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Type inference for generic functions #11537
Description
Activity
might be
dupa new shiny case of #3038Reacted by Sergey ShandarIf it's compatibility problem, it would be really helpful to have a "strictTyping" compilation mode which would prohibit converting the
anytype to other types without explicit cast.Reacted by Sergey Shandarthey say without
anyit will be an infinite recursion which i don't get because an explicit lambda (v => vin your case) doesn't have this problem, if so.. why would not TS handle all function references as explicit lambdas behind the scenes to avoid this recursion problemAn ugly workaround
function getId<T>(): (v: T) => T { return v => v; } applyToNumber(5, getId()); // error, can't infer the 'T' type. applyToNumber(5, getId<number>()); // ok but 'v => v' looks better.
looks like its time to bite that bullet or else you gonna break that all time record of the number of open issues related to the same problemo
The sample given:
applyToNumber("aaa", id); // ok, but an error is expected.
in TS 2.6 returns error:
Argument of type '<T>(v: T) => T' is not assignable to parameter of type '(x: string) => number'. Type 'string' is not assignable to type 'number'.So I assume it's fixed.
Reacted by Sergey Shandarthanks! closing.
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on Jun 19, 2018
TypeScript Version: 2.0.3
Code
Expected behavior:
error
Actual behavior:
no error.