索引签名参数类型不能为联合类型.考虑改用映射对象类型 [英] An index signature parameter type cannot be a union type. Consider using a mapped object type instead

问题描述

我正在尝试使用以下模式:

I'm trying to use the following pattern:

enum Option {
  ONE = 'one',
  TWO = 'two',
  THREE = 'three'
}

interface OptionRequirement {
  someBool: boolean;
  someString: string;
}

interface OptionRequirements {
  [key: Option]: OptionRequirement;
}

这对我来说似乎很简单，但是出现以下错误:

This seems very straightforward to me, however I get the following error:

索引签名参数类型不能为联合类型.考虑改用映射的对象类型.

An index signature parameter type cannot be a union type. Consider using a mapped object type instead.

我在做什么错了?

推荐答案

您可以在运算符，然后执行以下操作:

You can use TS "in" operator and do this:

enum Options {
  ONE = 'one',
  TWO = 'two',
  THREE = 'three',
}
interface OptionRequirement {
  someBool: boolean;
  someString: string;
}
type OptionRequirements = {
  [key in Options]: OptionRequirement; // Note that "key in".
}

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