Type Alias RequiredKeys<T>

RequiredKeys: { [K in keyof T]-?: {} extends Pick<T, K> ? never : K }[keyof T]

Extract the keys of required properties.

Type Parameters

T
Object type to analyze

Remarks

Identifies properties that must be present and do not allow undefined.

Example

type Obj = { a: number; b?: string; c: number | undefined; d: boolean };
type ReqKeys = RequiredKeys< Obj >;
// "a" | "d"