import { EventEmitter, OnDestroy, OnInit } from '@angular/core';
import { Observable } from 'rxjs';
/**
 * A button that disable itself progressively until reset.
 */
export declare class CountdownButtonComponent implements OnDestroy, OnInit {
    /**
     * The text of button when it is clickable.
     */
    actionText: string;
    /**
     * Waiting text to be displayed when it is not clickable.
     */
    waitText: string;
    /**
     * Wait time to button being clickable again, in seconds.
     * @default 5
     */
    waitTime: number;
    /**
     * Output event to click in button when it is clickable.
     */
    buttonClick: EventEmitter<void>;
    /**
     * Compound text for show in button when it is in wait phase.
     *
     * It is compoung of remaining time and the `waitText` input.
     */
    counterText: string;
    /**
     * Counter observable that hold internal logic of this component.
     */
    counter$: Observable<number>;
    /**
     * Empty constructor.
     */
    constructor();
    /**
     * Start timer on component init.
     */
    ngOnInit(): void;
    /**
     * Empty `ngOnDestroy` method required by `untilDestroyed` operator from
     * `ngx-take-until-destroy` library.
     */
    ngOnDestroy(): void;
    /**
     * Emits event for button click, disable the button and restart counter observable.
     */
    dispatchAction(): void;
    /**
     * Start the countdown timer for enable back the button again.
     *
     * To avoid memory leak, the obserable will complete on:
     * 1. component destroy life cycle event
     * 2. when counter is equal to 0
     * 3. button was clicked
     *
     * In each tick, 1s, the button label will be updated.
     */
    startTimer(): void;
}