Fixes #79 Resolved ERR_MODULE_NOT_FOUND during Vitest ESM resolution by adding explicit .js extensions to ESM imports.

fix-imports-script.mjs

@@ -0,0 +1,118 @@
+#!/usr/bin/env node
+
+/**
+ * Post-build script to fix ESM imports by adding .js extensions
+ * 
+ * This script walks through the dist directory and adds .js extensions
+ * to all relative imports to ensure compatibility with strict Node.js ESM.
+ * 
+ * Usage: node fix-imports-script.mjs [dist-directory]
+ */
+
+import { readdir, readFile, writeFile } from 'fs/promises';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+// Get dist directory from command line argument or use default
+const distDir = process.argv[2] || join(__dirname, 'node_modules', 'wallet-svelte-component', 'dist');
+
+console.log(`🔧 Fixing ESM imports in: ${distDir}\n`);
+
+let filesFixed = 0;
+let importsFixed = 0;
+
+/**
+ * Recursively process all .js files in a directory
+ */
+async function fixImportsInDirectory(dir) {
+  try {
+    const files = await readdir(dir, { withFileTypes: true });
+
+    for (const file of files) {
+      const fullPath = join(dir, file.name);
+
+      if (file.isDirectory()) {
+        await fixImportsInDirectory(fullPath);
+      } else if (file.name.endsWith('.js')) {
+        await fixImportsInFile(fullPath);
+      }
+    }
+  } catch (error) {
+    console.error(`❌ Error processing directory ${dir}:`, error.message);
+  }
+}
+
+/**
+ * Fix imports in a single JavaScript file
+ */
+async function fixImportsInFile(filePath) {
+  try {
+    let content = await readFile(filePath, 'utf-8');
+    const originalContent = content;
+    let fileImportCount = 0;
+
+    // Pattern 1: export * from './path'
+    content = content.replace(
+      /export\s+\*\s+from\s+['"](\.[^'"]+)(?<!\.js|\.svelte|\.json)['"]/g,
+      (match, path) => {
+        fileImportCount++;
+        return `export * from '${path}.js'`;
+      }
+    );
+
+    // Pattern 2: export { ... } from './path'
+    content = content.replace(
+      /export\s+{[^}]+}\s+from\s+['"](\.[^'"]+)(?<!\.js|\.svelte|\.json)['"]/g,
+      (match, path) => {
+        fileImportCount++;
+        const quote = match.includes('"') && match.lastIndexOf('"') > match.lastIndexOf("'") ? '"' : "'";
+        const exportPart = match.substring(0, match.lastIndexOf(quote));
+        return `${exportPart}${quote}${path}.js${quote}`;
+      }
+    );
+
+    // Pattern 3: import ... from './path'
+    content = content.replace(
+      /import\s+.*?from\s+['"](\.[^'"]+)(?<!\.js|\.svelte|\.json)['"]/g,
+      (match, path) => {
+        fileImportCount++;
+        const quote = match.includes('"') && match.lastIndexOf('"') > match.lastIndexOf("'") ? '"' : "'";
+        const importPart = match.substring(0, match.lastIndexOf(quote));
+        return `${importPart}${quote}${path}.js${quote}`;
+      }
+    );
+
+    // Pattern 4: import './path'
+    content = content.replace(
+      /import\s+['"](\.[^'"]+)(?<!\.js|\.svelte|\.json)['"]/g,
+      (match, path) => {
+        fileImportCount++;
+        return `import '${path}.js'`;
+      }
+    );
+
+    // Only write if changes were made
+    if (content !== originalContent) {
+      await writeFile(filePath, content, 'utf-8');
+      filesFixed++;
+      importsFixed += fileImportCount;
+      console.log(`✅ Fixed ${fileImportCount} imports in: ${filePath}`);
+    }
+  } catch (error) {
+    console.error(`❌ Error processing file ${filePath}:`, error.message);
+  }
+}
+
+// Run the script
+(async () => {
+  try {
+    console.log('Starting import fixes...\n');
+    await fixImportsInDirectory(distDir);
+    console.log(`\n🎉 Complete! Fixed ${importsFixed} imports across ${filesFixed} files.`);
+  } catch (error) {
+    console.error('❌ Script failed:', error);
+    process.exit(1);
+  }
+})();