No way to introduce an error into a stream about kefir HOT 4 CLOSED

Hi, there is number of methods that can help you to do this. You already mentioned flatMap, and there is also valuesToErrors and withHandler.

About flatMap example not working without onValue handler, I can't reproduce that. This works fine:

Kefir.constant('hello').
flatMap(function(x) { return Kefir.constantError(new Error(x)); }).
onError(function(e) { console.error('GOT ERROR', e) });
// > GOT ERROR Error: hello {stack: (...), message: "hello"}

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And to answer the question "the _active property only is true when there is a onValue handler?": No, all handlers (onValue, onError, onEnd, onAny) activate the observable.

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The flatMap.onError does work for me. For some reason when I was testing it, but I fear I probably messed something up while figuring this out (most likely a copy-paste mess up 😞 ).

Thanks for the great effort and contribution to the community! 👍

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Sorry, just noticed, I wrote errorsToValues, but it should be valuesToErrors of course. But I guess you've figured that out already :)

(fixed in the original comment)

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