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): (entity: Entity) => boolean;
type 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);
// @ts-expect-error
const validator3 = createValidation<User>('luckyNumber', value => value > 0);
// Error: Argument of type '"luckyNumber"' is not assignable to parameter of type '"name" | "surname"'.
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...