javascript - 索引签名参数类型不能是联合类型。考虑改用映射对象类型

Question

我正在尝试使用以下模式:

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，但是我收到以下错误:

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

我做错了什么？

Answer 1

您可以使用 TS“in”运算符并执行此操作:

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