMU/+1Qiem9OiOdaqitioZwxivhXYg==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.25.12.tgz",
"integrity": "sha512-rMmLrur64A7+DKlnSuwqUdRKyd3UE7oPJZmnljqEptesKM8wx9J8gx5u0+9Pq0fQQW8vqeKebwNXdfOyP+8Bsg==",
"cpu": [
"arm64"
],
@@ -426,9 +424,9 @@
}
},
"node_modules/@esbuild/win32-ia32": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.27.4.tgz",
"integrity": "sha512-DAyGLS0Jz5G5iixEbMHi5KdiApqHBWMGzTtMiJ72ZOLhbu/bzxgAe8Ue8CTS3n3HbIUHQz/L51yMdGMeoxXNJw==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.25.12.tgz",
"integrity": "sha512-HkqnmmBoCbCwxUKKNPBixiWDGCpQGVsrQfJoVGYLPT41XWF8lHuE5N6WhVia2n4o5QK5M4tYr21827fNhi4byQ==",
"cpu": [
"ia32"
],
@@ -443,9 +441,9 @@
}
},
"node_modules/@esbuild/win32-x64": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.27.4.tgz",
"integrity": "sha512-+knoa0BDoeXgkNvvV1vvbZX4+hizelrkwmGJBdT17t8FNPwG2lKemmuMZlmaNQ3ws3DKKCxpb4zRZEIp3UxFCg==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.25.12.tgz",
"integrity": "sha512-alJC0uCZpTFrSL0CCDjcgleBXPnCrEAhTBILpeAp7M/OFgoqtAetfBzX0xM00MUsVVPpVjlPuMbREqnZCXaTnA==",
"cpu": [
"x64"
],
@@ -884,9 +882,9 @@
"license": "MIT"
},
"node_modules/esbuild": {
"version": "0.27.4",
"resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.27.4.tgz",
"integrity": "sha512-Rq4vbHnYkK5fws5NF7MYTU68FPRE1ajX7heQ/8QXXWqNgqqJ/GkmmyxIzUnf2Sr/bakf8l54716CcMGHYhMrrQ==",
"version": "0.25.12",
"resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.12.tgz",
"integrity": "sha512-bbPBYYrtZbkt6Os6FiTLCTFxvq4tt3JKall1vRwshA3fdVztsLAatFaZobhkBC8/BrPetoa0oksYoKXoG4ryJg==",
"dev": true,
"hasInstallScript": true,
"license": "MIT",
@@ -897,32 +895,32 @@
"node": ">=18"
},
"optionalDependencies": {
"@esbuild/aix-ppc64": "0.27.4",
"@esbuild/android-arm": "0.27.4",
"@esbuild/android-arm64": "0.27.4",
"@esbuild/android-x64": "0.27.4",
"@esbuild/darwin-arm64": "0.27.4",
"@esbuild/darwin-x64": "0.27.4",
"@esbuild/freebsd-arm64": "0.27.4",
"@esbuild/freebsd-x64": "0.27.4",
"@esbuild/linux-arm": "0.27.4",
"@esbuild/linux-arm64": "0.27.4",
"@esbuild/linux-ia32": "0.27.4",
"@esbuild/linux-loong64": "0.27.4",
"@esbuild/linux-mips64el": "0.27.4",
"@esbuild/linux-ppc64": "0.27.4",
"@esbuild/linux-riscv64": "0.27.4",
"@esbuild/linux-s390x": "0.27.4",
"@esbuild/linux-x64": "0.27.4",
"@esbuild/netbsd-arm64": "0.27.4",
"@esbuild/netbsd-x64": "0.27.4",
"@esbuild/openbsd-arm64": "0.27.4",
"@esbuild/openbsd-x64": "0.27.4",
"@esbuild/openharmony-arm64": "0.27.4",
"@esbuild/sunos-x64": "0.27.4",
"@esbuild/win32-arm64": "0.27.4",
"@esbuild/win32-ia32": "0.27.4",
"@esbuild/win32-x64": "0.27.4"
"@esbuild/aix-ppc64": "0.25.12",
"@esbuild/android-arm": "0.25.12",
"@esbuild/android-arm64": "0.25.12",
"@esbuild/android-x64": "0.25.12",
"@esbuild/darwin-arm64": "0.25.12",
"@esbuild/darwin-x64": "0.25.12",
"@esbuild/freebsd-arm64": "0.25.12",
"@esbuild/freebsd-x64": "0.25.12",
"@esbuild/linux-arm": "0.25.12",
"@esbuild/linux-arm64": "0.25.12",
"@esbuild/linux-ia32": "0.25.12",
"@esbuild/linux-loong64": "0.25.12",
"@esbuild/linux-mips64el": "0.25.12",
"@esbuild/linux-ppc64": "0.25.12",
"@esbuild/linux-riscv64": "0.25.12",
"@esbuild/linux-s390x": "0.25.12",
"@esbuild/linux-x64": "0.25.12",
"@esbuild/netbsd-arm64": "0.25.12",
"@esbuild/netbsd-x64": "0.25.12",
"@esbuild/openbsd-arm64": "0.25.12",
"@esbuild/openbsd-x64": "0.25.12",
"@esbuild/openharmony-arm64": "0.25.12",
"@esbuild/sunos-x64": "0.25.12",
"@esbuild/win32-arm64": "0.25.12",
"@esbuild/win32-ia32": "0.25.12",
"@esbuild/win32-x64": "0.25.12"
}
},
"node_modules/fdir": {
@@ -1268,20 +1266,6 @@
"url": "https://github.com/sponsors/SuperchupuDev"
}
},
"node_modules/typescript": {
"version": "5.9.3",
"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
"integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
"dev": true,
"license": "Apache-2.0",
"bin": {
"tsc": "bin/tsc",
"tsserver": "bin/tsserver"
},
"engines": {
"node": ">=14.17"
}
},
"node_modules/util-deprecate": {
"version": "1.0.2",
"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -1289,24 +1273,24 @@
"license": "MIT"
},
"node_modules/vite": {
"version": "7.3.1",
"resolved": "https://registry.npmjs.org/vite/-/vite-7.3.1.tgz",
"integrity": "sha512-w+N7Hifpc3gRjZ63vYBXA56dvvRlNWRczTdmCBBa+CotUzAPf5b7YMdMR/8CQoeYE5LX3W4wj6RYTgonm1b9DA==",
"version": "6.4.1",
"resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
"integrity": "sha512-+Oxm7q9hDoLMyJOYfUYBuHQo+dkAloi33apOPP56pzj+vsdJDzr+j1NISE5pyaAuKL4A3UD34qd0lx5+kfKp2g==",
"dev": true,
"license": "MIT",
"dependencies": {
"esbuild": "^0.27.0",
"fdir": "^6.5.0",
"picomatch": "^4.0.3",
"postcss": "^8.5.6",
"rollup": "^4.43.0",
"tinyglobby": "^0.2.15"
"esbuild": "^0.25.0",
"fdir": "^6.4.4",
"picomatch": "^4.0.2",
"postcss": "^8.5.3",
"rollup": "^4.34.9",
"tinyglobby": "^0.2.13"
},
"bin": {
"vite": "bin/vite.js"
},
"engines": {
"node": "^20.19.0 || >=22.12.0"
"node": "^18.0.0 || ^20.0.0 || >=22.0.0"
},
"funding": {
"url": "https://github.com/vitejs/vite?sponsor=1"
@@ -1315,14 +1299,14 @@
"fsevents": "~2.3.3"
},
"peerDependencies": {
"@types/node": "^20.19.0 || >=22.12.0",
"@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
"jiti": ">=1.21.0",
"less": "^4.0.0",
"less": "*",
"lightningcss": "^1.21.0",
"sass": "^1.70.0",
"sass-embedded": "^1.70.0",
"stylus": ">=0.54.8",
"sugarss": "^5.0.0",
"sass": "*",
"sass-embedded": "*",
"stylus": "*",
"sugarss": "*",
"terser": "^5.16.0",
"tsx": "^4.8.1",
"yaml": "^2.4.2"
@@ -1385,26 +1369,6 @@
}
}
},
"node_modules/y-indexeddb": {
"version": "9.0.12",
"resolved": "https://registry.npmjs.org/y-indexeddb/-/y-indexeddb-9.0.12.tgz",
"integrity": "sha512-9oCFRSPPzBK7/w5vOkJBaVCQZKHXB/v6SIT+WYhnJxlEC61juqG0hBrAf+y3gmSMLFLwICNH9nQ53uscuse6Hg==",
"license": "MIT",
"dependencies": {
"lib0": "^0.2.74"
},
"engines": {
"node": ">=16.0.0",
"npm": ">=8.0.0"
},
"funding": {
"type": "GitHub Sponsors ❤",
"url": "https://github.com/sponsors/dmonad"
},
"peerDependencies": {
"yjs": "^13.0.0"
}
},
"node_modules/y-protocols": {
"version": "1.0.7",
"resolved": "https://registry.npmjs.org/y-protocols/-/y-protocols-1.0.7.tgz",

View File

@@ -1,20 +1,18 @@
{
"name": "p2p-poll-app",
"version": "0.1.0",
"name": "p2p-poll",
"private": true,
"version": "1.0.0",
"type": "module",
"scripts": {
"dev": "vite",
"build": "tsc --noEmit && vite build",
"build": "vite build",
"preview": "vite preview"
},
"dependencies": {
"y-indexeddb": "^9.0.12",
"y-webrtc": "^10.3.0",
"yjs": "^13.6.27"
"yjs": "^13.6.0",
"y-webrtc": "^10.3.0"
},
"devDependencies": {
"typescript": "^5.9.2",
"vite": "^7.1.5"
"vite": "^6.0.0"
}
}

View File

@@ -1,107 +0,0 @@
import { getUserId } from "./identity";
import { renderApp } from "./render";
import { addOption, castVote, createViewModel } from "./state";
import { initSync } from "./sync";
const ROOM_PARAM = "room";
function createRoomId() {
const seed = typeof crypto.randomUUID === "function"
? crypto.randomUUID().slice(0, 8)
: Math.random().toString(36).slice(2, 10);
return `poll-${seed}`;
}
function ensureRoomId() {
const url = new URL(window.location.href);
let roomId = url.searchParams.get(ROOM_PARAM)?.trim();
if (!roomId) {
roomId = createRoomId();
url.searchParams.set(ROOM_PARAM, roomId);
window.history.replaceState({}, "", url);
}
return roomId;
}
export function initApp(container: HTMLElement) {
const roomId = ensureRoomId();
const userId = getUserId();
const sync = initSync(roomId);
let feedbackMessage = "Ready to collaborate.";
let feedbackTimer: number | undefined;
const setFeedbackMessage = (message: string) => {
feedbackMessage = message;
render();
if (feedbackTimer) {
window.clearTimeout(feedbackTimer);
}
feedbackTimer = window.setTimeout(() => {
feedbackMessage = "Ready to collaborate.";
render();
}, 2400);
};
const render = () => {
const viewModel = createViewModel({
meta: sync.meta,
options: sync.options,
votes: sync.votes,
roomId,
shareUrl: window.location.href,
connectionStatus: sync.getConnectionStatus(),
userId,
});
renderApp(container, viewModel, feedbackMessage, {
onSubmitOption: (label) => {
const result = addOption(sync.options, label, userId);
if (!result.ok) {
setFeedbackMessage(result.error);
return;
}
setFeedbackMessage("Option added and syncing.");
},
onVote: (optionId) => {
castVote(sync.votes, userId, optionId);
setFeedbackMessage("Vote updated.");
},
onCopyLink: async () => {
try {
await navigator.clipboard.writeText(window.location.href);
setFeedbackMessage("Room link copied.");
} catch {
setFeedbackMessage("Could not copy the link in this browser.");
}
},
});
};
const rerender = () => render();
const observe = () => rerender();
sync.doc.on("update", observe);
sync.persistence.once("synced", rerender);
sync.provider.on("status", rerender);
window.addEventListener("online", rerender);
window.addEventListener("offline", rerender);
render();
return () => {
if (feedbackTimer) {
window.clearTimeout(feedbackTimer);
}
sync.doc.off("update", observe);
sync.provider.off("status", rerender);
window.removeEventListener("online", rerender);
window.removeEventListener("offline", rerender);
sync.destroy();
};
}

View File

@@ -1,20 +0,0 @@
const USER_ID_KEY = "p2p-poll:user-id";
function createUserId() {
if (typeof crypto.randomUUID === "function") {
return crypto.randomUUID();
}
return `user-${Math.random().toString(36).slice(2, 10)}`;
}
export function getUserId() {
const existing = localStorage.getItem(USER_ID_KEY);
if (existing) {
return existing;
}
const next = createUserId();
localStorage.setItem(USER_ID_KEY, next);
return next;
}

136
src/main.js Normal file
View File

@@ -0,0 +1,136 @@
import * as Y from 'yjs';
import { WebrtcProvider } from 'y-webrtc';
// --- Peer ID (stable across reloads) ---
function getOrCreatePeerId() {
let id = localStorage.getItem('peer-id');
if (!id) {
id = crypto.randomUUID();
localStorage.setItem('peer-id', id);
}
return id;
}
const peerId = getOrCreatePeerId();
// --- Room name from URL ---
function getRoomName() {
const params = new URLSearchParams(window.location.search);
return params.get('room') || 'default-poll';
}
const roomName = getRoomName();
// --- Yjs setup ---
const ydoc = new Y.Doc();
const provider = new WebrtcProvider(roomName, ydoc);
const yOptions = ydoc.getMap('poll-options');
// --- Data operations ---
function addOption(name) {
const id = crypto.randomUUID();
const optionMap = new Y.Map();
optionMap.set('name', name);
optionMap.set('votes', new Y.Map());
yOptions.set(id, optionMap);
}
function toggleVote(optionId) {
const optionMap = yOptions.get(optionId);
if (!optionMap) return;
const votes = optionMap.get('votes');
if (votes.has(peerId)) {
votes.delete(peerId);
} else {
votes.set(peerId, true);
}
}
// --- UI rendering ---
const container = document.getElementById('poll-options');
const emptyState = document.getElementById('empty-state');
function render() {
container.innerHTML = '';
const entries = [];
yOptions.forEach((optionMap, id) => {
entries.push({
id,
name: optionMap.get('name'),
votes: optionMap.get('votes').size,
voted: optionMap.get('votes').has(peerId),
});
});
entries.sort((a, b) => b.votes - a.votes || a.name.localeCompare(b.name));
emptyState.className = entries.length > 0 ? 'hidden' : '';
for (const entry of entries) {
const div = document.createElement('div');
div.className = 'poll-option';
const nameSpan = document.createElement('span');
nameSpan.className = 'option-name';
nameSpan.textContent = entry.name;
const voteCount = document.createElement('span');
voteCount.className = 'vote-count';
voteCount.textContent = entry.votes;
const voteBtn = document.createElement('button');
voteBtn.className = entry.voted ? 'vote-btn voted' : 'vote-btn';
voteBtn.textContent = entry.voted ? 'Unvote' : 'Vote';
voteBtn.addEventListener('click', () => toggleVote(entry.id));
div.append(nameSpan, voteCount, voteBtn);
container.appendChild(div);
}
}
// Re-render on any change in the shared state
yOptions.observeDeep(() => render());
// --- Add option handlers ---
const input = document.getElementById('option-input');
const addBtn = document.getElementById('add-btn');
addBtn.addEventListener('click', () => {
const name = input.value.trim();
if (name) {
addOption(name);
input.value = '';
}
});
input.addEventListener('keydown', (e) => {
if (e.key === 'Enter') addBtn.click();
});
// --- Connection status & peer count ---
const statusEl = document.getElementById('connection-status');
const peerCountEl = document.getElementById('peer-count');
provider.on('synced', ({ synced }) => {
statusEl.textContent = synced ? 'Connected' : 'Connecting...';
statusEl.className = synced ? 'connected' : 'connecting';
});
function updatePeerCount() {
const count = provider.awareness.getStates().size;
peerCountEl.textContent = `${count} peer${count !== 1 ? 's' : ''}`;
}
provider.awareness.on('change', updatePeerCount);
updatePeerCount();
// --- Initial render ---
render();

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@@ -1,11 +0,0 @@
import "./styles.css";
import { initApp } from "./app";
const container = document.querySelector<HTMLElement>("#app");
if (!container) {
throw new Error("App container not found.");
}
initApp(container);

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@@ -1,131 +0,0 @@
import type { PollViewModel } from "./state";
interface RenderActions {
onSubmitOption: (label: string) => void;
onVote: (optionId: string) => void;
onCopyLink: () => void;
}
function escapeHtml(value: string) {
return value
.replaceAll("&", "&amp;")
.replaceAll("<", "&lt;")
.replaceAll(">", "&gt;")
.replaceAll('"', "&quot;")
.replaceAll("'", "&#39;");
}
export function renderApp(
container: HTMLElement,
viewModel: PollViewModel,
feedbackMessage: string,
actions: RenderActions,
) {
const optionMarkup = viewModel.options.length
? viewModel.options
.map((option) => {
const buttonLabel = option.isSelectedByMe ? "Selected" : "Vote";
const selectedClass = option.isSelectedByMe ? "option-card selected" : "option-card";
return `
<li class="${selectedClass}">
<div class="option-main">
<div>
<p class="option-label">${escapeHtml(option.label)}</p>
<p class="option-meta">${option.voteCount} vote${option.voteCount === 1 ? "" : "s"}</p>
</div>
<button class="vote-button" data-option-id="${option.id}">
${buttonLabel}
</button>
</div>
</li>
`;
})
.join("")
: `
<li class="empty-state">
No options yet. Add the first one and it will sync to everyone in this room.
</li>
`;
const statusClass = `status-pill ${viewModel.connectionStatus}`;
const myVoteLabel = viewModel.myVoteOptionId
? "Your vote is currently synced."
: "You have not voted yet.";
container.innerHTML = `
<main class="shell">
<section class="hero">
<div class="hero-copy">
<p class="eyebrow">Peer-to-peer room</p>
<h1>${escapeHtml(viewModel.title)}</h1>
<p class="hero-text">
Share the room link, add options, and vote live without a central app server storing poll state.
</p>
</div>
<div class="hero-meta">
<span class="${statusClass}">${viewModel.connectionStatus}</span>
<p class="room-label">Room: <code>${escapeHtml(viewModel.roomId)}</code></p>
</div>
</section>
<section class="panel share-panel">
<label class="field-label" for="share-url">Share this room</label>
<div class="share-row">
<input id="share-url" class="share-input" type="text" readonly value="${escapeHtml(viewModel.shareUrl)}" />
<button id="copy-link-button" class="secondary-button" type="button">Copy link</button>
</div>
</section>
<section class="panel">
<div class="section-header">
<div>
<h2>Options</h2>
<p>${myVoteLabel}</p>
</div>
</div>
<ul class="options-list">${optionMarkup}</ul>
</section>
<section class="panel">
<h2>Add an option</h2>
<form id="add-option-form" class="option-form">
<input
id="option-input"
name="option"
type="text"
maxlength="80"
placeholder="Add an option"
autocomplete="off"
required
/>
<button class="primary-button" type="submit">Add option</button>
</form>
<p class="feedback" aria-live="polite">${escapeHtml(feedbackMessage)}</p>
</section>
</main>
`;
const addOptionForm = container.querySelector<HTMLFormElement>("#add-option-form");
const optionInput = container.querySelector<HTMLInputElement>("#option-input");
const copyLinkButton = container.querySelector<HTMLButtonElement>("#copy-link-button");
addOptionForm?.addEventListener("submit", (event) => {
event.preventDefault();
const label = optionInput?.value ?? "";
actions.onSubmitOption(label);
});
copyLinkButton?.addEventListener("click", () => {
actions.onCopyLink();
});
container.querySelectorAll<HTMLButtonElement>("[data-option-id]").forEach((button) => {
button.addEventListener("click", () => {
const optionId = button.dataset.optionId;
if (optionId) {
actions.onVote(optionId);
}
});
});
}

View File

@@ -1,124 +0,0 @@
import * as Y from "yjs";
export const DEFAULT_POLL_TITLE = "Shared Poll";
export type ConnectionStatus = "connecting" | "connected" | "offline";
export interface OptionRecord {
id: string;
label: string;
createdAt: number;
createdBy: string;
}
export interface PollOptionViewModel extends OptionRecord {
voteCount: number;
isSelectedByMe: boolean;
}
export interface PollViewModel {
title: string;
roomId: string;
shareUrl: string;
connectionStatus: ConnectionStatus;
options: PollOptionViewModel[];
myVoteOptionId: string | null;
}
const META_KEY_TITLE = "title";
function createOptionId() {
if (typeof crypto.randomUUID === "function") {
return crypto.randomUUID();
}
return `option-${Math.random().toString(36).slice(2, 10)}`;
}
function normalizeLabel(label: string) {
return label.trim().replace(/\s+/g, " ");
}
function getPollTitle(meta: Y.Map<string>) {
return meta.get(META_KEY_TITLE) ?? DEFAULT_POLL_TITLE;
}
export function ensurePollInitialized(meta: Y.Map<string>) {
if (!meta.has(META_KEY_TITLE)) {
meta.set(META_KEY_TITLE, DEFAULT_POLL_TITLE);
}
}
export function addOption(
options: Y.Map<OptionRecord>,
rawLabel: string,
userId: string,
) {
const label = normalizeLabel(rawLabel);
if (!label) {
return { ok: false as const, error: "Option label cannot be empty." };
}
const normalizedTarget = label.toLocaleLowerCase();
const duplicate = Array.from(options.values()).some(
(option) => option.label.trim().toLocaleLowerCase() === normalizedTarget,
);
if (duplicate) {
return { ok: false as const, error: "That option already exists." };
}
const option: OptionRecord = {
id: createOptionId(),
label,
createdAt: Date.now(),
createdBy: userId,
};
options.set(option.id, option);
return { ok: true as const, optionId: option.id };
}
export function castVote(votes: Y.Map<string>, userId: string, optionId: string) {
votes.set(userId, optionId);
}
export function createViewModel(params: {
meta: Y.Map<string>;
options: Y.Map<OptionRecord>;
votes: Y.Map<string>;
roomId: string;
shareUrl: string;
connectionStatus: ConnectionStatus;
userId: string;
}): PollViewModel {
const { meta, options, votes, roomId, shareUrl, connectionStatus, userId } =
params;
const tally = new Map<string, number>();
for (const optionId of votes.values()) {
tally.set(optionId, (tally.get(optionId) ?? 0) + 1);
}
const myVoteOptionId = votes.get(userId) ?? null;
const sortedOptions = Array.from(options.values()).sort((left, right) => {
if (left.createdAt !== right.createdAt) {
return left.createdAt - right.createdAt;
}
return left.label.localeCompare(right.label);
});
return {
title: getPollTitle(meta),
roomId,
shareUrl,
connectionStatus,
myVoteOptionId,
options: sortedOptions.map((option) => ({
...option,
voteCount: tally.get(option.id) ?? 0,
isSelectedByMe: myVoteOptionId === option.id,
})),
};
}

144
src/style.css Normal file
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@@ -0,0 +1,144 @@
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
background: #f5f5f5;
color: #333;
min-height: 100vh;
}
#app {
max-width: 600px;
margin: 0 auto;
padding: 2rem 1rem;
}
header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 2rem;
}
h1 {
font-size: 1.5rem;
}
#status {
display: flex;
gap: 1rem;
font-size: 0.85rem;
color: #666;
}
#connection-status::before {
content: "";
display: inline-block;
width: 8px;
height: 8px;
border-radius: 50%;
margin-right: 4px;
vertical-align: middle;
}
#connection-status.connected::before {
background: #4caf50;
}
#connection-status.connecting::before {
background: #ff9800;
}
#add-option {
display: flex;
gap: 0.5rem;
margin-bottom: 1.5rem;
}
#option-input {
flex: 1;
padding: 0.6rem 0.8rem;
border: 1px solid #ddd;
border-radius: 6px;
font-size: 1rem;
outline: none;
}
#option-input:focus {
border-color: #2196f3;
}
#add-btn {
padding: 0.6rem 1.2rem;
background: #2196f3;
color: white;
border: none;
border-radius: 6px;
font-size: 1rem;
cursor: pointer;
}
#add-btn:hover {
background: #1976d2;
}
.poll-option {
display: flex;
align-items: center;
background: white;
padding: 0.8rem 1rem;
border-radius: 8px;
margin-bottom: 0.5rem;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}
.option-name {
flex: 1;
font-size: 1rem;
}
.vote-count {
font-size: 0.9rem;
font-weight: 600;
color: #666;
margin-right: 0.75rem;
min-width: 1.5rem;
text-align: center;
}
.vote-btn {
padding: 0.4rem 1rem;
border: 2px solid #2196f3;
border-radius: 6px;
font-size: 0.85rem;
cursor: pointer;
background: white;
color: #2196f3;
}
.vote-btn:hover {
background: #e3f2fd;
}
.vote-btn.voted {
background: #2196f3;
color: white;
}
.vote-btn.voted:hover {
background: #1976d2;
}
#empty-state {
text-align: center;
color: #999;
padding: 2rem;
}
#empty-state.hidden {
display: none;
}

View File

@@ -1,256 +0,0 @@
:root {
font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
color: #132238;
background:
radial-gradient(circle at top left, rgba(255, 190, 120, 0.55), transparent 28%),
radial-gradient(circle at top right, rgba(86, 201, 166, 0.3), transparent 24%),
linear-gradient(180deg, #f9f4e8 0%, #f4efe6 48%, #ece5d8 100%);
line-height: 1.5;
font-weight: 400;
color-scheme: light;
}
* {
box-sizing: border-box;
}
body {
margin: 0;
min-height: 100vh;
}
button,
input {
font: inherit;
}
button {
cursor: pointer;
}
#app {
min-height: 100vh;
}
.shell {
width: min(920px, calc(100% - 2rem));
margin: 0 auto;
padding: 2rem 0 3rem;
}
.hero {
display: flex;
justify-content: space-between;
gap: 1.5rem;
align-items: flex-start;
margin-bottom: 1.5rem;
}
.hero-copy h1 {
margin: 0.15rem 0 0.5rem;
font-size: clamp(2.4rem, 6vw, 4rem);
line-height: 0.95;
letter-spacing: -0.05em;
}
.hero-text,
.section-header p,
.feedback,
.option-meta,
.room-label {
color: #4a5a6a;
}
.eyebrow {
margin: 0;
text-transform: uppercase;
letter-spacing: 0.16em;
font-size: 0.8rem;
color: #915f00;
}
.hero-meta {
min-width: 15rem;
padding: 1rem 1.1rem;
border-radius: 1.2rem;
background: rgba(255, 255, 255, 0.68);
border: 1px solid rgba(19, 34, 56, 0.08);
backdrop-filter: blur(10px);
}
.status-pill {
display: inline-flex;
align-items: center;
padding: 0.35rem 0.75rem;
border-radius: 999px;
font-weight: 700;
text-transform: capitalize;
font-size: 0.9rem;
}
.status-pill.connected {
background: rgba(86, 201, 166, 0.18);
color: #135d43;
}
.status-pill.connecting {
background: rgba(255, 190, 120, 0.22);
color: #8c5300;
}
.status-pill.offline {
background: rgba(219, 82, 82, 0.16);
color: #8f1f1f;
}
.panel {
margin-bottom: 1.25rem;
padding: 1.25rem;
border-radius: 1.3rem;
background: rgba(255, 255, 255, 0.78);
border: 1px solid rgba(19, 34, 56, 0.08);
box-shadow: 0 14px 40px rgba(19, 34, 56, 0.08);
backdrop-filter: blur(10px);
}
.panel h2 {
margin: 0 0 0.45rem;
font-size: 1.1rem;
}
.share-row,
.option-form,
.option-main {
display: flex;
gap: 0.75rem;
}
.field-label {
display: block;
margin-bottom: 0.6rem;
font-weight: 700;
}
.share-input,
.option-form input {
width: 100%;
min-width: 0;
border-radius: 0.95rem;
border: 1px solid rgba(19, 34, 56, 0.14);
background: rgba(255, 255, 255, 0.94);
padding: 0.85rem 1rem;
color: #132238;
}
.share-input:focus,
.option-form input:focus {
outline: 2px solid rgba(255, 190, 120, 0.65);
outline-offset: 1px;
}
.primary-button,
.secondary-button,
.vote-button {
border: none;
border-radius: 0.95rem;
padding: 0.85rem 1rem;
font-weight: 700;
transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}
.primary-button,
.vote-button {
background: #132238;
color: #f9f4e8;
box-shadow: 0 10px 20px rgba(19, 34, 56, 0.14);
}
.secondary-button {
background: rgba(19, 34, 56, 0.08);
color: #132238;
}
.primary-button:hover,
.secondary-button:hover,
.vote-button:hover {
transform: translateY(-1px);
}
.options-list {
list-style: none;
margin: 1rem 0 0;
padding: 0;
display: grid;
gap: 0.75rem;
}
.option-card,
.empty-state {
border-radius: 1.1rem;
padding: 1rem;
background: rgba(247, 244, 236, 0.95);
border: 1px solid rgba(19, 34, 56, 0.08);
}
.option-card.selected {
border-color: rgba(86, 201, 166, 0.85);
background: rgba(232, 249, 242, 0.95);
}
.option-main {
align-items: center;
justify-content: space-between;
}
.option-label {
margin: 0;
font-size: 1.05rem;
font-weight: 700;
}
.option-meta,
.feedback,
.room-label {
margin: 0.35rem 0 0;
}
.section-header {
display: flex;
justify-content: space-between;
align-items: baseline;
gap: 1rem;
}
.feedback {
min-height: 1.5rem;
}
code {
font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
}
@media (max-width: 720px) {
.shell {
width: min(100% - 1rem, 920px);
padding-top: 1rem;
}
.hero,
.share-row,
.option-form,
.option-main,
.section-header {
flex-direction: column;
}
.hero-meta {
width: 100%;
min-width: 0;
}
.primary-button,
.secondary-button,
.vote-button {
width: 100%;
}
}

View File

@@ -1,64 +0,0 @@
import { IndexeddbPersistence } from "y-indexeddb";
import { WebrtcProvider } from "y-webrtc";
import * as Y from "yjs";
import { type ConnectionStatus, ensurePollInitialized, type OptionRecord } from "./state";
export interface AppSync {
doc: Y.Doc;
meta: Y.Map<string>;
options: Y.Map<OptionRecord>;
votes: Y.Map<string>;
provider: WebrtcProvider;
persistence: IndexeddbPersistence;
getConnectionStatus: () => ConnectionStatus;
destroy: () => void;
}
export function initSync(roomId: string): AppSync {
const doc = new Y.Doc();
const meta = doc.getMap<string>("poll-meta");
const options = doc.getMap<OptionRecord>("poll-options");
const votes = doc.getMap<string>("poll-votes");
ensurePollInitialized(meta);
let connectionStatus: ConnectionStatus = navigator.onLine ? "connecting" : "offline";
const provider = new WebrtcProvider(roomId, doc);
const persistence = new IndexeddbPersistence(roomId, doc);
const syncConnectionStatus = (status: ConnectionStatus) => {
connectionStatus = navigator.onLine ? status : "offline";
};
const handleOnline = () => {
syncConnectionStatus(provider.connected ? "connected" : "connecting");
};
const handleOffline = () => {
connectionStatus = "offline";
};
provider.on("status", (event: { connected: boolean }) => {
syncConnectionStatus(event.connected ? "connected" : "connecting");
});
window.addEventListener("online", handleOnline);
window.addEventListener("offline", handleOffline);
return {
doc,
meta,
options,
votes,
provider,
persistence,
getConnectionStatus: () => connectionStatus,
destroy: () => {
window.removeEventListener("online", handleOnline);
window.removeEventListener("offline", handleOffline);
persistence.destroy();
provider.destroy();
doc.destroy();
},
};
}

View File

@@ -1,15 +0,0 @@
{
"compilerOptions": {
"target": "ES2022",
"module": "ESNext",
"moduleResolution": "Bundler",
"lib": ["DOM", "DOM.Iterable", "ES2022"],
"strict": true,
"noEmit": true,
"esModuleInterop": true,
"skipLibCheck": true,
"allowSyntheticDefaultImports": true,
"useDefineForClassFields": true
},
"include": ["src"]
}