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