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Backend Functions

These serverless functions broadcast quiz events via AnyCable. Copy the folder for your platform into your project.

Environment Variables

Variable Description
ANYCABLE_BROADCAST_URL AnyCable HTTP broadcast endpoint (from AnyCable Plus dashboard)

Never put this in your code. Set it in your platform's dashboard.

Netlify

  1. Copy functions/netlify/*.mts (not package.json) to netlify/functions/ in your project
  2. Add the runtime dependencies to your project: npm install @anycable/serverless-js valibot
  3. Set env vars in Netlify dashboard > Site settings > Environment variables
  4. Deploy — endpoints are /.netlify/functions/quiz-answer and /.netlify/functions/quiz-sync (the defaults)

Vercel

  1. Copy functions/vercel/*.ts (not package.json) to api/ in your project
  2. Add the runtime dependencies to your project: npm install @anycable/serverless-js valibot
  3. Set env vars in Vercel dashboard > Settings > Environment Variables
  4. For Slidev, add a vercel.json with {"buildCommand": "npx slidev build", "outputDirectory": "dist"}
  5. Deploy — endpoints are /api/quiz-answer and /api/quiz-sync
  6. Configure the plugin to use Vercel endpoints:
slideQuiz: {
  endpoints: {
    answer: '/api/quiz-answer',
    sync: '/api/quiz-sync',
  }
}

Verifying a deploy

npx -p create-slide-quiz verify-slide-quiz --site https://your-site --platform vercel --ws-url wss://your-cable/cable (from the create-slide-quiz package) checks the audience page, both functions, and a real broadcast round trip over the WebSocket. Run it after every deploy that touches the functions.