stephenh / async-local-storage-repro

Reproduction Steps

We have a basic usage of AsyncLocalStorage (see index.js):

import { AsyncLocalStorage } from "async_hooks";
const asl = new AsyncLocalStorage();

async function pretendDbCall() {
}

async function doWork() {
  return new Promise((resolve) => {
    asl.run({value: "1234"}, async () => {
      console.log(asl.getStore());
      await pretendDbCall();
      console.log(asl.getStore());
      resolve();
    });
  });
}

doWork().then(() => console.log("done"));

Invoked via nodejs directly works

This works in nodejs 16.2.0 when invoked directly (we see value: 1234 twice):

$ node index.js
{ value: '1234' }
{ value: '1234' }
done

Invoked via jest doesn't work

However, when running the same code snippet in (see index.test.js) via jest:

node --experimental-vm-modules node_modules/.bin/jest
 PASS  ./index.test.js
  asl
    ✓ works (17 ms)

  console.log
    { value: '1234' }

      at index.test.js:13:19

  console.log
    undefined

      at index.test.js:15:19

The 2nd asl.getStore() returns undefined.

Invoke via jest + detectOpenHandles does works

Note that running Jest and detectOpenHandles restores the behavior:

node --experimental-vm-modules node_modules/.bin/jest --detectOpenHandles
 PASS  ./index.test.js
  asl
    ✓ works (17 ms)

  console.log
    { value: '1234' }

      at index.test.js:13:19

  console.log
    { value: '1234' }

      at index.test.js:15:19

Working vs. Broken Matrix

Node Version	Invoked Via	Result
16.1.0	node	works
16.1.0	jest	works
16.1.0	jest + detectOpenHandles	works
16.2.0	node	works
16.2.0	jest	broken
16.2.0	jest + detectOpenHandles	works