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doc: improve AsyncLocalStorage introduction
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PR-URL: #36946
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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brillout authored and targos committed Feb 2, 2021
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Expand Up @@ -963,6 +963,11 @@ 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.
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