/**
 * Device performance metrics interface
 */
export interface DeviceMetrics {
    totalMemory: number;
    availableMemory: number;
    cpuCores: number;
    isLowEnd: boolean;
    batteryLevel?: number;
    isCharging?: boolean;
    thermalState?: 'nominal' | 'fair' | 'serious' | 'critical';
    deviceType?: 'phone' | 'tablet' | 'tv' | 'unknown';
}
/**
 * Device capability detector and performance analyzer
 */
export declare class DeviceDetector {
    private static cachedMetrics?;
    private static lastUpdateTime?;
    private static readonly CACHE_DURATION;
    /**
     * Get comprehensive device metrics with caching
     */
    static getDeviceMetrics(): Promise<DeviceMetrics>;
    /**
     * Get cached device metrics synchronously (returns defaults if not cached)
     */
    static getDeviceMetricsSync(): DeviceMetrics;
    /**
     * Check if device is suitable for heavy asset downloads
     */
    static canHandleHeavyDownloads(): Promise<boolean>;
    /**
     * Get optimal download concurrency based on device capabilities
     */
    static getOptimalConcurrency(): Promise<number>;
    /**
     * Check if device should use conservative download settings
     */
    static shouldUseConservativeSettings(): Promise<boolean>;
    /**
     * Invalidate cache to force fresh device metrics
     */
    static invalidateCache(): void;
    /**
     * Get device info from React Native modules
     */
    private static getReactNativeDeviceInfo;
    /**
     * Conservative device defaults for fallback
     */
    private static getConservativeDefaults;
    /**
     * Estimate CPU cores based on device info
     */
    private static estimateCpuCores;
    /**
     * Determine if device is low-end based on comprehensive metrics
     */
    private static isLowEndDevice;
    /**
     * Detect device type from available info
     */
    private static detectDeviceType;
}