/**
 * Represents a validation constraint.
 * @author Alex Bogdanovski <alex@erudika.com>
 * @param {String} constraintName name
 * @param {Object} constraintPayload payload
 * @returns {Constraint}
 */
export default class Constraint {
    /**
     * The 'required' constraint - marks a field as required.
     * @returns {Constraint}
     */
    static required(): Constraint;
    /**
     * The 'min' constraint - field must contain a number larger than or equal to min.
     * @param {Number} min the minimum value
     * @returns {Constraint}
     */
    static min(min: number): Constraint;
    /**
     * The 'max' constraint - field must contain a number smaller than or equal to max.
     * @param {Number} max the maximum value
     * @returns {Constraint}
     */
    static max(max: number): Constraint;
    /**
     * The 'size' constraint - field must be a String, Object or Array
     * with a given minimum and maximum length.
     * @param {Number} min the minimum length
     * @param {Number} max the maximum length
     * @returns {Constraint}
     */
    static size(min: number, max: number): Constraint;
    /**
     * The 'digits' constraint - field must be a Number or String containing digits where the
     * number of digits in the integral part is limited by 'integer', and the
     * number of digits for the fractional part is limited
     * by 'fraction'.
     * @param {Number} i the max number of digits for the integral part
     * @param {Number} f the max number of digits for the fractional part
     * @returns {Constraint}
     */
    static digits(i: number, f: number): Constraint;
    /**
     * The 'pattern' constraint - field must contain a value matching a regular expression.
     * @param {String} regex a regular expression
     * @returns {Constraint}
     */
    static pattern(regex: string): Constraint;
    /**
     * The 'email' constraint - field must contain a valid email.
     * @returns {Constraint}
     */
    static email(): Constraint;
    /**
     * The 'falsy' constraint - field value must not be equal to 'true'.
     * @returns {Constraint}
     */
    static falsy(): Constraint;
    /**
     * The 'truthy' constraint - field value must be equal to 'true'.
     * @returns {Constraint}
     */
    static truthy(): Constraint;
    /**
     * The 'future' constraint - field value must be a Date or a timestamp in the future.
     * @returns {Constraint}
     */
    static future(): Constraint;
    /**
     * The 'past' constraint - field value must be a Date or a timestamp in the past.
     * @returns {Constraint}
     */
    static past(): Constraint;
    /**
     * The 'url' constraint - field value must be a valid URL.
     * @returns {Constraint}
     */
    static url(): Constraint;
    constructor(constraintName: any, constraintPayload: any);
    /**
     * The constraint name.
     * @returns {String} a name
     */
    getName: () => string;
    /**
     * Sets the name of the constraint.
     * @param {String} n name
     */
    setName: (n: string) => void;
    /**
     * The payload (a map)
     * @returns {Object} an object
     */
    getPayload: () => any;
    /**
     * Sets the payload.
     * @param {Object} p the payload object
     */
    setPayload: (p: any) => void;
}