相关疑难解决方法(0)

有没有办法将联合类型转换为交集类型:

type FunctionUnion = () => void | (p: string) => void
type FunctionIntersection = () => void & (p: string) => void

我想应用转换FunctionUnion来获取FunctionIntersection

如何缩小/分裂/分解一种可能受歧视的联合类型？

kind: "bar"例如，在下面我想获取来自from的类型MyUnion。

type MyUnion = { kind: "foo", foo: number } | { kind: "bar", bar: string };

// Here I want to somehow get the type { kind: "bar", bar: string } from MyUnion
type Narrowed = NarrowUnion<MyUnion, { kind: "bar" }>;

我有一个与此类似的对象类型：

type Fields = {
  countryCode: string;
  currency: string;
  otherFields: string;
};

我还有一个与此类似的只读数组：

// Type: readonly ["countryCode", "currency", "otherFields"]
const allowedFields = ["countryCode", "currency", "otherFields"] as const;

我希望能够根据Fields对象类型为此数组声明指定一个接口，以便对其进行任何更改也需要更改数组。像这样的东西：

// How to create 'SomeType'?
const allowedFields: SomeType = ["countryCode"] as const; // Should throw error because there are missing fields

const allowedFields: SomeType = ["extraField"] as const; // Should throw error because "extraField" is not in the object type 'Fields'