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docs: clarify that async_hook callbacks cannot be async #37384

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docs: clarify that async_hook callbacks cannot be async #37384

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4 changes: 4 additions & 0 deletions doc/api/async_hooks.md
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Expand Up @@ -129,6 +129,10 @@ class MyAddedCallbacks extends MyAsyncCallbacks {
const asyncHook = async_hooks.createHook(new MyAddedCallbacks());
```

Because promises are asynchronous resources whose lifecycle is tracked
via the async hooks mechanism, the `init()`, `before()`, `after()`, and
`destroy()` callbacks *must not* be async functions that return promises.

##### Error handling

If any `AsyncHook` callbacks throw, the application will print the stack trace
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