Typescript 将键映射为大写

Question

我有以下对象：

const foo = {
  fieldAnt: "foo",
  fieldCab: "baz"
};

我想自动将其映射到键为大写并带下划线的类型：

type FIELDS = {
  FIELD_ANT: "fieldAnt",
  FIELD_CAB: "fieldCab" 
}

是否可以使用keyof打字稿或类型映射以编程方式实现此目的？

Answer 1

有点晚了：P但是，在一点帮助下我能够做到这一点：

const foo = {
  fieldAnt: "foo",
  fieldCab: "baz"
};

type CamelToSnakeCase<S extends string> =
  S extends `${infer T}${infer U}` ?
  `${T extends Capitalize<T> ? "_" : ""}${Lowercase<T>}${CamelToSnakeCase<U>}` :
  S

type Convert<T> = { [P in keyof T as Uppercase<CamelToSnakeCase<string & P>>]: P }

type Fields = Convert<typeof foo>
// type Fields = {
//  FIELD_ANT: "fieldAnt",
//  FIELD_CAB: "fieldCab" 
// }

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