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* Coherent.js Code Splitting
*
* Dynamic imports and code splitting utilities
*
* @module performance/code-splitting
*/
/**
* Code Splitter
* Manages dynamic imports and lazy loading
*/
export class CodeSplitter {
constructor(options = {}) {
this.options = {
preload: [],
prefetch: [],
timeout: 10000,
retries: 3,
...options
};
this.modules = new Map();
this.loading = new Map();
this.failed = new Set();
}
/**
* Dynamically import a module
*
* @param {string} path - Module path
* @param {Object} [options] - Import options
* @returns {Promise} Module exports
*/
async import(path, options = {}) {
// Check cache
if (this.modules.has(path)) {
return this.modules.get(path);
}
// Check if already loading
if (this.loading.has(path)) {
return this.loading.get(path);
}
// Create import promise
const importPromise = this.loadModule(path, options);
this.loading.set(path, importPromise);
try {
const module = await importPromise;
this.modules.set(path, module);
this.loading.delete(path);
return module;
} catch (error) {
this.loading.delete(path);
this.failed.add(path);
throw error;
}
}
/**
* Load module with retries
*/
async loadModule(path, options = {}) {
const maxRetries = options.retries ?? this.options.retries;
const timeout = options.timeout ?? this.options.timeout;
let lastError;
for (let attempt = 0; attempt <= maxRetries; attempt++) {
try {
// Add cache busting if retry
const importPath = attempt > 0
? `${path}?retry=${attempt}&t=${Date.now()}`
: path;
// Import with timeout
const module = await Promise.race([
import(importPath),
new Promise((_, reject) =>
setTimeout(() => reject(new Error('Import timeout')), timeout)
)
]);
return module;
} catch (error) {
lastError = error;
if (attempt < maxRetries) {
// Exponential backoff
await new Promise(resolve =>
setTimeout(resolve, Math.pow(2, attempt) * 1000)
);
}
}
}
throw new Error(`Failed to load module ${path}: ${lastError.message}`);
}
/**
* Preload modules
*/
async preload(paths) {
const pathArray = Array.isArray(paths) ? paths : [paths];
return Promise.all(
pathArray.map(path => this.import(path).catch(err => {
console.warn(`Failed to preload ${path}:`, err);
return null;
}))
);
}
/**
* Prefetch modules (low priority)
*/
prefetch(paths) {
const pathArray = Array.isArray(paths) ? paths : [paths];
if (typeof requestIdleCallback !== 'undefined') {
requestIdleCallback(() => {
pathArray.forEach(path => {
this.import(path).catch(() => {});
});
});
} else {
setTimeout(() => {
pathArray.forEach(path => {
this.import(path).catch(() => {});
});
}, 0);
}
}
/**
* Check if module is loaded
*/
isLoaded(path) {
return this.modules.has(path);
}
/**
* Check if module is loading
*/
isLoading(path) {
return this.loading.has(path);
}
/**
* Check if module failed to load
*/
hasFailed(path) {
return this.failed.has(path);
}
/**
* Clear cache
*/
clearCache(path = null) {
if (path) {
this.modules.delete(path);
this.failed.delete(path);
} else {
this.modules.clear();
this.failed.clear();
}
}
/**
* Get statistics
*/
getStats() {
return {
loaded: this.modules.size,
loading: this.loading.size,
failed: this.failed.size,
modules: Array.from(this.modules.keys())
};
}
}
/**
* Create a code splitter
*/
export function createCodeSplitter(options = {}) {
return new CodeSplitter(options);
}
/**
* Lazy load a component
*
* @param {Function} loader - Function that returns import promise
* @param {Object} [options] - Lazy loading options
* @returns {Function} Lazy component
*/
export function lazy(loader, options = {}) {
let modulePromise = null;
let module = null;
let error = null;
return function LazyComponent(props = {}) {
// If already loaded, return component
if (module) {
const Component = module.default || module;
return Component(props);
}
// If error occurred, show error
Iif (error) {
if (options.errorComponent) {
return options.errorComponent({ error, retry: () => {
error = null;
modulePromise = null;
return LazyComponent(props);
}});
}
return {
div: {
className: 'lazy-error',
text: `Error loading component: ${error.message}`
}
};
}
// Start loading if not already
Eif (!modulePromise) {
modulePromise = loader()
.then(mod => {
module = mod;
return mod;
})
.catch(err => {
error = err;
throw err;
});
}
// Show loading state
if (options.loadingComponent) {
return options.loadingComponent(props);
}
return {
div: {
className: 'lazy-loading',
text: options.loadingText || 'Loading...'
}
};
};
}
/**
* Split component into chunks
*/
export function splitComponent(componentPath, options = {}) {
const splitter = new CodeSplitter(options);
return lazy(
() => splitter.import(componentPath),
options
);
}
/**
* Create route-based code splitting
*/
export function createRouteSplitter(routes) {
const splitter = new CodeSplitter();
const routeMap = new Map();
// Process routes
for (const [path, config] of Object.entries(routes)) {
if (typeof config === 'string') {
// Simple path to component
routeMap.set(path, {
loader: () => splitter.import(config)
});
} else {
// Full config
routeMap.set(path, {
loader: () => splitter.import(config.component),
preload: config.preload || [],
...config
});
}
}
return {
/**
* Load route component
*/
async loadRoute(path) {
const route = routeMap.get(path);
Eif (!route) {
throw new Error(`Route not found: ${path}`);
}
// Preload dependencies
if (route.preload && route.preload.length > 0) {
splitter.prefetch(route.preload);
}
// Load main component
return await route.loader();
},
/**
* Preload route
*/
preloadRoute(path) {
const route = routeMap.get(path);
if (route) {
return route.loader();
}
},
/**
* Get all routes
*/
getRoutes() {
return Array.from(routeMap.keys());
},
/**
* Get splitter instance
*/
getSplitter() {
return splitter;
}
};
}
/**
* Bundle analyzer helper
*/
export class BundleAnalyzer {
constructor() {
this.chunks = new Map();
this.loadTimes = new Map();
}
/**
* Track chunk load
*/
trackLoad(chunkName, size, loadTime) {
this.chunks.set(chunkName, { size, loadTime });
this.loadTimes.set(chunkName, loadTime);
}
/**
* Get bundle statistics
*/
getStats() {
const chunks = Array.from(this.chunks.entries());
const totalSize = chunks.reduce((sum, [, chunk]) => sum + chunk.size, 0);
const avgLoadTime = chunks.reduce((sum, [, chunk]) => sum + chunk.loadTime, 0) / chunks.length;
return {
totalChunks: chunks.length,
totalSize,
averageLoadTime: avgLoadTime,
chunks: chunks.map(([name, data]) => ({
name,
size: data.size,
loadTime: data.loadTime,
percentage: (data.size / totalSize * 100).toFixed(2)
}))
};
}
/**
* Find largest chunks
*/
getLargestChunks(limit = 10) {
return Array.from(this.chunks.entries())
.sort((a, b) => b[1].size - a[1].size)
.slice(0, limit)
.map(([name, data]) => ({ name, ...data }));
}
/**
* Find slowest chunks
*/
getSlowestChunks(limit = 10) {
return Array.from(this.chunks.entries())
.sort((a, b) => b[1].loadTime - a[1].loadTime)
.slice(0, limit)
.map(([name, data]) => ({ name, ...data }));
}
}
export default {
CodeSplitter,
createCodeSplitter,
lazy,
splitComponent,
createRouteSplitter,
BundleAnalyzer
};
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