如何将字符串的打字稿类型转换为字符串数组? [英] How to convert typescript types of strings to array of strings?

问题描述

我有这种类型:

type myCustomType = "aaa" | "bbb" | "ccc";

我需要将其转换为这样的数组:

I need to convert it to an array like this:

["aaa", "bbb", "ccc"]

我如何在打字稿中做到这一点?

How can I do this in typescript?

推荐答案

类型在发出的代码中不存在 - 你不能从 type 到 array.

Types do not exist in emitted code - you can't go from a type to an array.

但在某些情况下，您可以反过来.如果数组不是动态的(或者它的值可以在初始化时完全由类型检查器确定)，则可以将数组声明为 为 const(这样数组的类型为 ["aaa", "bbb", "ccc"] 而不是 string[])，然后通过从 arr[number] 映射它的值来创建一个类型:

But you could go the other way around, in some situations. If the array is not dynamic (or its values can be completely determined by the type-checker at the time it's initialized), you can declare the array as const (so that the array's type is ["aaa", "bbb", "ccc"] rather than string[]), and then create a type from it by mapping its values from arr[number]:

const arr = ["aaa", "bbb", "ccc"] as const;
type myCustomType = typeof arr[number];

下面是一个例子操场上.

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