Complete <T>

Complete<T>: { [P in keyof Required<T>]: Pick<T, P> extends Required<Pick<T, P>> ? T[P] : T[P] | undefined }

Makes optional keys required and add the the undefined type.

interface Test {
 foo: number;
 bar?: number;
 baz: number | undefined;
}

Complete<Test> {
 foo: number;
 bar: number | undefined;
 baz: number | undefined;
}

See https://medium.com/terria/typescript-transforming-optional-properties-to-required-properties-that-may-be-undefined-7482cb4e1585

Type Parameters