import { BeforeInstallPromptEvent } from './BeforeInstallPromptEvent';
type CanInstallCallback = (canInstall: boolean, install?: () => Promise<boolean>) => void;
declare class PwaInstallHandler {
    private event;
    private callbacks;
    constructor();
    /**
     * Triggers install prompt.
     */
    install: () => Promise<boolean>;
    /**
     * Returns internal `BeforeInstallPromptEvent`.
     */
    getEvent(): BeforeInstallPromptEvent;
    /**
     * Tells whether the app is ready to be installed.
     */
    canInstall(): boolean;
    private updateEvent;
    /**
     * Adds listener with a callback which is called when installability state changes.
     */
    addListener(callback: CanInstallCallback): void;
    /**
     * Removes listener.
     */
    removeListener(callback: CanInstallCallback): void;
}
export declare const pwaInstallHandler: PwaInstallHandler;
export {};