/** The `beforeinstallprompt` event, dispatched when the browser offers to install the application. */
export interface BeforeInstallPromptEvent extends Event {
    readonly platforms: Array<string>;
    readonly userChoice: Promise<{
        readonly outcome: 'accepted' | 'dismissed';
        readonly platform: string;
    }>;
    prompt(): Promise<void>;
}
/** Registers service workers, and prompts to install the application as a progressive web app. */
export declare class PwaHelper {
    private static pwaPrompt?;
    /** The service worker container, if the browser supports service workers. */
    static get serviceWorkerContainer(): ServiceWorkerContainer | undefined;
    /** Registers the service worker at the path for the whole origin and prompts to install the application, logging any error. */
    static registerServiceWorker(absolutePath: string): Promise<void>;
    static unregisterServiceWorkers(): Promise<void>;
    private static requestInstallation;
}
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