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evancz Mar 23, 2017 00:43
Just so folks are aware, one of the hard things about having ports just be a Task is the following. Right now, a Task is guaranteed to terminate with an error or a result. The only way it could be otherwise is if you have something of type Task Never Never Now, if you are calling out to random JS that is written by anyone, that guarantee goes away. You have to call some callback to give the value back to Elm, but what if that is never called? Maybe there's an error, maybe there is a weird code path. Now Elm code can "leak" tasks that never get completed because of problems in JS code. One way to protect against this is to have timeouts, such that there is some guaranteed end. My point here is just that it is more complicated than "what if it was a task?" and then everything would be nice.