doc: improve AsyncLocalStorage introduction

PR-URL: #36946 Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Stephen Belanger <[email protected]> Reviewed-By: Andrey Pechkurov <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · May 1, 2021 · 49f1374 · 49f1374
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commit 49f1374
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diff --git a/doc/api/async_hooks.md b/doc/api/async_hooks.md
@@ -955,6 +955,11 @@ chains. It allows storing data throughout the lifetime of a web request
 or any other asynchronous duration. It is similar to thread-local storage
 in other languages.
 
+While you can create your own implementation on top of the `async_hooks` module,
+`AsyncLocalStorage` should be preferred as it is a performant and memory safe
+implementation that involves significant optimizations that are non-obvious to
+implement.
+
 The following example uses `AsyncLocalStorage` to build a simple logger
 that assigns IDs to incoming HTTP requests and includes them in messages
 logged within each request.