import { Struct } from './struct';
/**
* Augment a string or array struct to constrain its length to zero.
*/
export declare function empty<T extends string | any[]>(S: Struct<T>): Struct<T>;
/**
* Augment a string or array struct to constrain its length to being between a
* minimum and maximum size.
*/
export declare function length<T extends string | any[]>(S: Struct<T>, min: number, max: number): Struct<T>;
/**
* Refine a string struct to match a specific regexp pattern.
*/
export declare function pattern<T extends string>(S: Struct<T>, regexp: RegExp): Struct<T>;
/**
* Augment a `Struct` to add an additional refinement to the validation.
*/
export declare function refinement<T>(struct: Struct<T>, type: string, refiner: Struct<T>['refiner']): Struct<T>;
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