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Incorrect type for `zip` function when arrays have different sizes

#1609Closedjonatanschroeder 创建于 2026-02-07
p2: type enhancement
Consider the call: ```ts import { zip } from 'es-toolkit'; const result = zip([1, 2, 3], ['a', 'b']); // [ [ 1, 'a' ], [ 2, 'b' ], [ 3, undefined ] ] ``` If I check the type of `result`, it becomes `[number, string][]`, instead of `[number | undefined, string | undefined][]`. In essence, if the arrays don't have the same size, the resulting entries may include undefined values, but the type of the corresponding entries does not include the `undefined` that is used as a filler.
关闭于 2026-03-19 1 条评论