Type Alias RequiredKeys<T>

RequiredKeys: { [K in keyof T]-?: undefined extends T[K] ? never : K }[keyof T]

Extracts the keys of T that are required (non-optional)

提取 T 中必填的键（非可选）

Type Parameters

T extends object

Example

interface Person {
  name: string
  age?: number
  address: string
}
type Keys = RequiredKeys<Person>
// 'name' | 'address'