mirror of
https://github.com/microsoft/TypeScript.git
synced 2025-11-18 17:21:48 +00:00
Nathan Shively-Sanders
8657dc10a7
Make the *technically* correct construction illegal: ```ts declare function f(n: number): void; declare var ns: number[]; f(1, ...ns); ``` This call only makes sense if `ns = []`, but in that case, why pass `ns` at all? Allowing this call masks other errors when functions are refactored to have fewer parameters, or to stop using rest parameters: ```ts declare function old(...ns: number[]): void; declare function new(ns: number | number[]): void; old(1, ...ns); // Fine! new(1, ...ns); // Should error! ``` This change the error for excess spread arguments to be more understandable: "Expected 3 arguments, but got least 4". Previously the error would have been "Expected 3 argument, but got at least 3", which is, again, technically correct, but not understandable.