import { AbstractControl, ValidationErrors, ValidatorFn } from '@angular/forms';
export declare class ValidationUtil {
    static email(control: AbstractControl): ValidationErrors | null;
    static fullName(control: AbstractControl): ValidationErrors | null;
    static noMultipleWhitespace(control: AbstractControl): ValidationErrors | null;
    static isValidTaxId(control: AbstractControl): ValidationErrors | null;
    static isValidCpf(control: AbstractControl): ValidationErrors | null;
    private static charToValue;
    static isValidCnpj(control: AbstractControl): ValidationErrors | null;
    static majorAge(control: AbstractControl): ValidationErrors | null;
    static matchField(anotherField: AbstractControl | null): ValidatorFn;
    static cellphone(control: AbstractControl): ValidationErrors | null;
    static lowerThanOrEqualTo(greaterControlName: string): ValidatorFn;
    static greaterThanOrEqualTo(lowerControlName: string): ValidatorFn;
    static notSequentialNumbers(length: number): ValidatorFn;
    static firstLetterIsUppercase(control: AbstractControl): ValidationErrors | null;
    static containsLettersAndNumbers(control: AbstractControl): ValidationErrors | null;
    static greaterThanTo(lowerControlName: string): ValidatorFn;
    static onlyLetters(control: AbstractControl): ValidationErrors | null;
}