1
// Copyright (c) 2022-2023 Cloudflare, Inc.
2
// Licensed under the Apache 2.0 license found in the LICENSE file or at:
3
//     https://opensource.org/licenses/Apache-2.0
4
 
5
import { AsyncLocalStorage, AsyncResource } from 'node:async_hooks';
6
 
7
const als = new AsyncLocalStorage();
8
 
9
export default {
10
  async fetch(request) {
11
    const differentScope = als.run(123, () => AsyncResource.bind(() => {
12
      console.log(als.getStore());
13
    }));
14
 
15
    return als.run("Hello World", async () => {
16
 
17
      // differentScope is attached to a different async context, so
18
      // it will see a different value for als.getStore() (123)
19
      setTimeout(differentScope, 5);
20
 
21
      // Some simulated async delay.
22
      await scheduler.wait(10);
23
      return new Response(als.getStore());  // "Hello World"
24
    });
25
  }
26
};