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Function that always throws is not inferred as having never return type #16608
Description
TypeScript Version: 2.5.0-dev.20170618
Code
function fail1() {
throw new Error()
}
const fail2 = function () {
throw new Error()
}Expected behavior:
Inferred return type of both functions is never
Actual behavior:
Only the return type of the second function is never. The return type of fail1 is inferred as void.
Activity
ahejlsberg commentedon Jun 19, 2017
This is by design. We had it the way you suggest originally but I was too much of a breaking change. See #8767 for more details.
masaeedu commentedon Jun 19, 2017
Anders Hejlsberg (@ahejlsberg) Could we have an off-by-default compiler flag that unifies this behavior?
basarat commentedon Jun 19, 2017
Perhaps only class methods should get
voidinference 🌹mhegazy commentedon Aug 17, 2017
Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.
aluanhaddad commentedon Nov 7, 2017
I really like Basarat Ali Syed (@basarat)'s suggestion.