wait until cancelled

[yonadav]

i have a side effects saga that executes effects by takeEvery(setStateChange, genEffectHandler)
and when the parent of that saga is done i'd like to cancel all of these effects.

export default function* sagaRoot() {
	const tasks = [];
	...
	tasks.push(yield fork(sagaSideEffects));
	try {
		...
	} finally {
		// root ended - cancelling forked children!
		yield all(tasks.map((task) => cancel(task)));
		...
	}
}

export function* sagaSideEffects() {
	...
	const tasks = [];
	try {
		tasks.push(
			yield takeEvery(setState.type, setStateEffectHandler),
			...
		);
		// so now i need to wait until the root is cancelling me.
		// is there a less stupid way to wait ?
		// like yield take(cancelled) ?
		while (yield delay(999999999));
	} catch (e) {
		errorHandlerService.send({
			error: e,
			section: 'watchMeetingSideEffects'
		});
	} finally {
		if (yield cancelled()) {
			yield all(tasks.map((task) => cancel(task)));
		}
		...
	}
}

is there a good way to 'wait until cancelled' ?

[Mateusz Burzyński]

You'd have to introduce smth like block:

function block() {
  return call(() => new Promise(() => {}))
}

// ...
yield block()