core/redux-saga

Create middleware with createSagaMiddleware(options), mount it via applyMiddleware when creating the Redux store, then call sagaMiddleware.run(rootSaga). The run call is only valid after the middleware is connected to the store.

takeEvery forks a concurrent worker for every matching action, takeLatest cancels any stale running worker when a new action arrives, and takeLeading ignores new actions while a worker is running. All three also accept a Channel instead of a pattern.

Use fork for attached tasks: parent completion waits for children, child errors bubble up, and cancellation propagates downward. spawn creates detached tasks without that lifecycle linkage, and this repository explicitly forbids introducing detached spawn.

Although redux-saga ships a native debounce helper, this repository requires explicit debounce: watch the action with takeLatest or takeLeading and place a delay inside the worker so cancellation semantics stay visible. Do not add action-wrapper debounce utilities.

take(pattern) and take(channel) auto-terminate when they receive the END sentinel from a closed channel. Use takeMaybe instead when the saga must receive the END object and handle the closed-input case itself.

Use cloneableGenerator from @redux-saga/testing-utils for branch testing without replaying setup yields, and createMockTask for fork, join, and cancel flows. Prefer effect-level assertions for small generators and integration tests for cancellation and channel cleanup.