Throw, Result, or Neither?

19 hours ago

The author argues that business failures like out-of-stock or item limit should be returned as events rather than exceptions or Result types, allowing them to be queried and used in reports or workflows.
Exceptions are reserved for invalid operations (e.g., adding to a confirmed cart) or infrastructure errors (e.g., unavailable event store), while Result adds little value beyond success/failure classification in most popular languages.
Middleware like rejectOn, skipOn, stopOn, and stopAfter in Emmett allows flexible handling of events without persisting them, supporting different use cases (e.g., import rejection vs. saved-list restore).
Event sourcing enables selective persistence: the decision returns events, but the application decides whether to append them, avoiding unnecessary data retention.

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