import { Event, Emitter } from '../../common';
import { CorePreferences } from '../core-preferences';
import { ContributionProvider } from '../../common/contribution-provider';
import { FrontendApplicationContribution, OnWillStopAction } from '../frontend-application-contribution';
import { WindowService } from './window-service';
import { StopReason } from '../../common/frontend-application-state';
import { FrontendApplication } from '../frontend-application';
export declare class DefaultWindowService implements WindowService, FrontendApplicationContribution {
    protected frontendApplication: FrontendApplication;
    protected allowVetoes: boolean;
    protected onUnloadEmitter: Emitter<void>;
    get onUnload(): Event<void>;
    protected readonly corePreferences: CorePreferences;
    protected readonly contributions: ContributionProvider<FrontendApplicationContribution>;
    onStart(app: FrontendApplication): void;
    openNewWindow(url: string): undefined;
    openNewDefaultWindow(): void;
    /**
     * Returns a list of actions that {@link FrontendApplicationContribution}s would like to take before shutdown
     * It is expected that this will succeed - i.e. return an empty array - at most once per session. If no vetoes are received
     * during any cycle, no further checks will be made. In that case, shutdown should proceed unconditionally.
     */
    protected collectContributionUnloadVetoes(): OnWillStopAction[];
    /**
     * Implement the mechanism to detect unloading of the page.
     */
    protected registerUnloadListeners(): void;
    isSafeToShutDown(stopReason: StopReason): Promise<boolean>;
    setSafeToShutDown(): void;
    /**
     * Called when the `window` is about to `unload` its resources.
     * At this point, the `document` is still visible and the [`BeforeUnloadEvent`](https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event)
     * event will be canceled if the return value of this method is `false`.
     *
     * In Electron, handleCloseRequestEvent is is run instead.
     */
    protected handleBeforeUnloadEvent(event: BeforeUnloadEvent): string | void;
    /**
     * Notify the browser that we do not want to unload.
     *
     * Notes:
     *  - Shows a confirmation popup in browsers.
     *  - Prevents the window from closing without confirmation in electron.
     *
     * @param event The beforeunload event
     */
    protected preventUnload(event: BeforeUnloadEvent): string | void;
    reload(): void;
}
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