import 'reflect-metadata';
import { TypedPropertyDecorator, CustomValidator } from '../types';
/** Decorators for validation purposes. */
export declare abstract class Validation {
    /**
     * Makes a property required. 'Unprovided' values (null, undefined, '') are
     * invalid, as is NaN. Anything else is valid (including: 0, 0n, false).
     */
    static readonly required: PropertyDecorator;
    /**
     * Makes a property forbidden. 'Unprovided' values (null, undefined, '') are
     * valid. Anything else is considered invalid (including: 0, 0n, false).
     */
    static readonly forbidden: PropertyDecorator;
    /**
     * Associates a string or array with a minimum length. 'Unprovided' values
     * (null, undefined, '') are not tested hence valid. Otherwise the string
     * length must not be less than the bound supplied.
     * @param lBound The minimum length.
     */
    static readonly minLength: <T>(lBound: number) => TypedPropertyDecorator<ArrayLike<T>>;
    /**
     * Associates a string or array with a maximum length. 'Unprovided' values
     * (null, undefined, '') are not tested hence valid. Otherwise the string
     * length must not exceed the upper bound supplied.
     * @param uBound The maximum length.
     */
    static readonly maxLength: <T>(uBound: number) => TypedPropertyDecorator<ArrayLike<T>>;
    /**
     * Associates a property with a minimum value. 'Unprovided' values (null,
     * undefined, '') are not tested hence valid. Otherwise the value must not be
     * less than the lower bound supplied to be valid.
     * @param lBound The minimum value.
     */
    static readonly min: <T extends Number | Date>(lBound: T) => TypedPropertyDecorator<T | ArrayLike<T>>;
    /**
     * Associates a number or date property with a maximum value. 'Unprovided'
     * values (null, undefined, '') are not tested hence valid. Otherwise the
     * value must not exceed the upper bound supplied to be valid.
     * @param uBound The maximum value.
     */
    static readonly max: <T extends Number | Date>(uBound: T) => TypedPropertyDecorator<T | ArrayLike<T>>;
    /**
     * Associates a property with minimum and maximum values. 'Unprovided' values
     * (null, undefined, '') are not tested hence valid. Otherwise the value must
     * be (inclusively) between the lower and upper bounds.
     * @param lBound The minimum value.
     */
    static readonly range: <T extends Number | Date>(lBound: T, uBound: T) => TypedPropertyDecorator<T | ArrayLike<T>>;
    /**
     * Associates a property with a pattern. 'Unprovided' values (null, undefined,
     * '') are not tested hence valid. Otherwise the result of .toString() must
     * match the regex supplied to be valid.
     * @param regex The validation pattern.
     */
    static readonly regex: (regex: string | RegExp) => PropertyDecorator;
    /**
     * Associates a property with a predefined set of allowed values. Primitive
     * types, enums and arrays thereof are all supported.
     */
    static readonly options: <T extends String | Number | Boolean>(...opts: T[]) => TypedPropertyDecorator<T | ArrayLike<T>>;
    /**
     * Associates a property with a custom validator. Unlike most other validation
     * decorators, ALL values will be tested (rather than being skipped if it was
     * deemed 'unprovided') - the decision is not taken on the caller's behalf. If
     * the function returns false, the value is deemed invalid and a generic error
     * is used. Else if it returns a string, this string is used as the message,
     * with null or empty strings taken to indicate that the value is valid).
     */
    static readonly custom: <T>(fn: CustomValidator) => TypedPropertyDecorator<T>;
}