import { PipeTransform } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * Formats a 10-digit number or string to national code format.
 */
export declare class NationalCodePipe implements PipeTransform {
    /**
     * @param value a 10-digit number or a string only contains 10 digits.
     * @example 001-236547-5
     * @return a formatted text from 10-digit input or an empty string if length of the input is not 10.
     */
    transform(value: string | number): string;
    static ɵfac: i0.ɵɵFactoryDeclaration<NationalCodePipe, never>;
    static ɵpipe: i0.ɵɵPipeDeclaration<NationalCodePipe, "nationalCode">;
}