具有最小长度的 TypeScript 数组 [英] TypeScript array with minimum length

问题描述

如何在 TypeScript 中创建只接受具有两个或更多元素的数组的类型?

How can you create a type in TypeScript that only accepts arrays with two or more elements?

needsTwoOrMore(["onlyOne"]) // should have error
needsTwoOrMore(["one", "two"]) // should be allowed
needsTwoOrMore(["one", "two", "three"]) // should also be allowed

推荐答案

这可以通过类似的类型来完成:

This can be accomplished with a type like:

type ArrayTwoOrMore<T> = {
    0: T
    1: T
} & Array<T>

declare function needsTwoOrMore(arg: ArrayTwoOrMore<string>): void

needsTwoOrMore(["onlyOne"]) // has error
needsTwoOrMore(["one", "two"]) // allowed
needsTwoOrMore(["one", "two", "three"]) // also allowed

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