You can't cancel a JavaScript promise (except sometimes you can)

JavaScript lacks a built-in method for canceling promises, presenting challenges in interrupting async functions smoothly without leaving resources in a compromised state. While the TC39 committee considered adding cancellation in 2016, the proposal was abandoned due to concerns about the complexity it would introduce. An alternative method involves using a promise that never resolves, which effectively stops a function without throwing exceptions or requiring special handling in the code, as demonstrated by the Inngest TypeScript SDK for interrupting async workflows in serverless environments. This method allows for memoization of steps and continuation across multiple invocations, while relying on JavaScript's garbage collector to handle suspended functions without memory leaks, provided that no references to these promises remain. Although generators offer a clean interruption mechanism, they impose a different syntax, whereas the unresolved promise approach maintains the familiar async/await syntax without the pitfalls of try/catch swallowing interruptions, thus enabling a seamless control flow in JavaScript applications.

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