import { AbstractControl, ValidationErrors, ValidatorFn } from "@angular/forms";
/**
 * Function that has `ValidatorFn` shape, but performs no operation.
 */
export declare function nullValidator(control: AbstractControl): ValidationErrors | null;
export declare class Validators {
    /**
    * @description
    * Validator that requires the control's value to be less than or equal to the provided number.
    *
    * @usageNotes
    *
    * ### Validate against a range 0 - 15
    *
    * ```typescript
    * const control = new FormControl(16, Validators.max([0,15]));
    *
    * console.log(control.errors); // {range: {min: 0, max: 15, actual: 16}}
    * ```
    *
    * @returns A validator function that returns an error map with the
    * `range` property if the validation check fails, otherwise `null`.
    *
    * @see `updateValueAndValidity()`
    *
    */
    static range(min: number, max: number): ValidatorFn;
    /**
* @description
* Validator that requires the control's value to be less than or equal to the provided number.
*
* @usageNotes
*
* ### Validate against a range 0 - 15
*
* ```typescript
* const control = new FormControl(16, Validators.max([0,15]));
*
* console.log(control.errors); // {range: {min: 0, max: 15, actual: 16}}
* ```
*
* @returns A validator function that returns an error map with the
* `range` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
    static match(value: string): ValidatorFn;
}
/**
 * Validator that requires the control's value to be between provided numbers.
 * See `Validators.range` for additional information.
 */
export declare function rangeValidator(range: Array<number>): ValidatorFn;
export declare function matchValidator(input: string): ValidatorFn;