79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
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/**
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* Custom ESM Loader that adds .js extensions to imports without extensions
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*/
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import { resolve as pathResolve, dirname, extname, isAbsolute } from 'node:path';
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import { fileURLToPath, pathToFileURL } from 'node:url';
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import { existsSync } from 'node:fs';
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/**
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* Resolve hook - adds .js extension to imports without extensions
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*/
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export async function resolve(specifier, context, nextResolve) {
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// Log everything unconditionally
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console.log(`[loader] resolve called: ${specifier}`);
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// Skip node built-ins and package imports
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if (specifier.startsWith('node:') || specifier.startsWith('@') || !specifier.includes('/')) {
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return nextResolve(specifier, context);
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}
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// Check if specifier needs .js extension added
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if (!extname(specifier)) {
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// Calculate the absolute path
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let absolutePath;
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if (isAbsolute(specifier)) {
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absolutePath = specifier;
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} else if (specifier.startsWith('./') || specifier.startsWith('../')) {
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// For relative imports, resolve from parent directory
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const { parentURL } = context;
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let parentDir;
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if (parentURL) {
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try {
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parentDir = dirname(fileURLToPath(parentURL));
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} catch {
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parentDir = process.cwd();
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}
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} else {
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parentDir = process.cwd();
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}
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absolutePath = pathResolve(parentDir, specifier);
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} else {
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// Not a path we handle
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return nextResolve(specifier, context);
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}
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console.log(`[loader] absolute path: ${absolutePath}`);
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// Try adding .js extension
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const pathWithJs = absolutePath + '.js';
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console.log(`[loader] trying: ${pathWithJs}, exists: ${existsSync(pathWithJs)}`);
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if (existsSync(pathWithJs)) {
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const url = pathToFileURL(pathWithJs).href;
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console.log(`[loader] resolved to: ${url}`);
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return {
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shortCircuit: true,
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url,
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};
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}
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// Try as directory with index.js
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const pathAsIndex = pathResolve(absolutePath, 'index.js');
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console.log(`[loader] trying index: ${pathAsIndex}, exists: ${existsSync(pathAsIndex)}`);
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if (existsSync(pathAsIndex)) {
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const url = pathToFileURL(pathAsIndex).href;
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console.log(`[loader] resolved to: ${url}`);
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return {
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shortCircuit: true,
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url,
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};
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}
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}
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// Default resolution
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return nextResolve(specifier, context);
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}
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