import { ElementRef, Renderer2, OnDestroy } from '@angular/core';
import { SelectComponent } from './select.component';
/** Utility directive to hold objects used in ngValue */
export declare class HcOptionDirective implements OnDestroy {
    private _element;
    private _renderer;
    private _select;
    /** id of the option element, use in identifying stringifyied values */
    _id: string;
    constructor(_element: ElementRef, _renderer: Renderer2, _select: SelectComponent);
    /** Tracks the value bound to the option element. Unlike the value binding, ngValue supports binding to objects. */
    ngValue: any;
    /** Tracks simple string values bound to the option element. For objects, use the `ngValue` input binding. */
    value: any;
    _setElementValue(value: string): void;
    ngOnDestroy(): void;
}