/**
 * engine.ts — The heart of universal-pwa.
 *
 * This class is completely framework-agnostic. It:
 *   1. Detects the current platform
 *   2. Listens for the browser's `beforeinstallprompt` event
 *   3. Checks stored user preferences
 *   4. Exposes a simple async install() method
 *   5. Emits events so any UI layer can react
 *
 * It has zero DOM manipulation — all UI is the responsibility of the
 * layer above (UIComponent or the developer's own code).
 */
import { EventEmitter, type EngineEvents } from './events';
import type { UniversalPWAConfig, InstallStatus } from '../types';
export declare class InstallEngine extends EventEmitter<EngineEvents> {
    private config;
    private state;
    private _readyResolve;
    readonly ready: Promise<void>;
    constructor(config?: UniversalPWAConfig);
    private _init;
    private _setStatus;
    /**
     * Programmatically trigger the install flow.
     *
     * On Chrome/Android/Desktop: calls the deferred browser prompt.
     * On iOS: this is a no-op — the UI layer should show manual instructions.
     * Returns the user's outcome: 'accepted' | 'dismissed' | 'ios' | 'unsupported'
     */
    install(): Promise<'accepted' | 'dismissed' | 'ios' | 'unsupported'>;
    /**
     * Record that the user dismissed the prompt and emit the event.
     */
    dismiss(): void;
    /**
     * Resets all stored state. Useful for dev/testing.
     */
    reset(): void;
    get status(): InstallStatus;
    get platform(): import("..").Platform;
    get isInstallable(): boolean;
    get isInstalled(): boolean;
}