Re:Node v8.0.0 Released
by elmigranto on Tuesday May 30, 2017 @06:24PM
(#14449049)
A bunch of functions in core return multiple things to callback. A lot more in userland do the same. Spec or not, that is still something that needs to be accounted for.
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Those are handled by `util.promisify()` by having the original function define special properties on itself `Symbol('util.promisify.custom')` and `Symbol('customPromisifyArgs')`. But it's not something handled by default (e.g. resolving an array if the callback gets more than 2 arguments passed to it).