import { PipeTransform, TrackByFunction } from '@angular/core';
import { SafeAny, SafeString } from '../type/type';
/**
 * Get first letter of a input string.
 *
 * @author Federico Gambardella<fedega86@libero.it>
 * @param {SafeString} stringInput
 */
export declare class FirstLetterPipe implements PipeTransform {
    transform(stringInput: SafeString): string;
}
/**
 * Return object or value of the object by property.
 *
 * @author Federico Gambardella<fedega86@libero.it>
 * @param  {SafeAny} object
 * @param  {string} property
 */
export declare class ItemObjectPipe implements PipeTransform {
    transform(object: SafeAny, property: string): SafeAny;
}
/**
* Pipe that check if an array of element is equal to another one.
*
* @author Federico Gambardella<fe.gambardella@reply.it>
* @param {any} element
* @param {any | any[]} expectedElementList
* @return {boolean}
*/
export declare class IsEqualPipe implements PipeTransform {
    transform(element: any, expectedElementList: any[] | any): boolean;
}
/**
 * Track by property.
 *
 * @author Federico Gambardella<fedega86@libero.it>
 * @param  {any} propertyName
 * @return {TrackByFunction<any>}
 */
export declare class TrackByPropertyPipe implements PipeTransform {
    transform(propertyNames: "$index"): TrackByFunction<any>;
    transform(propertyNames: string): TrackByFunction<any>;
    transform(propertyNames: string[]): TrackByFunction<any>;
}
export declare class ConcatPipe implements PipeTransform {
    transform(stringInput: SafeString, stringToConcat: SafeString): string;
}
/**
 * Return value of the object if this exsist oterwise return teh object.
 *
 * @author Federico Gambardella<fedega86@libero.it>
 * @param  {SafeAny} object
 * @param  {string} property
 */
export declare class ObjectValuePipe implements PipeTransform {
    transform(object: SafeAny, property: string): SafeAny;
}
/**
* Return value of the object if this exsist oterwise return teh object.
*
* @author Federico Gambardella<fedega86@libero.it>
* @param  {SafeAny} object
* @param  {boolean} property
*/
export declare class IfPipe implements PipeTransform {
    transform(object: SafeAny, condition: boolean): SafeAny;
}
export declare class KeysPipe implements PipeTransform {
    transform(value: SafeAny): any;
}