fromEvent type error: Should it be thrown at Subscription time?

[benlesh]

Currently, we have a behavior where if you provide an object to fromEvent that is not a valid target, it does not error until you try to subscribe to the result. I submit that this is probably a bad behavior, and we should notify the developer as soon as we know it's incorrect.

We have three choices:

1. Throw on subscribe (as is)
2. Throw when fromEvent is called.
3. Don't throw at all and let things just fail.

I suspect that 2 is the proper choice here.

[benlesh]

@cartant says "Number two" 💩

[KamilSocha91]

@benlesh So this is resolved discussion and number 2 should be implemented?