/**
 * platform.ts — Detects the current browser/OS environment.
 * No dependencies. Works in any JS runtime that has a `navigator` global.
 */
import type { Platform } from '../types';
/**
 * Detects the current platform so the engine can apply the correct
 * install strategy.
 */
export declare function detectPlatform(): Platform;
/**
 * Returns true if the app is already running in installed/standalone mode.
 * This covers Android (display-mode) and iOS (navigator.standalone).
 */
export declare function isAlreadyInstalled(): boolean;