import { ReactiveController, ReactiveControllerHost } from 'lit';
export declare class PwaUpdateController implements ReactiveController {
    private _host;
    private _unsubscribe?;
    constructor(host: ReactiveControllerHost);
    /** True when a new version is installed and waiting to take over. */
    get updateAvailable(): boolean;
    /** True between `apply()` and the reload it triggers. */
    get applying(): boolean;
    /**
     * Activate the waiting worker; the page reloads once it has taken over.
     * @returns `false` when there is nothing to apply.
     */
    apply(): boolean;
    /** Ask the browser to check for a new service worker now. */
    check(): Promise<void>;
    hostConnected(): void;
    hostDisconnected(): void;
}
//# sourceMappingURL=PwaUpdateController.d.ts.map