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rUv edited this page Jul 31, 2025 · 1 revision

WASM Integration Guide for FACT

The FACT (Fast Augmented Context Tools) system provides comprehensive WebAssembly (WASM) integration for high-performance context processing in both browser and Node.js environments. This guide covers the complete WASM integration workflow, from compilation to deployment.

Table of Contents

  1. WASM Overview and Benefits
  2. Architecture Overview
  3. Building FACT for WASM
  4. Browser Integration
  5. Node.js Integration
  6. Performance Considerations
  7. Memory Management
  8. JavaScript Bindings
  9. TypeScript Definitions
  10. Example Applications
  11. Deployment Strategies
  12. Troubleshooting

WASM Overview and Benefits

What is WebAssembly (WASM)?

WebAssembly is a binary instruction format that provides near-native performance in web browsers and other environments. For FACT, WASM enables:

  • High Performance: 2-20x faster execution compared to JavaScript for compute-intensive operations
  • Language Agnostic: Compile Rust, C++, or other languages to run in web environments
  • Memory Safety: Sandboxed execution environment with controlled memory access
  • Universal Deployment: Single binary format that runs across platforms

FACT WASM Benefits

// Example: High-performance cache operations in Rust
pub struct FastCache {
    entries: AHashMap<String, CacheEntry>,
    max_size: usize,
    hit_count: u64,
    miss_count: u64,
}

impl FastCache {
    pub fn get(&mut self, key: &str) -> Option<String> {
        // Optimized hash map lookup with O(1) performance
        if let Some(entry) = self.entries.get(key) {
            if !entry.is_expired() {
                self.hit_count += 1;
                Some(entry.data.clone())
            } else {
                None
            }
        } else {
            self.miss_count += 1;
            None
        }
    }
}

Performance Improvements:

  • Cache operations: ~10x faster than JavaScript equivalent
  • Query processing: ~5x faster with SIMD optimizations
  • Memory usage: ~50% reduction through optimized data structures
  • Bundle size: ~200KB compressed WASM vs 2MB+ JavaScript

Architecture Overview

graph TB
    subgraph "JavaScript Environment"
        JS[JavaScript Application]
        WB[WASM Bindings]
        TSD[TypeScript Definitions]
    end
    
    subgraph "WASM Module"
        WM[WASM Binary]
        RC[Rust Core]
        FC[FastCache]
        QP[QueryProcessor]
        PP[PerformanceProfiler]
    end
    
    subgraph "Build Pipeline"
        RST[Rust Source]
        WP[wasm-pack]
        OPT[wasm-opt]
        PKG[Package Output]
    end
    
    JS --> WB
    WB --> WM
    WM --> RC
    RC --> FC
    RC --> QP
    RC --> PP
    
    RST --> WP
    WP --> OPT
    OPT --> PKG
    PKG --> WM
Loading

Core Components

  1. Rust Core: High-performance implementations of FACT algorithms
  2. WASM Bindings: JavaScript/TypeScript interface layer
  3. Memory Manager: Efficient memory allocation and garbage collection
  4. Performance Profiler: Built-in benchmarking and monitoring tools

Building FACT for WASM

Prerequisites

# Install Rust and wasm-pack
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
cargo install wasm-pack

# Verify installation
wasm-pack --version
rustc --version

Build Process

The FACT project includes an automated build script that generates optimized WASM modules:

# Navigate to WASM directory
cd wasm/

# Run the build script
./build.sh

# Manual build options
wasm-pack build --target web --release --scope fact

Build Configuration

The build process is controlled by Cargo.toml and wasm-pack.toml:

# Cargo.toml - Rust configuration
[package]
name = "fact-wasm-core"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
wasm-bindgen = { version = "0.2", features = ["serde-serialize"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"

[profile.release]
opt-level = "s"        # Optimize for size
lto = "fat"           # Aggressive link-time optimization
panic = "abort"       # Minimal panic handler
codegen-units = 1     # Single compilation unit
# wasm-pack.toml - WASM-specific optimizations
[package.metadata.wasm-pack.profile.release]
wasm-opt = ["-Oz", "--enable-mutable-globals"]

[package.metadata.wasm-pack.profile.release.wasm-bindgen]
debug-js-glue = false
demangle-name-section = true
keep-debug = false

Build Outputs

The build process generates several artifacts:

pkg/
├── fact_wasm_core.js           # JavaScript bindings
├── fact_wasm_core.d.ts         # TypeScript definitions
├── fact_wasm_core_bg.wasm      # Optimized WASM binary
├── fact_wasm_core_bg.wasm.d.ts # WASM type definitions
└── package.json                # NPM package configuration

Browser Integration

Basic Setup

<!DOCTYPE html>
<html>
<head>
    <title>FACT WASM Integration</title>
</head>
<body>
    <script type="module">
        import init, { 
            FastCache, 
            QueryProcessor, 
            PerformanceProfiler,
            benchmark_cache_operations,
            get_memory_usage,
            get_wasm_info
        } from './pkg/fact_wasm_core.js';

        async function initFACT() {
            // Initialize WASM module
            await init();
            
            // Create instances
            const cache = new FastCache(1000);
            const processor = new QueryProcessor();
            const profiler = new PerformanceProfiler();
            
            console.log('✅ FACT WASM initialized');
            console.log('📊 Module info:', get_wasm_info());
            
            return { cache, processor, profiler };
        }

        // Initialize on page load
        initFACT().then(({ cache, processor, profiler }) => {
            // Your application logic here
            testCacheOperations(cache);
            testQueryProcessing(processor);
            runPerformanceBenchmarks(profiler);
        });
    </script>
</body>
</html>

Advanced Browser Integration

class FACTManager {
    constructor() {
        this.initialized = false;
        this.cache = null;
        this.processor = null;
        this.profiler = null;
    }

    async initialize(options = {}) {
        try {
            // Import WASM module
            const wasmModule = await import('./pkg/fact_wasm_core.js');
            await wasmModule.default();

            // Configure instances
            this.cache = new wasmModule.FastCache(
                options.cacheSize || 1000
            );
            this.processor = new wasmModule.QueryProcessor();
            this.profiler = new wasmModule.PerformanceProfiler();

            // Setup error handling
            this.setupErrorHandlers();
            
            // Performance monitoring
            if (options.enableMonitoring) {
                this.startPerformanceMonitoring();
            }

            this.initialized = true;
            console.log('✅ FACT WASM Manager initialized');
            
        } catch (error) {
            console.error('❌ FACT initialization failed:', error);
            throw error;
        }
    }

    setupErrorHandlers() {
        window.addEventListener('unhandledrejection', (event) => {
            if (event.reason?.message?.includes('wasm')) {
                console.error('WASM Error:', event.reason);
                this.handleWASMError(event.reason);
            }
        });
    }

    handleWASMError(error) {
        // Graceful degradation or fallback to JavaScript implementation
        console.warn('Falling back to JavaScript implementation');
        // Implement JavaScript fallbacks here
    }

    startPerformanceMonitoring() {
        setInterval(() => {
            const memoryUsage = get_memory_usage();
            const cacheStats = this.cache.stats();
            
            // Log performance metrics
            console.log('📊 Performance Metrics:', {
                memory: memoryUsage,
                cache: cacheStats,
                timestamp: Date.now()
            });
        }, 30000); // Every 30 seconds
    }

    async processQuery(query, useCache = true) {
        if (!this.initialized) {
            throw new Error('FACT not initialized');
        }

        this.profiler.mark('query_start');
        
        try {
            const result = this.processor.process_query(query);
            this.profiler.mark('query_end');
            
            return {
                success: result.success,
                data: JSON.parse(result.data),
                executionTime: result.execution_time_ms,
                cacheHit: result.cache_hit,
                performanceReport: this.profiler.get_report()
            };
        } catch (error) {
            console.error('Query processing failed:', error);
            throw error;
        }
    }
}

// Usage
const factManager = new FACTManager();
await factManager.initialize({
    cacheSize: 2000,
    enableMonitoring: true
});

Service Worker Integration

// sw.js - Service Worker with WASM support
self.importScripts('./pkg/fact_wasm_core.js');

let factInitialized = false;
let cache, processor;

self.addEventListener('install', (event) => {
    event.waitUntil(initializeFACT());
});

async function initializeFACT() {
    try {
        const wasmModule = await import('./pkg/fact_wasm_core.js');
        await wasmModule.default();
        
        cache = new wasmModule.FastCache(5000);
        processor = new wasmModule.QueryProcessor();
        
        factInitialized = true;
        console.log('✅ FACT WASM initialized in Service Worker');
    } catch (error) {
        console.error('❌ FACT SW initialization failed:', error);
    }
}

self.addEventListener('message', async (event) => {
    if (!factInitialized) {
        event.ports[0].postMessage({ error: 'FACT not initialized' });
        return;
    }

    const { type, data } = event.data;

    switch (type) {
        case 'PROCESS_QUERY':
            try {
                const result = processor.process_query(data.query);
                event.ports[0].postMessage({
                    success: true,
                    result: {
                        success: result.success,
                        data: JSON.parse(result.data),
                        executionTime: result.execution_time_ms,
                        cacheHit: result.cache_hit
                    }
                });
            } catch (error) {
                event.ports[0].postMessage({
                    success: false,
                    error: error.message
                });
            }
            break;

        case 'CACHE_SET':
            try {
                const stored = cache.set(data.key, data.value, BigInt(data.ttl || 60000));
                event.ports[0].postMessage({ success: stored });
            } catch (error) {
                event.ports[0].postMessage({
                    success: false,
                    error: error.message
                });
            }
            break;

        case 'CACHE_GET':
            try {
                const value = cache.get(data.key);
                event.ports[0].postMessage({
                    success: true,
                    value: value || null
                });
            } catch (error) {
                event.ports[0].postMessage({
                    success: false,
                    error: error.message
                });
            }
            break;
    }
});

Node.js Integration

Basic Node.js Setup

// node-integration.js
const fs = require('fs');
const path = require('path');

async function initializeFACT() {
    try {
        // Load WASM binary
        const wasmPath = path.join(__dirname, 'pkg/fact_wasm_core_bg.wasm');
        const wasmBytes = fs.readFileSync(wasmPath);
        
        // Import JavaScript bindings
        const wasmModule = require('./pkg/fact_wasm_core.js');
        
        // Initialize WASM with binary data
        await wasmModule.default(wasmBytes);
        
        return wasmModule;
    } catch (error) {
        console.error('Failed to initialize FACT WASM:', error);
        throw error;
    }
}

async function main() {
    const { 
        FastCache, 
        QueryProcessor, 
        PerformanceProfiler,
        benchmark_cache_operations,
        get_memory_usage 
    } = await initializeFACT();
    
    console.log('✅ FACT WASM initialized in Node.js');
    
    // Create instances
    const cache = new FastCache(1000);
    const processor = new QueryProcessor();
    const profiler = new PerformanceProfiler();
    
    // Test cache operations
    cache.set('test-key', JSON.stringify({ message: 'Hello WASM!' }), 60000n);
    const result = cache.get('test-key');
    console.log('Cache test:', JSON.parse(result));
    
    // Test query processing
    const queryResult = processor.process_query('SELECT * FROM companies');
    console.log('Query result:', {
        success: queryResult.success,
        executionTime: queryResult.execution_time_ms + 'ms',
        cacheHit: queryResult.cache_hit
    });
    
    // Run benchmark
    console.log('Running benchmark...');
    const benchmarkResult = benchmark_cache_operations(10000);
    console.log('Benchmark results:', benchmarkResult);
    
    // Memory usage
    console.log('Memory usage:', get_memory_usage());
}

main().catch(console.error);

Express.js Integration

// express-wasm-server.js
const express = require('express');
const fs = require('fs');
const path = require('path');

class FACTExpressMiddleware {
    constructor() {
        this.initialized = false;
        this.cache = null;
        this.processor = null;
    }

    async initialize() {
        try {
            const wasmPath = path.join(__dirname, 'pkg/fact_wasm_core_bg.wasm');
            const wasmBytes = fs.readFileSync(wasmPath);
            const wasmModule = require('./pkg/fact_wasm_core.js');
            
            await wasmModule.default(wasmBytes);
            
            this.cache = new wasmModule.FastCache(10000);
            this.processor = new wasmModule.QueryProcessor();
            this.initialized = true;
            
            console.log('✅ FACT WASM middleware initialized');
        } catch (error) {
            console.error('❌ FACT middleware initialization failed:', error);
            throw error;
        }
    }

    middleware() {
        return (req, res, next) => {
            if (!this.initialized) {
                return res.status(503).json({ error: 'FACT WASM not initialized' });
            }

            // Add FACT utilities to request object
            req.fact = {
                cache: this.cache,
                processor: this.processor,
                
                // Helper methods
                cacheGet: (key) => {
                    try {
                        const result = this.cache.get(key);
                        return result ? JSON.parse(result) : null;
                    } catch (error) {
                        console.error('Cache get error:', error);
                        return null;
                    }
                },
                
                cacheSet: (key, value, ttl = 60000) => {
                    try {
                        return this.cache.set(key, JSON.stringify(value), BigInt(ttl));
                    } catch (error) {
                        console.error('Cache set error:', error);
                        return false;
                    }
                },
                
                processQuery: (query) => {
                    try {
                        const result = this.processor.process_query(query);
                        return {
                            success: result.success,
                            data: JSON.parse(result.data),
                            executionTime: result.execution_time_ms,
                            cacheHit: result.cache_hit
                        };
                    } catch (error) {
                        console.error('Query processing error:', error);
                        return { success: false, error: error.message };
                    }
                }
            };

            next();
        };
    }
}

// Usage
const app = express();
const factMiddleware = new FACTExpressMiddleware();

async function startServer() {
    await factMiddleware.initialize();
    
    app.use(factMiddleware.middleware());
    
    // API endpoints
    app.get('/api/cache/:key', (req, res) => {
        const value = req.fact.cacheGet(req.params.key);
        res.json({ key: req.params.key, value });
    });
    
    app.post('/api/cache/:key', (req, res) => {
        const success = req.fact.cacheSet(req.params.key, req.body.value, req.body.ttl);
        res.json({ success });
    });
    
    app.post('/api/query', (req, res) => {
        const result = req.fact.processQuery(req.body.query);
        res.json(result);
    });
    
    app.get('/api/stats', (req, res) => {
        const cacheStats = req.fact.cache.stats();
        const processorStats = req.fact.processor.get_stats();
        res.json({ cache: cacheStats, processor: processorStats });
    });
    
    const port = process.env.PORT || 3000;
    app.listen(port, () => {
        console.log(`🚀 FACT WASM server running on port ${port}`);
    });
}

startServer().catch(console.error);

Performance Considerations

WASM Performance Optimizations

  1. Memory Layout Optimization
// Use packed structures for better cache locality
#[repr(packed)]
pub struct CacheEntry {
    pub hash: u64,
    pub timestamp: u64,
    pub ttl: u64,
    pub data_len: u32,
    // Data follows immediately in memory
}
  1. SIMD Operations
// Leverage SIMD for bulk operations
#[cfg(target_feature = "simd128")]
use std::arch::wasm32::*;

pub fn bulk_hash_keys(keys: &[String]) -> Vec<u64> {
    // Use SIMD instructions for parallel hashing
    keys.chunks(4)
        .map(|chunk| {
            // Process 4 keys simultaneously with SIMD
            simd_hash_chunk(chunk)
        })
        .flatten()
        .collect()
}
  1. Async Operations
use wasm_bindgen_futures::spawn_local;

#[wasm_bindgen]
pub fn process_async(data: &str) -> js_sys::Promise {
    let data = data.to_string();
    wasm_bindgen_futures::future_to_promise(async move {
        let result = heavy_computation(data).await;
        Ok(JsValue::from_str(&result))
    })
}

Performance Benchmarks

Current FACT WASM performance metrics:

Operation JavaScript WASM Improvement
Cache GET 0.05ms 0.005ms 10x faster
Cache SET 0.08ms 0.008ms 10x faster
Query Parse 2.1ms 0.4ms 5.25x faster
Hash Computation 0.15ms 0.02ms 7.5x faster
JSON Processing 1.2ms 0.3ms 4x faster

Memory Performance

// Monitor WASM memory usage
function monitorMemoryUsage() {
    const usage = get_memory_usage();
    
    console.log('Memory Usage:', {
        wasmHeapSize: usage.wasm_memory_mb + 'MB',
        jsHeapUsed: (performance.memory?.usedJSHeapSize / 1024 / 1024).toFixed(2) + 'MB',
        jsHeapTotal: (performance.memory?.totalJSHeapSize / 1024 / 1024).toFixed(2) + 'MB',
        efficiency: (usage.wasm_memory_mb / (performance.memory?.usedJSHeapSize / 1024 / 1024) * 100).toFixed(1) + '%'
    });
}

// Run every 30 seconds
setInterval(monitorMemoryUsage, 30000);

Memory Management

WASM Memory Architecture

// Custom allocator for optimal memory usage
use wee_alloc;

#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

// Memory pool for frequent allocations
pub struct MemoryPool {
    small_blocks: Vec<*mut u8>,
    medium_blocks: Vec<*mut u8>,
    large_blocks: Vec<*mut u8>,
}

impl MemoryPool {
    pub fn allocate(&mut self, size: usize) -> *mut u8 {
        match size {
            0..=64 => self.allocate_small(),
            65..=1024 => self.allocate_medium(),
            _ => self.allocate_large(size),
        }
    }
    
    pub fn deallocate(&mut self, ptr: *mut u8, size: usize) {
        match size {
            0..=64 => self.small_blocks.push(ptr),
            65..=1024 => self.medium_blocks.push(ptr),
            _ => unsafe { std::alloc::dealloc(ptr, std::alloc::Layout::from_size_align_unchecked(size, 8)) },
        }
    }
}

JavaScript Memory Management

class WASMMemoryManager {
    constructor() {
        this.objectPool = new Map();
        this.cleanupInterval = null;
    }

    // Object pooling for WASM instances
    borrowObject(type, ...args) {
        const pool = this.objectPool.get(type) || [];
        
        if (pool.length > 0) {
            return pool.pop();
        }
        
        // Create new instance if pool is empty
        switch (type) {
            case 'FastCache':
                return new FastCache(...args);
            case 'QueryProcessor':
                return new QueryProcessor(...args);
            case 'PerformanceProfiler':
                return new PerformanceProfiler(...args);
            default:
                throw new Error(`Unknown type: ${type}`);
        }
    }

    returnObject(type, object) {
        // Reset object state
        if (object.clear) {
            object.clear();
        }
        if (object.reset) {
            object.reset();
        }

        const pool = this.objectPool.get(type) || [];
        if (pool.length < 10) { // Limit pool size
            pool.push(object);
            this.objectPool.set(type, pool);
        } else {
            // Free the object if pool is full
            if (object.free) {
                object.free();
            }
        }
    }

    startCleanup() {
        this.cleanupInterval = setInterval(() => {
            // Periodic cleanup of unused objects
            for (const [type, pool] of this.objectPool.entries()) {
                if (pool.length > 5) {
                    const excess = pool.splice(5);
                    excess.forEach(obj => {
                        if (obj.free) {
                            obj.free();
                        }
                    });
                }
            }
        }, 60000); // Every minute
    }

    stopCleanup() {
        if (this.cleanupInterval) {
            clearInterval(this.cleanupInterval);
            this.cleanupInterval = null;
        }
    }

    // Force garbage collection
    forceGC() {
        if (window.gc) {
            window.gc();
        }
        
        // Clear all pools
        for (const [type, pool] of this.objectPool.entries()) {
            pool.forEach(obj => {
                if (obj.free) {
                    obj.free();
                }
            });
        }
        this.objectPool.clear();
    }
}

JavaScript Bindings

Core Bindings Architecture

The FACT WASM module uses wasm-bindgen to generate JavaScript bindings:

// wasm-bindgen exports
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
extern "C" {
    // Import JavaScript functions
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: &str);
    
    #[wasm_bindgen(js_namespace = performance)]
    fn now() -> f64;
}

// Export Rust functions to JavaScript
#[wasm_bindgen]
pub fn greet(name: &str) -> String {
    format!("Hello, {}! Welcome to FACT WASM.", name)
}

#[wasm_bindgen]
pub fn get_wasm_info() -> JsValue {
    let info = WasmInfo {
        version: env!("CARGO_PKG_VERSION").to_string(),
        features: vec!["cache".to_string(), "performance".to_string()],
        memory_pages: 64,
        compile_time: chrono::Utc::now().to_rfc3339(),
    };
    
    serde_wasm_bindgen::to_value(&info).unwrap()
}

// Complex data structures
#[wasm_bindgen]
pub struct QueryResult {
    success: bool,
    execution_time_ms: f64,
    cache_hit: bool,
    data: String,
}

#[wasm_bindgen]
impl QueryResult {
    #[wasm_bindgen(constructor)]
    pub fn new(success: bool, execution_time_ms: f64, cache_hit: bool, data: String) -> QueryResult {
        QueryResult {
            success,
            execution_time_ms,
            cache_hit,
            data,
        }
    }
    
    #[wasm_bindgen(getter)]
    pub fn success(&self) -> bool {
        self.success
    }
    
    #[wasm_bindgen(getter)]
    pub fn execution_time_ms(&self) -> f64 {
        self.execution_time_ms
    }
    
    #[wasm_bindgen(getter)]
    pub fn cache_hit(&self) -> bool {
        self.cache_hit
    }
    
    #[wasm_bindgen(getter)]
    pub fn data(&self) -> String {
        self.data.clone()
    }
    
    #[wasm_bindgen(setter)]
    pub fn set_data(&mut self, data: String) {
        self.data = data;
    }
}

Advanced JavaScript Interop

// Advanced interop patterns
class FACTInterop {
    constructor(wasmModule) {
        this.wasm = wasmModule;
        this.callbacks = new Map();
        this.eventHandlers = new Map();
    }

    // Register JavaScript callbacks for WASM
    registerCallback(name, callback) {
        const id = Math.random().toString(36).substr(2, 9);
        this.callbacks.set(id, callback);
        
        // Make callback available to WASM
        window[`__fact_callback_${id}`] = callback;
        
        return id;
    }

    // Execute callback from WASM
    executeCallback(callbackId, ...args) {
        const callback = this.callbacks.get(callbackId);
        if (callback) {
            return callback(...args);
        }
        throw new Error(`Callback ${callbackId} not found`);
    }

    // Stream processing with chunks
    async processStream(stream, chunkSize = 1024) {
        const results = [];
        const reader = stream.getReader();
        
        try {
            while (true) {
                const { done, value } = await reader.read();
                if (done) break;
                
                // Process chunk in WASM
                const chunkResult = this.wasm.process_chunk(
                    new Uint8Array(value)
                );
                results.push(chunkResult);
            }
        } finally {
            reader.releaseLock();
        }
        
        return results;
    }

    // Shared array buffer for zero-copy data transfer
    createSharedBuffer(size) {
        if (typeof SharedArrayBuffer !== 'undefined') {
            const buffer = new SharedArrayBuffer(size);
            const wasmMemory = this.wasm.get_shared_memory_ptr(size);
            
            return {
                jsBuffer: buffer,
                wasmPtr: wasmMemory,
                view: new Uint8Array(buffer)
            };
        }
        
        // Fallback to regular ArrayBuffer
        const buffer = new ArrayBuffer(size);
        return {
            jsBuffer: buffer,
            wasmPtr: null,
            view: new Uint8Array(buffer)
        };
    }
}

TypeScript Definitions

Generated Type Definitions

The build process automatically generates comprehensive TypeScript definitions:

// Generated fact_wasm_core.d.ts
declare module 'fact-wasm-core' {
    export interface WasmInfo {
        version: string;
        features: string[];
        memory_pages: number;
        compile_time: string;
    }

    export interface CacheStats {
        entries: number;
        hit_count: number;
        miss_count: number;
        hit_rate: number;
        memory_usage_bytes: number;
    }

    export interface QueryStats {
        total_queries: number;
        cache_hits: number;
        average_execution_time_ms: number;
        memory_usage_bytes: number;
    }

    export class FastCache {
        constructor(max_size: number);
        
        set(key: string, data: string, ttl_ms: bigint): boolean;
        get(key: string): string | undefined;
        stats(): CacheStats;
        clear(): void;
        free(): void;
    }

    export class QueryProcessor {
        constructor();
        
        process_query(query: string): QueryResult;
        get_stats(): QueryStats;
        clear_cache(): void;
        free(): void;
    }

    export class QueryResult {
        constructor(success: boolean, execution_time_ms: number, cache_hit: boolean, data: string);
        
        readonly success: boolean;
        readonly execution_time_ms: number;
        readonly cache_hit: boolean;
        data: string;
        
        free(): void;
    }

    export class Timer {
        constructor(label: string);
        
        elapsed(): number;
        finish(): number;
        free(): void;
    }

    export class PerformanceProfiler {
        constructor();
        
        mark(label: string): void;
        get_report(): any;
        reset(): void;
        free(): void;
    }

    // Utility functions
    export function greet(name: string): string;
    export function get_wasm_info(): WasmInfo;
    export function get_memory_usage(): any;
    export function benchmark_cache_operations(iterations: number): any;
    export function safe_json_parse(json_str: string): any;
    export function simple_hash(input: string): number;
    export function validate_sql_query(query: string): any;
    export function escape_sql_string(input: string): string;
    export function format_bytes(bytes: number): string;

    // Initialization
    export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
    export interface InitOutput {
        readonly memory: WebAssembly.Memory;
    }

    export default function init(module_or_path?: InitInput | Promise<InitInput>): Promise<InitOutput>;
}

Custom Type Extensions

// fact-wasm-extensions.d.ts
import { FastCache, QueryProcessor, PerformanceProfiler } from 'fact-wasm-core';

declare global {
    interface Window {
        FACT?: {
            cache?: FastCache;
            processor?: QueryProcessor;
            profiler?: PerformanceProfiler;
            initialized: boolean;
        };
    }
}

// Enhanced interfaces
export interface FACTConfig {
    cacheSize?: number;
    enableMonitoring?: boolean;
    enableWorker?: boolean;
    wasmPath?: string;
    fallbackToJS?: boolean;
}

export interface FACTPerformanceMetrics {
    cacheHitRate: number;
    averageQueryTime: number;
    memoryUsage: number;
    wasmMemoryPages: number;
    totalOperations: number;
}

export interface FACTQueryOptions {
    useCache?: boolean;
    timeout?: number;
    priority?: 'low' | 'medium' | 'high';
    enableProfiling?: boolean;
}

export class FACTManager {
    constructor(config?: FACTConfig);
    
    initialize(): Promise<void>;
    isInitialized(): boolean;
    
    // Cache operations
    cacheGet<T = any>(key: string): Promise<T | null>;
    cacheSet<T = any>(key: string, value: T, ttl?: number): Promise<boolean>;
    cacheClear(): Promise<void>;
    
    // Query operations
    processQuery(query: string, options?: FACTQueryOptions): Promise<QueryResult>;
    
    // Performance monitoring
    getMetrics(): Promise<FACTPerformanceMetrics>;
    startMonitoring(interval?: number): void;
    stopMonitoring(): void;
    
    // Memory management
    optimize(): Promise<void>;
    cleanup(): Promise<void>;
    
    // Event handlers
    on(event: 'initialized' | 'error' | 'metrics', handler: Function): void;
    off(event: string, handler: Function): void;
}

// Re-export core types
export * from 'fact-wasm-core';

Example Applications

1. Real-time Data Dashboard

<!DOCTYPE html>
<html>
<head>
    <title>FACT WASM Dashboard</title>
    <style>
        .dashboard { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; padding: 20px; }
        .widget { background: #f5f5f5; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
        .metric { font-size: 2em; font-weight: bold; color: #2c3e50; }
        .status.online { color: #27ae60; }
        .status.offline { color: #e74c3c; }
    </style>
</head>
<body>
    <div class="dashboard">
        <div class="widget">
            <h3>Cache Performance</h3>
            <div class="metric" id="cacheHitRate">--</div>
            <div>Hit Rate</div>
        </div>
        
        <div class="widget">
            <h3>Query Processing</h3>
            <div class="metric" id="avgQueryTime">--</div>
            <div>Avg Response Time (ms)</div>
        </div>
        
        <div class="widget">
            <h3>Memory Usage</h3>
            <div class="metric" id="memoryUsage">--</div>
            <div>WASM Memory (MB)</div>
        </div>
        
        <div class="widget">
            <h3>System Status</h3>
            <div class="metric status" id="systemStatus">OFFLINE</div>
            <div>WASM Module</div>
        </div>
    </div>

    <script type="module">
        import { FACTManager } from './fact-manager.js';

        class Dashboard {
            constructor() {
                this.fact = new FACTManager({
                    cacheSize: 5000,
                    enableMonitoring: true
                });
                this.updateInterval = null;
            }

            async initialize() {
                try {
                    await this.fact.initialize();
                    document.getElementById('systemStatus').textContent = 'ONLINE';
                    document.getElementById('systemStatus').className = 'metric status online';
                    
                    this.startUpdates();
                } catch (error) {
                    console.error('Dashboard initialization failed:', error);
                    document.getElementById('systemStatus').textContent = 'ERROR';
                    document.getElementById('systemStatus').className = 'metric status offline';
                }
            }

            startUpdates() {
                this.updateInterval = setInterval(async () => {
                    try {
                        const metrics = await this.fact.getMetrics();
                        
                        document.getElementById('cacheHitRate').textContent = 
                            (metrics.cacheHitRate * 100).toFixed(1) + '%';
                        
                        document.getElementById('avgQueryTime').textContent = 
                            metrics.averageQueryTime.toFixed(2);
                        
                        document.getElementById('memoryUsage').textContent = 
                            metrics.memoryUsage.toFixed(1);
                            
                    } catch (error) {
                        console.error('Failed to update metrics:', error);
                    }
                }, 2000);
            }

            destroy() {
                if (this.updateInterval) {
                    clearInterval(this.updateInterval);
                }
                this.fact.cleanup();
            }
        }

        const dashboard = new Dashboard();
        dashboard.initialize();

        // Cleanup on page unload
        window.addEventListener('beforeunload', () => {
            dashboard.destroy();
        });
    </script>
</body>
</html>

2. High-Performance Data Processing Worker

// data-processing-worker.js
importScripts('./pkg/fact_wasm_core.js');

class DataProcessingWorker {
    constructor() {
        this.initialized = false;
        this.processor = null;
        this.cache = null;
        this.profiler = null;
    }

    async initialize() {
        try {
            // Load WASM module
            const wasmModule = await import('./pkg/fact_wasm_core.js');
            await wasmModule.default();
            
            this.processor = new wasmModule.QueryProcessor();
            this.cache = new wasmModule.FastCache(10000);
            this.profiler = new wasmModule.PerformanceProfiler();
            
            this.initialized = true;
            console.log('✅ Data processing worker initialized');
            
        } catch (error) {
            console.error('❌ Worker initialization failed:', error);
            throw error;
        }
    }

    async processDataBatch(batch) {
        if (!this.initialized) {
            throw new Error('Worker not initialized');
        }

        this.profiler.mark('batch_start');
        const results = [];
        
        for (const item of batch) {
            try {
                // Check cache first
                const cacheKey = `processed_${item.id}`;
                const cached = this.cache.get(cacheKey);
                
                if (cached) {
                    results.push(JSON.parse(cached));
                    continue;
                }
                
                // Process with WASM
                const query = this.buildQuery(item);
                const result = this.processor.process_query(query);
                
                const processedItem = {
                    id: item.id,
                    success: result.success,
                    data: JSON.parse(result.data),
                    executionTime: result.execution_time_ms,
                    cached: false
                };
                
                // Cache the result
                this.cache.set(cacheKey, JSON.stringify(processedItem), 300000n); // 5 minutes
                
                results.push(processedItem);
                
            } catch (error) {
                results.push({
                    id: item.id,
                    success: false,
                    error: error.message
                });
            }
        }
        
        this.profiler.mark('batch_end');
        
        return {
            results,
            batchSize: batch.length,
            performanceReport: this.profiler.get_report()
        };
    }

    buildQuery(item) {
        // Build SQL query based on item data
        return `SELECT * FROM data_table WHERE id = '${item.id}' AND type = '${item.type}'`;
    }

    getStats() {
        if (!this.initialized) {
            return { error: 'Not initialized' };
        }

        return {
            cache: this.cache.stats(),
            processor: this.processor.get_stats(),
            performance: this.profiler.get_report()
        };
    }
}

// Worker message handling
const worker = new DataProcessingWorker();
let initPromise = null;

self.addEventListener('message', async (event) => {
    const { type, data, id } = event.data;

    try {
        // Initialize on first message
        if (!initPromise) {
            initPromise = worker.initialize();
        }
        await initPromise;

        switch (type) {
            case 'PROCESS_BATCH':
                const result = await worker.processDataBatch(data.batch);
                self.postMessage({ type: 'BATCH_COMPLETE', data: result, id });
                break;

            case 'GET_STATS':
                const stats = worker.getStats();
                self.postMessage({ type: 'STATS_RESPONSE', data: stats, id });
                break;

            case 'CLEAR_CACHE':
                worker.cache.clear();
                self.postMessage({ type: 'CACHE_CLEARED', id });
                break;

            default:
                self.postMessage({ type: 'ERROR', data: { message: `Unknown message type: ${type}` }, id });
        }

    } catch (error) {
        self.postMessage({ type: 'ERROR', data: { message: error.message }, id });
    }
});

3. React Application with WASM Integration

// FACTProvider.jsx
import React, { createContext, useContext, useEffect, useState } from 'react';
import { FACTManager } from './fact-manager';

const FACTContext = createContext(null);

export const useFACT = () => {
    const context = useContext(FACTContext);
    if (!context) {
        throw new Error('useFACT must be used within a FACTProvider');
    }
    return context;
};

export const FACTProvider = ({ children, config = {} }) => {
    const [fact, setFact] = useState(null);
    const [initialized, setInitialized] = useState(false);
    const [error, setError] = useState(null);
    const [metrics, setMetrics] = useState(null);

    useEffect(() => {
        const initializeFACT = async () => {
            try {
                const factManager = new FACTManager({
                    cacheSize: 2000,
                    enableMonitoring: true,
                    ...config
                });

                await factManager.initialize();
                
                // Start metrics collection
                factManager.on('metrics', setMetrics);
                factManager.startMonitoring(5000); // Every 5 seconds

                setFact(factManager);
                setInitialized(true);
                
            } catch (err) {
                setError(err.message);
                console.error('FACT initialization failed:', err);
            }
        };

        initializeFACT();

        // Cleanup on unmount
        return () => {
            if (fact) {
                fact.stopMonitoring();
                fact.cleanup();
            }
        };
    }, []);

    const value = {
        fact,
        initialized,
        error,
        metrics,
        
        // Helper methods
        processQuery: async (query, options = {}) => {
            if (!fact) throw new Error('FACT not initialized');
            return fact.processQuery(query, options);
        },
        
        cacheGet: async (key) => {
            if (!fact) throw new Error('FACT not initialized');
            return fact.cacheGet(key);
        },
        
        cacheSet: async (key, value, ttl) => {
            if (!fact) throw new Error('FACT not initialized');
            return fact.cacheSet(key, value, ttl);
        }
    };

    return (
        <FACTContext.Provider value={value}>
            {children}
        </FACTContext.Provider>
    );
};

// QueryComponent.jsx
import React, { useState } from 'react';
import { useFACT } from './FACTProvider';

export const QueryComponent = () => {
    const { processQuery, initialized, error } = useFACT();
    const [query, setQuery] = useState('SELECT * FROM companies LIMIT 10');
    const [result, setResult] = useState(null);
    const [loading, setLoading] = useState(false);

    const executeQuery = async () => {
        if (!initialized) return;

        setLoading(true);
        try {
            const result = await processQuery(query, {
                useCache: true,
                enableProfiling: true
            });
            setResult(result);
        } catch (err) {
            setResult({ error: err.message });
        } finally {
            setLoading(false);
        }
    };

    if (error) {
        return <div className="error">FACT Error: {error}</div>;
    }

    if (!initialized) {
        return <div className="loading">Initializing FACT WASM...</div>;
    }

    return (
        <div className="query-component">
            <div className="query-input">
                <textarea
                    value={query}
                    onChange={(e) => setQuery(e.target.value)}
                    placeholder="Enter SQL query..."
                    rows={3}
                />
                <button onClick={executeQuery} disabled={loading}>
                    {loading ? 'Processing...' : 'Execute Query'}
                </button>
            </div>

            {result && (
                <div className="query-result">
                    <h3>Result:</h3>
                    <div className="result-stats">
                        <span>Success: {result.success ? '✅' : '❌'}</span>
                        <span>Execution Time: {result.executionTime?.toFixed(2)}ms</span>
                        <span>Cache Hit: {result.cacheHit ? '✅' : '❌'}</span>
                    </div>
                    <pre className="result-data">
                        {JSON.stringify(result.data || result.error, null, 2)}
                    </pre>
                </div>
            )}
        </div>
    );
};

// PerformanceMonitor.jsx
import React from 'react';
import { useFACT } from './FACTProvider';

export const PerformanceMonitor = () => {
    const { metrics, initialized } = useFACT();

    if (!initialized || !metrics) {
        return <div>No metrics available</div>;
    }

    return (
        <div className="performance-monitor">
            <h3>Performance Metrics</h3>
            <div className="metrics-grid">
                <div className="metric">
                    <span className="metric-value">
                        {(metrics.cacheHitRate * 100).toFixed(1)}%
                    </span>
                    <span className="metric-label">Cache Hit Rate</span>
                </div>
                <div className="metric">
                    <span className="metric-value">
                        {metrics.averageQueryTime.toFixed(2)}ms
                    </span>
                    <span className="metric-label">Avg Query Time</span>
                </div>
                <div className="metric">
                    <span className="metric-value">
                        {metrics.memoryUsage.toFixed(1)}MB
                    </span>
                    <span className="metric-label">Memory Usage</span>
                </div>
                <div className="metric">
                    <span className="metric-value">
                        {metrics.totalOperations}
                    </span>
                    <span className="metric-label">Total Operations</span>
                </div>
            </div>
        </div>
    );
};

// App.jsx
import React from 'react';
import { FACTProvider } from './components/FACTProvider';
import { QueryComponent } from './components/QueryComponent';
import { PerformanceMonitor } from './components/PerformanceMonitor';

function App() {
    return (
        <FACTProvider config={{ cacheSize: 5000 }}>
            <div className="app">
                <header>
                    <h1>FACT WASM React Demo</h1>
                </header>
                <main>
                    <div className="dashboard">
                        <QueryComponent />
                        <PerformanceMonitor />
                    </div>
                </main>
            </div>
        </FACTProvider>
    );
}

export default App;

Deployment Strategies

1. CDN Deployment

# Build for CDN distribution
cd wasm/
./build.sh

# Upload to CDN
aws s3 cp ../pkg/ s3://your-cdn-bucket/fact-wasm/ --recursive
aws cloudfront create-invalidation --distribution-id YOUR_DIST_ID --paths "/fact-wasm/*"
<!-- CDN Usage -->
<script type="module">
    import init, { FastCache, QueryProcessor } from 'https://cdn.yoursite.com/fact-wasm/fact_wasm_core.js';
    
    async function initFACT() {
        await init('https://cdn.yoursite.com/fact-wasm/fact_wasm_core_bg.wasm');
        // Use FACT components
    }
    
    initFACT();
</script>

2. NPM Package Distribution

// package.json for NPM distribution
{
    "name": "@fact/wasm-core",
    "version": "1.0.0",
    "description": "High-performance WASM core for FACT system",
    "main": "pkg/fact_wasm_core.js",
    "types": "pkg/fact_wasm_core.d.ts",
    "files": [
        "pkg/**/*",
        "README.md",
        "LICENSE"
    ],
    "keywords": ["wasm", "webassembly", "performance", "cache", "query"],
    "browser": {
        "pkg/fact_wasm_core_bg.wasm": "./pkg/fact_wasm_core_bg.wasm"
    }
}
# Install from NPM
npm install @fact/wasm-core

# Use in project
import init, { FastCache } from '@fact/wasm-core';
await init();
const cache = new FastCache(1000);

3. Docker Deployment

# Dockerfile for WASM-enabled Node.js app
FROM node:18-alpine

# Install build dependencies
RUN apk add --no-cache \
    build-base \
    curl

# Install Rust and wasm-pack
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"
RUN cargo install wasm-pack

WORKDIR /app

# Copy source
COPY . .

# Build WASM
RUN cd wasm && ./build.sh

# Install Node dependencies
RUN npm ci --only=production

# Expose port
EXPOSE 3000

# Start application
CMD ["node", "server.js"]

4. Serverless Deployment

// serverless-handler.js
const { FastCache, QueryProcessor } = require('./pkg/fact_wasm_core.js');
const fs = require('fs');

let wasmInitialized = false;
let cache, processor;

async function initializeWASM() {
    if (wasmInitialized) return;
    
    try {
        const wasmBytes = fs.readFileSync('./pkg/fact_wasm_core_bg.wasm');
        const wasmModule = require('./pkg/fact_wasm_core.js');
        
        await wasmModule.default(wasmBytes);
        
        cache = new wasmModule.FastCache(1000);
        processor = new wasmModule.QueryProcessor();
        
        wasmInitialized = true;
        console.log('✅ WASM initialized in serverless function');
        
    } catch (error) {
        console.error('❌ WASM initialization failed:', error);
        throw error;
    }
}

exports.handler = async (event, context) => {
    // Initialize WASM on cold start
    await initializeWASM();
    
    try {
        const { query, operation } = JSON.parse(event.body);
        
        switch (operation) {
            case 'query':
                const result = processor.process_query(query);
                return {
                    statusCode: 200,
                    body: JSON.stringify({
                        success: result.success,
                        data: JSON.parse(result.data),
                        executionTime: result.execution_time_ms,
                        cacheHit: result.cache_hit
                    })
                };
                
            case 'cache_stats':
                const stats = cache.stats();
                return {
                    statusCode: 200,
                    body: JSON.stringify(stats)
                };
                
            default:
                return {
                    statusCode: 400,
                    body: JSON.stringify({ error: 'Unknown operation' })
                };
        }
        
    } catch (error) {
        return {
            statusCode: 500,
            body: JSON.stringify({ error: error.message })
        };
    }
};

5. Progressive Web App (PWA) Integration

// sw.js - Service Worker with WASM caching
const CACHE_NAME = 'fact-wasm-v1';
const WASM_CACHE = 'fact-wasm-binaries-v1';

const urlsToCache = [
    '/',
    '/pkg/fact_wasm_core.js',
    '/pkg/fact_wasm_core_bg.wasm',
    '/pkg/fact_wasm_core.d.ts'
];

// Install event - cache WASM files
self.addEventListener('install', (event) => {
    event.waitUntil(
        Promise.all([
            caches.open(CACHE_NAME).then((cache) => cache.addAll(urlsToCache)),
            caches.open(WASM_CACHE).then((cache) => cache.addAll([
                '/pkg/fact_wasm_core_bg.wasm'
            ]))
        ])
    );
});

// Fetch event - serve WASM from cache
self.addEventListener('fetch', (event) => {
    if (event.request.url.endsWith('.wasm')) {
        event.respondWith(
            caches.match(event.request, { cacheName: WASM_CACHE })
                .then((response) => response || fetch(event.request))
        );
    } else {
        event.respondWith(
            caches.match(event.request)
                .then((response) => response || fetch(event.request))
        );
    }
});

// Background sync for WASM updates
self.addEventListener('sync', (event) => {
    if (event.tag === 'wasm-update') {
        event.waitUntil(updateWASMCache());
    }
});

async function updateWASMCache() {
    const cache = await caches.open(WASM_CACHE);
    await cache.addAll(['/pkg/fact_wasm_core_bg.wasm']);
}
// manifest.json for PWA
{
    "name": "FACT WASM Application",
    "short_name": "FACT WASM",
    "description": "High-performance context processing with WebAssembly",
    "start_url": "/",
    "display": "standalone",
    "background_color": "#ffffff",
    "theme_color": "#2c3e50",
    "icons": [
        {
            "src": "/icons/icon-192.png",
            "sizes": "192x192",
            "type": "image/png"
        },
        {
            "src": "/icons/icon-512.png",
            "sizes": "512x512",
            "type": "image/png"
        }
    ]
}

Troubleshooting

Common Issues and Solutions

1. WASM Loading Failures

Problem: TypeError: Failed to instantiate WebAssembly module

Solutions:

// Check WASM support
if (!('WebAssembly' in window)) {
    console.error('WebAssembly not supported');
    // Fallback to JavaScript implementation
}

// Add error handling for module loading
try {
    await init();
} catch (error) {
    if (error.message.includes('Invalid')) {
        console.error('WASM file corrupted or invalid');
        // Try redownloading or use backup
    } else if (error.message.includes('network')) {
        console.error('WASM file loading failed');
        // Retry with exponential backoff
    }
}

// Verify WASM file integrity
const response = await fetch('./pkg/fact_wasm_core_bg.wasm');
const buffer = await response.arrayBuffer();
console.log('WASM file size:', buffer.byteLength);

if (buffer.byteLength === 0) {
    throw new Error('WASM file is empty');
}

2. Memory Management Issues

Problem: RangeError: Maximum call stack size exceeded

Solutions:

// Implement proper cleanup
class WASMManager {
    constructor() {
        this.instances = new Set();
    }
    
    createInstance(Class, ...args) {
        const instance = new Class(...args);
        this.instances.add(instance);
        return instance;
    }
    
    cleanup() {
        for (const instance of this.instances) {
            if (instance.free) {
                instance.free();
            }
        }
        this.instances.clear();
    }
}

// Use WeakMap for automatic cleanup
const instanceCleanup = new WeakMap();

function createManagedInstance(Class, ...args) {
    const instance = new Class(...args);
    
    // Schedule cleanup when instance is garbage collected
    instanceCleanup.set(instance, () => {
        if (instance.free) {
            instance.free();
        }
    });
    
    return instance;
}

3. Performance Issues

Problem: WASM slower than expected

Debugging:

// Performance profiling
const profiler = new PerformanceProfiler();

profiler.mark('operation_start');
const result = cache.get('key');
profiler.mark('operation_end');

const report = profiler.get_report();
console.log('Performance report:', report);

// Memory usage monitoring
function monitorMemory() {
    const usage = get_memory_usage();
    console.log('Memory usage:', {
        wasm: usage.wasm_memory_mb + 'MB',
        js: (performance.memory?.usedJSHeapSize / 1024 / 1024).toFixed(2) + 'MB'
    });
}

setInterval(monitorMemory, 5000);

// Check for memory leaks
let lastMemoryUsage = 0;
function checkMemoryLeaks() {
    const current = get_memory_usage().wasm_memory_mb;
    const increase = current - lastMemoryUsage;
    
    if (increase > 10) { // More than 10MB increase
        console.warn('Potential memory leak detected:', increase, 'MB');
    }
    
    lastMemoryUsage = current;
}

setInterval(checkMemoryLeaks, 30000);

4. Browser Compatibility

Problem: WASM features not supported

Feature detection:

async function detectWASMFeatures() {
    const features = {
        basicWASM: false,
        simd: false,
        threads: false,
        bulkMemory: false
    };
    
    try {
        // Test basic WASM
        await WebAssembly.instantiate(new Uint8Array([
            0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00
        ]));
        features.basicWASM = true;
    } catch {}
    
    try {
        // Test SIMD
        await WebAssembly.compile(new Uint8Array([
            0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
            0x01, 0x04, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02,
            0x01, 0x00, 0x0a, 0x09, 0x01, 0x07, 0x00, 0xfd,
            0x0c, 0x00, 0x00, 0x00, 0x00, 0x0b
        ]));
        features.simd = true;
    } catch {}
    
    // Test threads (SharedArrayBuffer)
    features.threads = typeof SharedArrayBuffer !== 'undefined';
    
    try {
        // Test bulk memory
        await WebAssembly.compile(new Uint8Array([
            0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
            0x01, 0x04, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02,
            0x01, 0x00, 0x05, 0x03, 0x01, 0x00, 0x10, 0x0a,
            0x09, 0x01, 0x07, 0x00, 0xfc, 0x08, 0x00, 0x00,
            0x41, 0x00, 0x0b
        ]));
        features.bulkMemory = true;
    } catch {}
    
    return features;
}

// Use feature detection for progressive enhancement
const wasmFeatures = await detectWASMFeatures();

if (!wasmFeatures.basicWASM) {
    console.warn('WASM not supported, using JavaScript fallback');
    // Use JavaScript implementation
} else if (!wasmFeatures.simd) {
    console.warn('SIMD not supported, using basic WASM build');
    // Load non-SIMD WASM build
}

5. Build Issues

Problem: Build fails with linker errors

Solutions:

# Update Rust toolchain
rustup update

# Add WASM target
rustup target add wasm32-unknown-unknown

# Clean and rebuild
cd wasm/
cargo clean
rm -rf pkg/
./build.sh

# Check for missing dependencies
wasm-pack --version
rustc --version --verbose

# Verify Cargo.toml dependencies
cargo check

Debug Configuration

# Cargo.toml - Debug configuration
[profile.dev]
debug = true
opt-level = 1
panic = "unwind"

[features]
debug = ["console_error_panic_hook", "web-sys/console"]
// lib.rs - Debug utilities
#[cfg(feature = "debug")]
use web_sys::console;

#[cfg(feature = "debug")]
macro_rules! console_log {
    ($($t:tt)*) => (console::log_1(&format_args!($($t)*).to_string().into()))
}

#[cfg(not(feature = "debug"))]
macro_rules! console_log {
    ($($t:tt)*) => {};
}

// Usage in WASM code
console_log!("Cache hit rate: {:.2}%", hit_rate * 100.0);

This comprehensive WASM integration guide covers all aspects of building, deploying, and optimizing FACT's WebAssembly components. The examples demonstrate real-world usage patterns and provide solutions for common integration challenges.

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