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* Universal Module Loader - Loads modules across different JavaScript environments
* Provides dynamic module loading for browser, Node.js, Deno, Bun, and edge environments
*/
export class UniversalLoader {
constructor(options = {}) {
this.options = {
baseUrl: '',
moduleMap: {},
fallbackUrls: [],
cache: true,
...options
};
this.moduleCache = new Map();
this.loadingPromises = new Map();
this.environment = this.detectEnvironment();
}
detectEnvironment() {
if (typeof Deno !== 'undefined') return 'deno';
if (typeof Bun !== 'undefined') return 'bun';
if (typeof window !== 'undefined') return 'browser';
if (typeof global !== 'undefined' && typeof require !== 'undefined') return 'node';
if (typeof WorkerGlobalScope !== 'undefined') return 'worker';
return 'unknown';
}
// Universal module loading
async load(modulePath, options = {}) {
const resolvedPath = this.resolvePath(modulePath, options);
const cacheKey = resolvedPath + JSON.stringify(options);
// Return cached module if available
if (this.options.cache && this.moduleCache.has(cacheKey)) {
return this.moduleCache.get(cacheKey);
}
// Return existing loading promise to avoid duplicate loads
if (this.loadingPromises.has(cacheKey)) {
return this.loadingPromises.get(cacheKey);
}
// Create loading promise
const loadingPromise = this.loadModule(resolvedPath, options);
this.loadingPromises.set(cacheKey, loadingPromise);
try {
const module = await loadingPromise;
if (this.options.cache) {
this.moduleCache.set(cacheKey, module);
}
return module;
} finally {
this.loadingPromises.delete(cacheKey);
}
}
async loadModule(modulePath, options = {}) {
switch (this.environment) {
case 'browser':
return await this.loadBrowserModule(modulePath, options);
case 'node':
return await this.loadNodeModule(modulePath, options);
case 'deno':
return await this.loadDenoModule(modulePath, options);
case 'bun':
return await this.loadBunModule(modulePath, options);
case 'worker':
return await this.loadWorkerModule(modulePath, options);
default:
return await this.loadGenericModule(modulePath, options);
}
}
async loadBrowserModule(modulePath, options = {}) {
if (modulePath.startsWith('http') || modulePath.startsWith('/')) {
// ES module import
try {
return await import(modulePath);
} catch {
// Fallback to script tag loading
return await this.loadScript(modulePath, options);
}
} else {
// Try CDN loading for npm packages
const cdnUrl = this.toCdnUrl(modulePath);
return await import(cdnUrl);
}
}
async loadNodeModule(modulePath) {
if (typeof require !== 'undefined') {
try {
return require(modulePath);
} catch {
// Try dynamic import for ES modules
return await import(modulePath);
}
} else {
return await import(modulePath);
}
}
async loadDenoModule(modulePath) {
// Deno supports direct URLs and npm: specifier
if (modulePath.startsWith('npm:')) {
return await import(modulePath);
} else if (modulePath.startsWith('http')) {
return await import(modulePath);
} else {
// Convert to npm: specifier
return await import(`npm:${modulePath}`);
}
}
async loadBunModule(modulePath) {
// Bun supports both require and import
try {
return await import(modulePath);
} catch (error) {
if (typeof require !== 'undefined') {
return require(modulePath);
}
throw error;
}
}
async loadWorkerModule(modulePath) {
// Worker environments typically support import
return await import(modulePath);
}
async loadGenericModule(modulePath) {
// Generic fallback using dynamic import
return await import(modulePath);
}
async loadScript(src, options = {}) {
return new Promise((resolve, reject) => {
const script = document.createElement('script');
script.type = 'module';
script.src = src;
script.onload = () => {
// For script tags, we need to get the module from window or a registry
const moduleName = options.globalName || this.getModuleNameFromPath(src);
const module = window[moduleName] || {};
resolve(module);
};
script.onerror = () => reject(new Error(`Failed to load script: ${src}`));
document.head.appendChild(script);
});
}
resolvePath(modulePath, options = {}) {
// Handle absolute URLs
if (modulePath.startsWith('http://') || modulePath.startsWith('https://')) {
return modulePath;
}
// Handle relative paths
if (modulePath.startsWith('./') || modulePath.startsWith('../')) {
return this.resolveRelativePath(modulePath, options.baseUrl || this.options.baseUrl);
}
// Check module map
if (this.options.moduleMap[modulePath]) {
return this.options.moduleMap[modulePath];
}
// Default resolution
return this.options.baseUrl + modulePath;
}
resolveRelativePath(relativePath, baseUrl) {
if (!baseUrl) return relativePath;
const base = new URL(baseUrl, location?.href || 'file:///');
const resolved = new URL(relativePath, base);
return resolved.href;
}
toCdnUrl(packageName, version = 'latest') {
// Convert npm package to CDN URL
const _cleanName = packageName.replace(/^@/, '').replace('/', '-');
return `https://unpkg.com/${packageName}@${version}/dist/index.js`;
}
getModuleNameFromPath(path) {
const filename = path.split('/').pop().split('.')[0];
return filename.replace(/[-_]/g, '');
}
// Batch loading
async loadAll(modulePaths, options = {}) {
const loadPromises = modulePaths.map(path =>
this.load(path, options).catch(error => ({ error, path }))
);
return await Promise.all(loadPromises);
}
// Preloading
async preload(modulePaths, options = {}) {
const preloadPromises = modulePaths.map(async path => {
try {
await this.load(path, { ...options, preload: true });
return { success: true, path };
} catch (error) {
return { success: false, path, error };
}
});
return await Promise.all(preloadPromises);
}
// Cache management
clearCache() {
this.moduleCache.clear();
}
getCacheStats() {
return {
size: this.moduleCache.size,
modules: Array.from(this.moduleCache.keys())
};
}
// Environment detection helpers
static isSupported() {
return (() => { try { return typeof Function('return import("")') === 'function'; } catch { return false; } })() || typeof require !== 'undefined';
}
static getCapabilities() {
return {
dynamicImport: (() => { try { return typeof Function('return import("")') === 'function'; } catch { return false; } })(),
require: typeof require !== 'undefined',
fetch: typeof fetch !== 'undefined',
worker: typeof Worker !== 'undefined',
environment: new UniversalLoader().environment
};
}
}
// Factory function
export function createLoader(options = {}) {
return new UniversalLoader(options);
}
// Default instance
export const universalLoader = new UniversalLoader();
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