export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
    return new Response("Hello, World!");
  },
} satisfies ExportedHandler<Env>;

// wrangler.jsonc
{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2025-03-07",
  "compatibility_flags": ["nodejs_compat"],
  "observability": {
    "enabled": true,
    "head_sampling_rate": 1
  }
}

# Development
npx wrangler dev              # Local dev (Miniflare)
npx wrangler dev --remote     # Remote dev (code on Cloudflare)

# Deployment
npx wrangler deploy           # Deploy to production
npx wrangler versions upload  # Upload without deploying
npx wrangler versions deploy  # Promote version

# Secrets
npx wrangler secret put KEY   # Add secret
npx wrangler secret list      # List secrets

# Types
npx wrangler types            # Generate TypeScript types

# wrangler.toml
compatibility_date = "2025-03-07"
compatibility_flags = ["nodejs_compat"]

export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    const url = new URL(request.url);

    if (url.pathname === "/api/hello") {
      return Response.json({ message: "Hello!" });
    }

    if (url.pathname.startsWith("/static/")) {
      return env.ASSETS.fetch(request);
    }

    return new Response("Not Found", { status: 404 });
  },
};

export default {
  async scheduled(controller: ScheduledController, env: Env, ctx: ExecutionContext) {
    ctx.waitUntil(doBackgroundWork(env));
  },
};

# wrangler.toml
[triggers]
crons = ["0 * * * *"]  # Every hour

export default {
  async queue(batch: MessageBatch, env: Env, ctx: ExecutionContext) {
    for (const message of batch.messages) {
      console.log(message.body);
      message.ack();
    }
  },
};