core/selector-channels

Use takeLatestFromSelector, takeEveryFromSelector, or takeLeadingFromSelector from @augmentcode/themis/saga instead of watching actions. Pass the named selector, an optional args tuple, and a worker that receives { payload, prevPayload }.

takeLatestFromSelector cancels the previous worker on each new emission and suits load or search-on-change flows. takeEveryFromSelector handles every emission independently, while takeLeadingFromSelector ignores new values during in-flight work.

Use createChannelFromSelector only for custom race, conditional loop, manual cancellation, or timeout flows. For simple load-on-change behavior the take*FromSelector helpers own channel creation and cleanup automatically.

Prefer primitive scalar args in the args tuple, such as [todoId]. Fresh object, array, or function literals break identity comparisons; construct stable references once before the helper call if object-keyed selectors are intentional.

Raw channels created with createChannelFromSelector keep a store subscription alive until closed. Closing in finally guarantees cleanup on cancellation or error, preventing leaked subscriptions and duplicate watchers.