1 import {Except} from './except';
4 Create a type that requires at least one of the given keys. The remaining keys are kept as is.
8 import {RequireAtLeastOne} from 'type-fest';
17 const responder: RequireAtLeastOne<Responder, 'text' | 'json'> = {
18 json: () => '{"message": "ok"}',
23 export type RequireAtLeastOne<
25 KeysType extends keyof ObjectType = keyof ObjectType
27 // For each `Key` in `KeysType` make a mapped type:
28 [Key in KeysType]-?: Required<Pick<ObjectType, Key>> & // 1. Make `Key`'s type required
29 // 2. Make all other keys in `KeysType` optional
30 Partial<Pick<ObjectType, Exclude<KeysType, Key>>>;
32 // 3. Add the remaining keys not in `KeysType`
33 Except<ObjectType, KeysType>;