typescript version: 4.7.0
以下为测试代码

type d = {
  aa: string
  bb: string
}

type DeepCapitalize<T extends Record<string, any>> = {
  [K in keyof T as `${Capitalize<K & string>}`]: T[K]
}

type xx = DeepCapitalize<d>

以下为错误提示截图：