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]: (
|
// …by picking that Key's type and making it required
|
Required<Pick<ObjectType, Key>>
|
)
|
}[KeysType]
|
// …then, make intersection types by adding the remaining keys to each mapped type.
|
& Except<ObjectType, KeysType>;
|
