/**
 * About:blank watchdog for managing about:blank tabs with DVD screensaver.
 *
 * Ensures there's always exactly one about:blank tab with DVD screensaver
 * when needed to prevent browser closure and provide visual feedback.
 */
import { BaseWatchdog, WatchdogConfig } from './base';
import { BrowserSession } from '../session';
import { BrowserStopEvent, BrowserStoppedEvent, TabCreatedEvent, TabClosedEvent } from '../events';
export declare class AboutBlankWatchdog extends BaseWatchdog {
    static LISTENS_TO: string[];
    static EMITS: string[];
    private stopping;
    constructor(browserSession: BrowserSession, config?: WatchdogConfig);
    onBrowserStopEvent(event: BrowserStopEvent): Promise<void>;
    onBrowserStoppedEvent(event: BrowserStoppedEvent): Promise<void>;
    onTabCreatedEvent(event: TabCreatedEvent): Promise<void>;
    onTabClosedEvent(event: TabClosedEvent): Promise<void>;
    /**
     * Check current tabs and ensure exactly one about:blank tab with animation exists
     */
    private checkAndEnsureAboutBlankTab;
    /**
     * Show DVD screensaver on all about:blank pages only
     */
    private showDVDScreensaverOnAboutBlankTabs;
}
//# sourceMappingURL=aboutblank.d.ts.map