如何从 TypeScript 中的枚举值构建类型? [英] How to build a type from enum values in TypeScript?

问题描述

鉴于以下内容:

enum FooKeys {
  FOO = 'foo',
  BAR = 'bar',
}

我想制作一个这样的界面，但不是手动定义键，而是使用枚举的值构建它.

I'd like to make an interface like this one, but instead of defining keys by hand, build it out of enum's values.

interface Foo {
  foo: string
  bar: string
}

TypeScript 可以实现类似的功能吗?

Is something like this possible with TypeScript?

谢谢！

推荐答案

是的，您可以使用枚举值作为键.您可以使用映射类型，就像标准库的记录 防止重复:

Yes, you can use enum values as keys. And you can use a mapped type like the standard library's Record<K, V> to prevent repetition:

enum FooKeys {
  FOO = 'foo',
  BAR = 'bar',
}

// probably all you need, but it's a type alias
type FooType = Record<FooKeys, string>;

// if you need an interface instead you can do this
interface FooInterface extends FooType {};

您可以验证它是否有效:

And you can verify that it works:

declare const foo: FooInterface;
foo.foo; // okay
foo[FooKeys.FOO]; // okay

foo.bar; // okay
foo[FooKeys.BAR]; // okay

foo.baz; // error

这对你有用吗?祝你好运！

Does that work for you? Good luck!

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