import { ElementRef, OnInit } from '@angular/core';
export declare class ButtonBusyDirective implements OnInit {
    private _element;
    buttonBusy: boolean;
    busyText: string;
    private _$button;
    private _$buttonInnerSpan;
    private _$buttonIcon;
    constructor(_element: ElementRef);
    ngOnInit(): void;
    refreshState(isBusy: boolean): void;
}