import { FormArray } from '@angular/forms';
export declare type CustomErrorKeys = 'repeated';
export interface CustomErrorMessages {
    [key: string]: string;
}
export interface CustomError {
    [key: string]: CustomErrorRepeatedValues;
}
export interface CustomErrorRepeatedValues {
    repeatedValues: string;
}
export declare class CustomValidationService {
    private readonly _customMessages;
    constructor();
    static formArrayRepeatedValues(control: FormArray): CustomError | null;
    getCustomMessages(keys: CustomErrorKeys | Array<CustomErrorKeys>): CustomErrorMessages;
}