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Contents
/**
Extract all required keys from the given type.
This is useful when you want to create a new type that contains different type values for the required keys only or use the list of keys for validation purposes, etc...
@example
```
import type {RequiredKeysOf} from 'type-fest';
declare function createValidation<Entity extends object, Key extends RequiredKeysOf<Entity> = RequiredKeysOf<Entity>>(field: Key, validator: (value: Entity[Key]) => boolean): ValidatorFn;
interface User {
name: string;
surname: string;
luckyNumber?: number;
}
const validator1 = createValidation<User>('name', value => value.length < 25);
const validator2 = createValidation<User>('surname', value => value.length < 25);
```
@category Utilities
*/
export type RequiredKeysOf<BaseType extends object> = Exclude<{
[Key in keyof BaseType]: BaseType extends Record<Key, BaseType[Key]>
? Key
: never
}[keyof BaseType], undefined>;
Version data entries
61 entries across 61 versions & 3 rubygems