import { InstallOutcome, InstallPlatform } from './types.js';
declare class PwaInstallServiceImpl {
    private _listeners;
    private _deferredPrompt?;
    private _installed;
    private _active;
    constructor();
    /**
     * Attach the window listeners. Idempotent and SSR-safe. Called from the
     * constructor and again from `startInit` to guarantee the listeners are in
     * place early enough to catch `beforeinstallprompt` (which fires once, early),
     * even if no component has imported the service yet.
     */
    activate(): void;
    /** True when a deferred install prompt is available and not yet installed. */
    get canInstall(): boolean;
    /** True once the app has been installed (this session) or runs standalone. */
    get installed(): boolean;
    /**
     * True when the browser has an install-prompt concept at all
     * ("onbeforeinstallprompt", Chromium). Lets consumers distinguish
     * "prompt not (yet) available" from "browser cannot install"
     * (e.g. desktop Firefox). iOS installs via the Share sheet instead —
     * check isIOS separately.
     */
    get isSupported(): boolean;
    /** True when the app is running in a standalone/installed display mode. */
    get isStandalone(): boolean;
    /**
     * True on iOS Safari, where there is no programmatic install prompt and the
     * user must add the app via the Share sheet ("Add to Home Screen").
     */
    get isIOS(): boolean;
    /** How the app can be installed in the current context. */
    get platform(): InstallPlatform;
    /**
     * Trigger the native install prompt. Resolves with the user's choice, or
     * `"unavailable"` when no deferred prompt exists (e.g. iOS or already
     * installed). A deferred prompt can only be used once.
     */
    promptInstall(): Promise<InstallOutcome>;
    /**
     * Subscribe to installability changes (prompt captured, installed, consumed).
     * @returns Unsubscribe function.
     */
    subscribe(callback: () => void): () => void;
    private _handleBeforeInstallPrompt;
    private _handleAppInstalled;
    private _notifyListeners;
}
/** Singleton instance of the PWA install service. */
export declare const pwaInstallService: PwaInstallServiceImpl;
export {};
//# sourceMappingURL=PwaInstallService.d.ts.map