import { AfterContentInit, ElementRef, OnDestroy } from '@angular/core';
import { NgControl } from '@angular/forms';
import { InputToken } from './input';
export declare class InputDirective extends InputToken implements AfterContentInit, OnDestroy {
    protected _elementRef: ElementRef<HTMLInputElement | HTMLSelectElement | HTMLTextAreaElement>;
    ngControl: NgControl;
    height: string;
    private _classChangeObserver;
    constructor(_elementRef: ElementRef<HTMLInputElement | HTMLSelectElement | HTMLTextAreaElement>, ngControl: NgControl);
    onFocus(): void;
    ngAfterContentInit(): void;
    ngOnDestroy(): void;
    focus(): void;
}