{"version":3,"file":"network-performance.mjs","sources":["../../../src/lib/performance/network-performance.ts"],"sourcesContent":["/**\n * @file Network Performance Module\n * @description Comprehensive network performance analysis and optimization with:\n * - Request timing analysis (DNS, TCP, TLS, TTFB, download)\n * - Bandwidth detection and estimation\n * - Request prioritization hints\n * - Connection quality metrics\n * - Adaptive loading strategies\n *\n * This module provides deep insights into network performance and enables\n * intelligent adaptation based on network conditions.\n *\n * @example\n * ```typescript\n * import { NetworkPerformanceAnalyzer, getNetworkQuality } from '@/lib/performance';\n *\n * const analyzer = NetworkPerformanceAnalyzer.getInstance();\n *\n * // Get current network quality\n * const quality = analyzer.getQuality();\n * if (quality.effectiveType === 'slow-2g') {\n * // Load low-quality images\n * }\n *\n * // Analyze a specific request\n * const timing = analyzer.analyzeRequest('https://api.example.com/data');\n * console.info(`TTFB: ${timing.ttfb}ms, Download: ${timing.downloadTime}ms`);\n * ```\n */\n\nimport { formatBytes, formatDuration, getNetworkTier, type NetworkTierConfig, } from '../../config/performance.config';\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/**\n * Network connection type\n */\nexport type ConnectionType =\n | 'bluetooth'\n | 'cellular'\n | 'ethernet'\n | 'wifi'\n | 'wimax'\n | 'other'\n | 'none'\n | 'unknown';\n\n/**\n * Effective connection type (Network Information API)\n */\nexport type EffectiveConnectionType = 'slow-2g' | '2g' | '3g' | '4g';\n\n/**\n * Request timing breakdown\n */\nexport interface RequestTiming {\n readonly name: string;\n readonly url: string;\n readonly startTime: number;\n readonly duration: number;\n /** DNS lookup time */\n readonly dnsLookup: number;\n /** TCP connection time */\n readonly tcpConnect: number;\n /** TLS negotiation time (HTTPS only) */\n readonly tlsNegotiation: number;\n /** Time to first byte */\n readonly ttfb: number;\n /** Content download time */\n readonly downloadTime: number;\n /** Transfer size in bytes */\n readonly transferSize: number;\n /** Encoded body size */\n readonly encodedBodySize: number;\n /** Decoded body size */\n readonly decodedBodySize: number;\n /** Resource type */\n readonly initiatorType: string;\n /** Effective bandwidth during this request (bytes/sec) */\n readonly effectiveBandwidth: number;\n /** Server timing entries */\n readonly serverTiming: ServerTimingEntry[];\n /** Timestamp */\n readonly timestamp: number;\n}\n\n/**\n * Server timing entry\n */\nexport interface ServerTimingEntry {\n readonly name: string;\n readonly duration: number;\n readonly description: string;\n}\n\n/**\n * Network quality metrics\n */\nexport interface NetworkQuality {\n /** Effective connection type */\n readonly effectiveType: EffectiveConnectionType;\n /** Estimated downlink speed in Mbps */\n readonly downlink: number;\n /** Estimated round-trip time in ms */\n readonly rtt: number;\n /** Data saver enabled */\n readonly saveData: boolean;\n /** Connection type */\n readonly type: ConnectionType;\n /** Network tier configuration */\n readonly tier: NetworkTierConfig;\n /** Overall quality score (0-100) */\n readonly score: number;\n /** Is connection metered */\n readonly isMetered: boolean;\n /** Timestamp */\n readonly timestamp: number;\n}\n\n/**\n * Bandwidth measurement\n */\nexport interface BandwidthMeasurement {\n readonly timestamp: number;\n /** Estimated bandwidth in bytes/sec */\n readonly bandwidth: number;\n /** Number of samples used */\n readonly sampleCount: number;\n /** Confidence level (0-1) */\n readonly confidence: number;\n /** Trend direction */\n readonly trend: 'improving' | 'stable' | 'degrading';\n}\n\n/**\n * Request priority hint\n */\nexport type RequestPriority = 'highest' | 'high' | 'normal' | 'low' | 'lowest';\n\n/**\n * Priority recommendation\n */\nexport interface PriorityRecommendation {\n readonly url: string;\n readonly resourceType: string;\n readonly recommendedPriority: RequestPriority;\n readonly reason: string;\n readonly fetchPriority?: 'high' | 'low' | 'auto';\n readonly shouldPreload: boolean;\n readonly shouldPreconnect: boolean;\n readonly shouldDefer: boolean;\n}\n\n/**\n * Network statistics\n */\nexport interface NetworkStats {\n readonly totalRequests: number;\n readonly totalTransferSize: number;\n readonly averageTtfb: number;\n readonly averageDownloadTime: number;\n readonly averageBandwidth: number;\n readonly p50Ttfb: number;\n readonly p95Ttfb: number;\n readonly slowRequests: number;\n readonly failedRequests: number;\n readonly requestsByType: Record;\n readonly sizeByType: Record;\n}\n\n/**\n * Analyzer configuration\n */\nexport interface NetworkAnalyzerConfig {\n /** Slow request threshold (ms) */\n readonly slowThreshold?: number;\n /** Maximum request history */\n readonly maxHistorySize?: number;\n /** Enable auto-monitoring */\n readonly autoMonitor?: boolean;\n /** Bandwidth measurement interval (ms) */\n readonly bandwidthInterval?: number;\n /** Callback on slow request */\n readonly onSlowRequest?: (timing: RequestTiming) => void;\n /** Callback on network quality change */\n readonly onQualityChange?: (quality: NetworkQuality) => void;\n /** Enable debug logging */\n readonly debug?: boolean;\n}\n\n// ============================================================================\n// Constants\n// ============================================================================\n\nconst DEFAULT_CONFIG: Required = {\n slowThreshold: 1000,\n maxHistorySize: 500,\n autoMonitor: true,\n bandwidthInterval: 10000,\n onSlowRequest: () => {},\n onQualityChange: () => {},\n debug: false,\n};\n\n/**\n * Resource type priorities\n */\nconst RESOURCE_PRIORITIES: Record = {\n document: 'highest',\n script: 'high',\n css: 'high',\n font: 'high',\n img: 'normal',\n fetch: 'normal',\n xmlhttprequest: 'normal',\n media: 'low',\n video: 'low',\n audio: 'low',\n beacon: 'lowest',\n other: 'low',\n};\n\n// ============================================================================\n// Utility Functions\n// ============================================================================\n\n/**\n * Get navigator connection object\n */\nfunction getNavigatorConnection(): {\n effectiveType?: EffectiveConnectionType;\n downlink?: number;\n rtt?: number;\n saveData?: boolean;\n type?: ConnectionType;\n addEventListener?: (type: string, listener: () => void) => void;\n removeEventListener?: (type: string, listener: () => void) => void;\n} | null {\n const nav = navigator as Navigator & {\n connection?: {\n effectiveType?: EffectiveConnectionType;\n downlink?: number;\n rtt?: number;\n saveData?: boolean;\n type?: ConnectionType;\n addEventListener?: (type: string, listener: () => void) => void;\n removeEventListener?: (type: string, listener: () => void) => void;\n };\n mozConnection?: typeof nav.connection;\n webkitConnection?: typeof nav.connection;\n };\n\n return nav.connection ?? nav.mozConnection ?? nav.webkitConnection ?? null;\n}\n\n/**\n * Calculate percentile from sorted array\n */\nfunction percentile(sortedArr: number[], p: number): number {\n if (sortedArr.length === 0) return 0;\n const index = Math.ceil((p / 100) * sortedArr.length) - 1;\n return sortedArr[Math.max(0, Math.min(index, sortedArr.length - 1))] ?? 0;\n}\n\n/**\n * Generate unique ID\n */\n\n\n// ============================================================================\n// Network Performance Analyzer\n// ============================================================================\n\n/**\n * Comprehensive network performance analyzer\n */\nexport class NetworkPerformanceAnalyzer {\n private static instance: NetworkPerformanceAnalyzer | null = null;\n\n private readonly config: Required;\n private readonly requestHistory: RequestTiming[] = [];\n private readonly bandwidthHistory: BandwidthMeasurement[] = [];\n\n private resourceObserver: PerformanceObserver | null = null;\n private bandwidthIntervalId: ReturnType | null = null;\n private lastQuality: NetworkQuality | null = null;\n private connectionChangeHandler: (() => void) | null = null;\n\n /**\n * Private constructor for singleton pattern\n */\n private constructor(config: NetworkAnalyzerConfig = {}) {\n this.config = { ...DEFAULT_CONFIG, ...config };\n\n if (this.config.autoMonitor) {\n this.startMonitoring();\n }\n }\n\n /**\n * Get singleton instance\n */\n public static getInstance(config?: NetworkAnalyzerConfig): NetworkPerformanceAnalyzer {\n NetworkPerformanceAnalyzer.instance ??= new NetworkPerformanceAnalyzer(config);\n return NetworkPerformanceAnalyzer.instance;\n }\n\n /**\n * Reset singleton instance (for testing)\n */\n public static resetInstance(): void {\n if (NetworkPerformanceAnalyzer.instance !== null) {\n NetworkPerformanceAnalyzer.instance.stopMonitoring();\n NetworkPerformanceAnalyzer.instance = null;\n }\n }\n\n // ==========================================================================\n // Monitoring Control\n // ==========================================================================\n\n /**\n * Start monitoring network performance\n */\n public startMonitoring(): void {\n this.startResourceObserver();\n this.startBandwidthMeasurement();\n this.startConnectionListener();\n this.log('Network monitoring started');\n }\n\n /**\n * Stop monitoring\n */\n public stopMonitoring(): void {\n this.stopResourceObserver();\n this.stopBandwidthMeasurement();\n this.stopConnectionListener();\n this.log('Network monitoring stopped');\n }\n\n /**\n * Analyze a specific request by URL\n */\n public analyzeRequest(url: string): RequestTiming | null {\n const entries = performance.getEntriesByName(url, 'resource') as PerformanceResourceTiming[];\n if (entries.length === 0) return null;\n\n // Get the most recent entry\n const entry = entries[entries.length - 1];\n if (entry === undefined) return null;\n return this.processResourceEntry(entry);\n }\n\n /**\n * Analyze all requests matching a pattern\n */\n public analyzeRequestsMatching(pattern: RegExp): RequestTiming[] {\n const entries = performance.getEntriesByType('resource');\n return entries\n .filter((e) => pattern.test(e.name))\n .map((e) => this.processResourceEntry(e))\n .filter((t): t is RequestTiming => t !== null);\n }\n\n /**\n * Get current network quality\n */\n public getQuality(): NetworkQuality {\n const connection = getNavigatorConnection();\n\n const effectiveType: EffectiveConnectionType = connection?.effectiveType ?? '4g';\n const downlink = connection?.downlink ?? 10;\n const rtt = connection?.rtt ?? 50;\n const saveData = connection?.saveData ?? false;\n const type: ConnectionType = connection?.type ?? 'unknown';\n\n // Get tier configuration\n const tier = getNetworkTier(rtt, downlink);\n\n // Calculate quality score (0-100)\n const rttScore = Math.max(0, 100 - (rtt / 10));\n const downlinkScore = Math.min(100, downlink * 10);\n const score = Math.round((rttScore + downlinkScore) / 2);\n\n // Determine if metered\n const isMetered = type === 'cellular' || saveData;\n\n return {\n effectiveType,\n downlink,\n rtt,\n saveData,\n type,\n tier,\n score,\n isMetered,\n timestamp: Date.now(),\n };\n }\n\n /**\n * Get quality-based loading strategy\n */\n public getLoadingStrategy(): {\n imageQuality: 'high' | 'medium' | 'low' | 'placeholder';\n prefetchStrategy: 'aggressive' | 'moderate' | 'conservative' | 'none';\n shouldReduceMotion: boolean;\n shouldDeferNonCritical: boolean;\n maxConcurrentRequests: number;\n } {\n const quality = this.getQuality();\n\n return {\n imageQuality: quality.tier.imageQuality,\n prefetchStrategy: quality.tier.prefetchStrategy,\n shouldReduceMotion: quality.score < 50 || quality.saveData,\n shouldDeferNonCritical: quality.score < 30,\n maxConcurrentRequests: (() => {\n if (quality.score >= 70) return 6;\n if (quality.score >= 40) return 4;\n return 2;\n })(),\n };\n }\n\n /**\n * Measure current bandwidth from recent requests\n */\n public measureBandwidth(): BandwidthMeasurement | null {\n const recentRequests = this.requestHistory\n .filter((r) => Date.now() - r.timestamp < 60000) // Last minute\n .filter((r) => r.transferSize > 0 && r.downloadTime > 0);\n\n if (recentRequests.length === 0) return null;\n\n // Calculate weighted bandwidth (larger transfers are more accurate)\n let totalWeight = 0;\n let weightedBandwidth = 0;\n\n recentRequests.forEach((r) => {\n const weight = Math.log(r.transferSize + 1);\n weightedBandwidth += r.effectiveBandwidth * weight;\n totalWeight += weight;\n });\n\n const bandwidth = totalWeight > 0 ? weightedBandwidth / totalWeight : 0;\n\n // Calculate trend\n const trend = this.calculateBandwidthTrend();\n\n // Calculate confidence based on sample count and variability\n const confidence = Math.min(1, recentRequests.length / 10);\n\n return {\n timestamp: Date.now(),\n bandwidth,\n sampleCount: recentRequests.length,\n confidence,\n trend,\n };\n }\n\n /**\n * Get estimated bandwidth\n */\n public getEstimatedBandwidth(): number {\n const measurement = this.measureBandwidth();\n if (measurement !== null && measurement.confidence > 0.5) {\n return measurement.bandwidth;\n }\n\n // Fall back to Network Information API\n const connection = getNavigatorConnection();\n return ((connection?.downlink ?? 10) * 1024 * 1024) / 8; // Convert Mbps to bytes/sec\n }\n\n /**\n * Get priority recommendation for a resource\n */\n public getPriorityRecommendation(\n url: string,\n resourceType: string,\n options: {\n isAboveFold?: boolean;\n isLCP?: boolean;\n isInteractive?: boolean;\n } = {}\n ): PriorityRecommendation {\n const quality = this.getQuality();\n\n\n let recommendedPriority: RequestPriority = RESOURCE_PRIORITIES[resourceType] ?? 'normal';\n let fetchPriority: 'high' | 'low' | 'auto' = 'auto';\n let shouldPreload = false;\n let shouldPreconnect = false;\n let shouldDefer = false;\n let reason = 'Standard priority for resource type';\n\n // Boost priority for critical resources\n if (options.isLCP === true) {\n recommendedPriority = 'highest';\n fetchPriority = 'high';\n shouldPreload = true;\n reason = 'LCP candidate - highest priority';\n } else if (options.isAboveFold === true && resourceType === 'img') {\n recommendedPriority = 'high';\n fetchPriority = 'high';\n shouldPreload = true;\n reason = 'Above-fold image - preload recommended';\n } else if (options.isInteractive === true) {\n recommendedPriority = 'high';\n reason = 'Interactive element - high priority';\n }\n\n // Reduce priority on slow connections\n if (quality.score < 30) {\n if (options.isLCP !== true && options.isAboveFold !== true) {\n recommendedPriority = 'low';\n fetchPriority = 'low';\n shouldDefer = true;\n reason = 'Slow connection - defer non-critical resources';\n }\n }\n\n // Check if preconnect would help\n try {\n const urlObj = new URL(url);\n const {origin} = urlObj;\n const isCrossOrigin = origin !== window.location.origin;\n if (isCrossOrigin && (recommendedPriority === 'highest' || recommendedPriority === 'high')) {\n shouldPreconnect = true;\n }\n } catch {\n // Invalid URL, skip preconnect recommendation\n }\n\n return {\n url,\n resourceType,\n recommendedPriority,\n reason,\n fetchPriority,\n shouldPreload,\n shouldPreconnect,\n shouldDefer,\n };\n }\n\n // ==========================================================================\n // Request Analysis\n // ==========================================================================\n\n /**\n * Get network statistics\n */\n public getStats(): NetworkStats {\n const requests = this.requestHistory;\n\n if (requests.length === 0) {\n return {\n totalRequests: 0,\n totalTransferSize: 0,\n averageTtfb: 0,\n averageDownloadTime: 0,\n averageBandwidth: 0,\n p50Ttfb: 0,\n p95Ttfb: 0,\n slowRequests: 0,\n failedRequests: 0,\n requestsByType: {},\n sizeByType: {},\n };\n }\n\n const ttfbs = requests.map((r) => r.ttfb).sort((a, b) => a - b);\n const totalSize = requests.reduce((s, r) => s + r.transferSize, 0);\n const totalTtfb = ttfbs.reduce((s, t) => s + t, 0);\n const totalDownload = requests.reduce((s, r) => s + r.downloadTime, 0);\n const totalBandwidth = requests.reduce((s, r) => s + r.effectiveBandwidth, 0);\n const slowCount = requests.filter((r) => r.ttfb > this.config.slowThreshold).length;\n\n const requestsByType: Record = {};\n const sizeByType: Record = {};\n\n requests.forEach((r) => {\n const type = r.initiatorType ?? 'other';\n requestsByType[type] = (requestsByType[type] ?? 0) + 1;\n sizeByType[type] = (sizeByType[type] ?? 0) + r.transferSize;\n });\n\n return {\n totalRequests: requests.length,\n totalTransferSize: totalSize,\n averageTtfb: totalTtfb / requests.length,\n averageDownloadTime: totalDownload / requests.length,\n averageBandwidth: totalBandwidth / requests.length,\n p50Ttfb: percentile(ttfbs, 50),\n p95Ttfb: percentile(ttfbs, 95),\n slowRequests: slowCount,\n failedRequests: 0, // Resource timing doesn't capture failures\n requestsByType,\n sizeByType,\n };\n }\n\n /**\n * Get request history\n */\n public getHistory(): RequestTiming[] {\n return [...this.requestHistory];\n }\n\n /**\n * Get slow requests\n */\n public getSlowRequests(): RequestTiming[] {\n return this.requestHistory.filter((r) => r.ttfb > this.config.slowThreshold);\n }\n\n // ==========================================================================\n // Network Quality\n // ==========================================================================\n\n /**\n * Clear history\n */\n public clearHistory(): void {\n this.requestHistory.length = 0;\n this.bandwidthHistory.length = 0;\n this.log('History cleared');\n }\n\n /**\n * Generate network performance report\n */\n public generateReport(): string {\n const stats = this.getStats();\n const quality = this.getQuality();\n const bandwidth = this.measureBandwidth();\n const slowRequests = this.getSlowRequests();\n\n const lines = [\n '='.repeat(60),\n 'NETWORK PERFORMANCE REPORT',\n '='.repeat(60),\n '',\n `Generated: ${new Date().toISOString()}`,\n '',\n '--- Network Quality ---',\n `Effective Type: ${quality.effectiveType}`,\n `RTT: ${quality.rtt}ms`,\n `Downlink: ${quality.downlink} Mbps`,\n `Quality Score: ${quality.score}/100`,\n `Data Saver: ${quality.saveData ? 'Enabled' : 'Disabled'}`,\n '',\n '--- Bandwidth ---',\n `Estimated: ${bandwidth !== null ? `${formatBytes(bandwidth.bandwidth) }/s` : 'N/A'}`,\n `Confidence: ${bandwidth !== null ? `${(bandwidth.confidence * 100).toFixed(0) }%` : 'N/A'}`,\n `Trend: ${bandwidth?.trend ?? 'N/A'}`,\n '',\n '--- Request Statistics ---',\n `Total Requests: ${stats.totalRequests}`,\n `Total Transfer: ${formatBytes(stats.totalTransferSize)}`,\n `Average TTFB: ${formatDuration(stats.averageTtfb)}`,\n `P50 TTFB: ${formatDuration(stats.p50Ttfb)}`,\n `P95 TTFB: ${formatDuration(stats.p95Ttfb)}`,\n `Slow Requests: ${stats.slowRequests}`,\n '',\n '--- Requests by Type ---',\n ];\n\n Object.entries(stats.requestsByType)\n .sort(([, a], [, b]) => b - a)\n .forEach(([type, count]) => {\n const size = stats.sizeByType[type] ?? 0;\n lines.push(` ${type}: ${count} requests, ${formatBytes(size)}`);\n });\n\n if (slowRequests.length > 0) {\n lines.push('');\n lines.push('--- Slow Requests (Top 5) ---');\n slowRequests.slice(0, 5).forEach((r) => {\n lines.push(` - ${r.name}: TTFB ${formatDuration(r.ttfb)}`);\n });\n }\n\n lines.push('');\n lines.push('='.repeat(60));\n\n return lines.join('\\n');\n }\n\n // ==========================================================================\n // Bandwidth Measurement\n // ==========================================================================\n\n /**\n * Start resource timing observer\n */\n private startResourceObserver(): void {\n if (typeof PerformanceObserver === 'undefined') return;\n\n try {\n this.resourceObserver = new PerformanceObserver((list) => {\n const entries = list.getEntries() as PerformanceResourceTiming[];\n entries.forEach((entry) => {\n const timing = this.processResourceEntry(entry);\n if (timing !== null) {\n this.requestHistory.push(timing);\n this.trimHistory();\n\n if (timing.ttfb > this.config.slowThreshold) {\n this.config.onSlowRequest(timing);\n this.log(`Slow request: ${timing.url} (TTFB: ${formatDuration(timing.ttfb)})`);\n }\n }\n });\n });\n\n this.resourceObserver.observe({ entryTypes: ['resource'] });\n } catch (error) {\n this.log('Failed to start resource observer:', error);\n }\n }\n\n /**\n * Stop resource observer\n */\n private stopResourceObserver(): void {\n if (this.resourceObserver !== null) {\n this.resourceObserver.disconnect();\n this.resourceObserver = null;\n }\n }\n\n /**\n * Start bandwidth measurement\n */\n private startBandwidthMeasurement(): void {\n this.bandwidthIntervalId = setInterval(() => {\n const measurement = this.measureBandwidth();\n if (measurement !== null) {\n this.bandwidthHistory.push(measurement);\n if (this.bandwidthHistory.length > 100) {\n this.bandwidthHistory.shift();\n }\n }\n }, this.config.bandwidthInterval);\n }\n\n // ==========================================================================\n // Priority Recommendations\n // ==========================================================================\n\n /**\n * Stop bandwidth measurement\n */\n private stopBandwidthMeasurement(): void {\n if (this.bandwidthIntervalId !== null) {\n clearInterval(this.bandwidthIntervalId);\n this.bandwidthIntervalId = null;\n }\n }\n\n // ==========================================================================\n // Statistics\n // ==========================================================================\n\n /**\n * Start connection change listener\n */\n private startConnectionListener(): void {\n const connection = getNavigatorConnection();\n if (connection?.addEventListener === undefined || connection?.addEventListener === null) return;\n\n this.connectionChangeHandler = () => {\n const quality = this.getQuality();\n if (this.hasQualityChanged(quality)) {\n this.config.onQualityChange(quality);\n this.lastQuality = quality;\n this.log('Network quality changed:', quality.effectiveType);\n }\n };\n\n connection.addEventListener('change', this.connectionChangeHandler);\n }\n\n /**\n * Stop connection listener\n */\n private stopConnectionListener(): void {\n if (this.connectionChangeHandler === null) return;\n\n const connection = getNavigatorConnection();\n if (connection?.removeEventListener !== undefined && connection?.removeEventListener !== null) {\n connection.removeEventListener('change', this.connectionChangeHandler);\n }\n this.connectionChangeHandler = null;\n }\n\n /**\n * Check if network quality has changed significantly\n */\n private hasQualityChanged(newQuality: NetworkQuality): boolean {\n if (this.lastQuality === null) return true;\n return newQuality.effectiveType !== this.lastQuality.effectiveType ||\n Math.abs(newQuality.score - this.lastQuality.score) > 10;\n }\n\n /**\n * Process a resource timing entry\n */\n private processResourceEntry(entry: PerformanceResourceTiming): RequestTiming | null {\n // Skip entries with no timing data\n if (entry.duration === 0) return null;\n\n const dnsLookup = entry.domainLookupEnd - entry.domainLookupStart;\n const tcpConnect = entry.connectEnd - entry.connectStart;\n const tlsNegotiation = entry.secureConnectionStart > 0\n ? entry.connectEnd - entry.secureConnectionStart\n : 0;\n const ttfb = entry.responseStart - entry.requestStart;\n const downloadTime = entry.responseEnd - entry.responseStart;\n\n // Calculate effective bandwidth\n const effectiveBandwidth = downloadTime > 0\n ? (entry.transferSize / downloadTime) * 1000\n : 0;\n\n // Extract server timing\n const serverTiming: ServerTimingEntry[] = [];\n if ('serverTiming' in entry && Array.isArray(entry.serverTiming)) {\n entry.serverTiming.forEach((st: { name: string; duration: number; description: string }) => {\n serverTiming.push({\n name: st.name,\n duration: st.duration,\n description: st.description,\n });\n });\n }\n\n return {\n name: entry.name.split('/').pop() ?? entry.name,\n url: entry.name,\n startTime: entry.startTime,\n duration: entry.duration,\n dnsLookup: Math.max(0, dnsLookup),\n tcpConnect: Math.max(0, tcpConnect),\n tlsNegotiation: Math.max(0, tlsNegotiation),\n ttfb: Math.max(0, ttfb),\n downloadTime: Math.max(0, downloadTime),\n transferSize: entry.transferSize,\n encodedBodySize: entry.encodedBodySize,\n decodedBodySize: entry.decodedBodySize,\n initiatorType: entry.initiatorType,\n effectiveBandwidth,\n serverTiming,\n timestamp: Date.now(),\n };\n }\n\n // ==========================================================================\n // Reporting\n // ==========================================================================\n\n /**\n * Calculate bandwidth trend\n */\n private calculateBandwidthTrend(): 'improving' | 'stable' | 'degrading' {\n if (this.bandwidthHistory.length < 2) return 'stable';\n\n const recent = this.bandwidthHistory.slice(-5);\n const older = this.bandwidthHistory.slice(-10, -5);\n\n if (older.length === 0) return 'stable';\n\n const recentAvg = recent.reduce((s, m) => s + m.bandwidth, 0) / recent.length;\n const olderAvg = older.reduce((s, m) => s + m.bandwidth, 0) / older.length;\n\n const change = ((recentAvg - olderAvg) / olderAvg) * 100;\n\n if (change > 10) return 'improving';\n if (change < -10) return 'degrading';\n return 'stable';\n }\n\n // ==========================================================================\n // Utilities\n // ==========================================================================\n\n /**\n * Trim history to max size\n */\n private trimHistory(): void {\n if (this.requestHistory.length > this.config.maxHistorySize) {\n this.requestHistory.splice(0, this.requestHistory.length - this.config.maxHistorySize);\n }\n }\n\n /**\n * Debug logging\n */\n private log(message: string, ...args: unknown[]): void {\n if (this.config.debug) {\n console.info(`[NetworkAnalyzer] ${message}`, ...args);\n }\n }\n}\n\n// ============================================================================\n// Convenience Functions\n// ============================================================================\n\n/**\n * Get the singleton NetworkPerformanceAnalyzer instance\n */\nexport function getNetworkAnalyzer(\n config?: NetworkAnalyzerConfig\n): NetworkPerformanceAnalyzer {\n return NetworkPerformanceAnalyzer.getInstance(config);\n}\n\n/**\n * Get current network quality (convenience function)\n */\nexport function getNetworkQuality(): NetworkQuality {\n return getNetworkAnalyzer().getQuality();\n}\n\n/**\n * Check if on slow connection\n */\nexport function isSlowConnection(): boolean {\n const quality = getNetworkQuality();\n return quality.score < 50 || quality.effectiveType === 'slow-2g' || quality.effectiveType === '2g';\n}\n\n/**\n * Check if data saver is enabled\n */\nexport function isDataSaverEnabled(): boolean {\n return getNetworkQuality().saveData;\n}\n\n/**\n * Get loading strategy based on network\n */\nexport function getAdaptiveLoadingStrategy(): ReturnType {\n return getNetworkAnalyzer().getLoadingStrategy();\n}\n\n// ============================================================================\n// Exports\n// 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