import type { AdditionalProperties, InferValidation, Validation, Validator } from './types';
/** Internal definition of `allowAdditionalProperties(...)` */
declare function additionalProperties(): AdditionalProperties<Validator<any>>;
declare function additionalProperties(allow: true): AdditionalProperties<Validator<any>>;
declare function additionalProperties(allow: false): AdditionalProperties<false>;
declare function additionalProperties<V extends Validation>(validation: V): AdditionalProperties<Validator<InferValidation<V>>>;
declare namespace additionalProperties { }
/**
 * Allow additional properties in `Schema`s.
 *
 * This function can be called with a `boolean` argument (`true` allow _any_
 * additional property, `false` do not allow additional properties) or with a
 * `Validation` that will be used to validate additional properties.
 *
 * @param allow - A `boolean` or a `Validator` instance
 */
export declare const allowAdditionalProperties: typeof additionalProperties & AdditionalProperties<Validator<any>>;
export {};