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Contents
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>;
Version data entries
61 entries across 61 versions & 4 rubygems