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Async Local Storage is Here to Help You
- Async Local Storage is a feature introduced in Node.js, initially added in versions v13.10.0 and v12.17.0, and later stabilized in v16.4.0
- The feature enables the creation of a shared context that multiple asynchronous functions can access without explicitly passing it
- Async Local Storage is neither browser-related nor a typical storage mechanism
- A pattern for using AsyncLocalStorage is to initialize an instance of it, which takes a generic type parameter during initialization
- Async Local Storage is used in the implementation of Next.js cookies and in building custom contexts in nearly any server framework
- Despite its benefits, Async Local Storage may introduce too much 'magic' into the code and importing the context into a module creates a new dependency that needs to be managed
- When using Async Local Storage, it is possible to maintain separate contexts for authentication, logging, feature flags, etc.
- In a context like authentication, AsyncLocalStorage can help avoid breaking DRY principles and prevent passing values through deeply nested function calls
- Async Local Storage can be useful for handling request-based scenarios that need to pass information around between the different parts of a stack
- AsyncLocalStorage.run() creates an asynchronous execution context that's passed to all subsequent asynchronous calls within the current stack
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