import { AbstractControl, ValidatorFn } from '@angular/forms';
/**
 * @whatItDoes Provides a set of validators used by form controls.
 *
 * A validator is a function that processes a {\@link FormControl} or collection of
 * controls and returns a map of errors. A null map means that validation has passed.
 *
 * ### Example
 *
 * ```typescript
 * var loginControl = new FormControl("", Validators.required)
 * ```
 *
 */
export declare class Validators {
    private static delta;
    /**
     * Validator that requires controls to have a value larger than provided.
     * @param {?} min
     * @return {?}
     */
    static largerThan(min: number): ValidatorFn;
    /**
     * Validator that requires controls to have a value smaller than provided.
     * @param {?} max
     * @return {?}
     */
    static smallerThan(max: number): ValidatorFn;
    static notEqual(validationValue: number, delta?: number): ValidatorFn;
    static fieldsEqual(a: string, b: string): ValidatorFn;
    static fieldsNotEqual(a: string, b: string): ValidatorFn;
    static xor(a: string, b: string): ValidatorFn;
    static uniqueArray(key: string): ValidatorFn;
    static email(control: AbstractControl): {
        [key: string]: any;
    };
    static multiUniqueArray(...keys: string[]): ValidatorFn;
    static firstItemUnique(...keys: string[]): ValidatorFn;
    static isInArray(options: any[]): ValidatorFn;
}