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* Module Resolver - Universal module path resolution and mapping
* Handles different module systems and environments
*/
import { detectRuntime, RuntimeEnvironment } from './runtime-detector.js';
export class ModuleResolver {
constructor(options = {}) {
this.options = {
baseUrl: '',
paths: {},
aliases: {},
extensions: ['.js', '.mjs', '.cjs', '.ts', '.jsx', '.tsx'],
moduleMap: {},
cdnTemplate: 'https://unpkg.com/{name}@{version}/{path}',
fallbacks: [],
...options
};
this.environment = detectRuntime();
this.resolutionCache = new Map();
}
// Main resolution method
resolve(modulePath, context = {}) {
const cacheKey = this.getCacheKey(modulePath, context);
if (this.resolutionCache.has(cacheKey)) {
return this.resolutionCache.get(cacheKey);
}
const resolved = this.doResolve(modulePath, context);
this.resolutionCache.set(cacheKey, resolved);
return resolved;
}
doResolve(modulePath, context = {}) {
// Handle different module path types
const pathInfo = this.analyzePath(modulePath);
switch (pathInfo.type) {
case 'absolute':
return this.resolveAbsolute(pathInfo, context);
case 'relative':
return this.resolveRelative(pathInfo, context);
case 'package':
return this.resolvePackage(pathInfo, context);
case 'alias':
return this.resolveAlias(pathInfo, context);
case 'mapped':
return this.resolveMapped(pathInfo, context);
default:
throw new Error(`Unable to resolve module: ${modulePath}`);
}
}
analyzePath(modulePath) {
// Absolute URLs
if (/^https?:\/\//.test(modulePath)) {
return { type: 'absolute', path: modulePath, original: modulePath };
}
// File protocol
if (modulePath.startsWith('file://')) {
return { type: 'absolute', path: modulePath, original: modulePath };
}
// Relative paths
if (modulePath.startsWith('./') || modulePath.startsWith('../')) {
return { type: 'relative', path: modulePath, original: modulePath };
}
// Check for mapped paths
if (this.options.moduleMap[modulePath]) {
return {
type: 'mapped',
path: modulePath,
mapped: this.options.moduleMap[modulePath],
original: modulePath
};
}
// Check for aliases
const aliasKey = Object.keys(this.options.aliases).find(alias =>
modulePath.startsWith(`${alias }/`) || modulePath === alias
);
if (aliasKey) {
return {
type: 'alias',
path: modulePath,
alias: aliasKey,
remainder: modulePath.slice(aliasKey.length + 1),
original: modulePath
};
}
// Package imports
return { type: 'package', path: modulePath, original: modulePath };
}
resolveAbsolute(pathInfo) {
return {
resolved: pathInfo.path,
type: 'absolute',
original: pathInfo.original
};
}
resolveRelative(pathInfo, context) {
let baseUrl = context.baseUrl || this.options.baseUrl || '';
// Use current location in browsers
if (this.environment === RuntimeEnvironment.BROWSER && !baseUrl) {
baseUrl = window.location.href;
}
if (!baseUrl) {
throw new Error(`Cannot resolve relative path "${pathInfo.path}" without base URL`);
}
const resolved = new URL(pathInfo.path, baseUrl).href;
return {
resolved,
type: 'relative',
original: pathInfo.original,
baseUrl
};
}
resolvePackage(pathInfo, context) {
const packageName = this.parsePackageName(pathInfo.path);
// Try different resolution strategies based on environment
switch (this.environment) {
case RuntimeEnvironment.BROWSER:
return this.resolveBrowserPackage(packageName, context);
case RuntimeEnvironment.NODE:
return this.resolveNodePackage(packageName, context);
case RuntimeEnvironment.DENO:
return this.resolveDenoPackage(packageName, context);
case RuntimeEnvironment.BUN:
return this.resolveBunPackage(packageName, context);
case RuntimeEnvironment.CLOUDFLARE:
case RuntimeEnvironment.EDGE:
return this.resolveEdgePackage(packageName, context);
default:
return this.resolveGenericPackage(packageName, context);
}
}
parsePackageName(modulePath) {
const parts = modulePath.split('/');
if (modulePath.startsWith('@')) {
// Scoped package
return {
name: `${parts[0]}/${parts[1]}`,
subpath: parts.slice(2).join('/'),
scope: parts[0],
packageName: parts[1]
};
} else {
// Regular package
return {
name: parts[0],
subpath: parts.slice(1).join('/'),
scope: null,
packageName: parts[0]
};
}
}
resolveBrowserPackage(packageInfo, context) {
// Try CDN resolution first
const cdnUrl = this.resolveToCdn(packageInfo, context);
return {
resolved: cdnUrl,
type: 'package',
strategy: 'cdn',
original: packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : ''),
package: packageInfo
};
}
resolveNodePackage(packageInfo) {
// Node.js resolution - return as-is for require/import to handle
const modulePath = packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : '');
return {
resolved: modulePath,
type: 'package',
strategy: 'node',
original: modulePath,
package: packageInfo
};
}
resolveDenoPackage(packageInfo) {
// Use npm: specifier for Deno
const modulePath = `npm:${ packageInfo.name }${packageInfo.subpath ? `/${ packageInfo.subpath}` : ''}`;
return {
resolved: modulePath,
type: 'package',
strategy: 'deno-npm',
original: packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : ''),
package: packageInfo
};
}
resolveBunPackage(packageInfo) {
// Bun can handle npm packages directly
const modulePath = packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : '');
return {
resolved: modulePath,
type: 'package',
strategy: 'bun',
original: modulePath,
package: packageInfo
};
}
resolveEdgePackage(packageInfo, context) {
// Edge environments typically use CDN or bundled modules
const cdnUrl = this.resolveToCdn(packageInfo, context);
return {
resolved: cdnUrl,
type: 'package',
strategy: 'edge-cdn',
original: packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : ''),
package: packageInfo
};
}
resolveGenericPackage(packageInfo) {
// Generic fallback
const modulePath = packageInfo.name + (packageInfo.subpath ? `/${ packageInfo.subpath}` : '');
return {
resolved: modulePath,
type: 'package',
strategy: 'generic',
original: modulePath,
package: packageInfo
};
}
resolveToCdn(packageInfo, context = {}) {
const version = context.version || 'latest';
const subpath = packageInfo.subpath || 'dist/index.js';
return this.options.cdnTemplate
.replace('{name}', packageInfo.name)
.replace('{version}', version)
.replace('{path}', subpath);
}
resolveAlias(pathInfo, context) {
const aliasTarget = this.options.aliases[pathInfo.alias];
const resolvedPath = pathInfo.remainder
? `${aliasTarget}/${pathInfo.remainder}`
: aliasTarget;
// Recursively resolve the aliased path
const resolved = this.doResolve(resolvedPath, context);
return {
...resolved,
type: 'alias',
alias: pathInfo.alias,
aliasTarget,
original: pathInfo.original
};
}
resolveMapped(pathInfo, context) {
const mapped = pathInfo.mapped;
// If mapped value is a function, call it
if (typeof mapped === 'function') {
const result = mapped(pathInfo.path, context);
return {
resolved: result,
type: 'mapped',
original: pathInfo.original,
mapFunction: true
};
}
// Static mapping
return {
resolved: mapped,
type: 'mapped',
original: pathInfo.original
};
}
// Path utilities
addExtension(path, extensions = null) {
const exts = extensions || this.options.extensions;
// Already has extension
if (exts.some(ext => path.endsWith(ext))) {
return path;
}
// Add default extension
return path + exts[0];
}
stripExtension(path) {
const ext = this.options.extensions.find(e => path.endsWith(e));
return ext ? path.slice(0, -ext.length) : path;
}
isRelative(path) {
return path.startsWith('./') || path.startsWith('../');
}
isAbsolute(path) {
return /^https?:\/\//.test(path) || path.startsWith('file://');
}
// Configuration methods
addAlias(alias, target) {
this.options.aliases[alias] = target;
this.clearCache();
}
addMapping(from, to) {
this.options.moduleMap[from] = to;
this.clearCache();
}
setBaseUrl(baseUrl) {
this.options.baseUrl = baseUrl;
this.clearCache();
}
setCdnTemplate(template) {
this.options.cdnTemplate = template;
this.clearCache();
}
// Path patterns and wildcards
resolvePattern(pattern, replacements = {}) {
let resolved = pattern;
Object.entries(replacements).forEach(([key, value]) => {
resolved = resolved.replace(new RegExp(`\\{${key}\\}`, 'g'), value);
});
return resolved;
}
// Batch resolution
resolveAll(modulePaths, context = {}) {
return modulePaths.map(path => {
try {
return { path, resolution: this.resolve(path, context), success: true };
} catch (error) {
return { path, error, success: false };
}
});
}
// Cache management
getCacheKey(modulePath, context) {
return `${modulePath}::${JSON.stringify(context)}`;
}
clearCache() {
this.resolutionCache.clear();
}
getCacheStats() {
return {
size: this.resolutionCache.size,
keys: Array.from(this.resolutionCache.keys())
};
}
// Validation
validateResolution(resolution) {
if (!resolution || !resolution.resolved) {
return { valid: false, error: 'Invalid resolution object' };
}
// Additional validation based on type
switch (resolution.type) {
case 'absolute':
if (!this.isAbsolute(resolution.resolved)) {
return { valid: false, error: 'Absolute resolution must be a valid URL' };
}
break;
case 'relative':
if (!resolution.baseUrl) {
return { valid: false, error: 'Relative resolution must include baseUrl' };
}
break;
}
return { valid: true };
}
// Debug utilities
debug(modulePath, context = {}) {
const pathInfo = this.analyzePath(modulePath);
const resolution = this.resolve(modulePath, context);
const validation = this.validateResolution(resolution);
return {
input: modulePath,
context,
pathInfo,
resolution,
validation,
environment: this.environment,
options: this.options
};
}
}
// Factory function
export function createModuleResolver(options = {}) {
return new ModuleResolver(options);
}
// Default resolver instance
export const moduleResolver = new ModuleResolver();
// Convenience functions
export function resolveModule(modulePath, context = {}) {
return moduleResolver.resolve(modulePath, context);
}
export function addAlias(alias, target) {
return moduleResolver.addAlias(alias, target);
}
export function addMapping(from, to) {
return moduleResolver.addMapping(from, to);
}
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