Feat: Add robust Transpiler/Bundler test

tests/4_transpiler/test.js

@@ -0,0 +1,65 @@
+export default {
+  functionName: 'bundleApp',
+  prompt: `// Write an async JavaScript function 'bundleApp' that acts as a mini-bundler for ES6 modules.
+// - Input: 'entryFile' (string, e.g., 'main.js') and 'files' (object: { 'filename.js': 'code content' }).
+// - You MUST use dynamic import() to load '@babel/standalone' from a CDN.
+// - Process:
+//   1. Recursively traverse dependencies starting from 'entryFile'.
+//   2. Use Babel to transform each file's code from ES6+ to CommonJS (presets: ['env']).
+//   3. Extract dependencies from the transformed code (look for 'require' calls).
+//   4. Build a dependency graph. Throw an error if a file is missing.
+// - Output: Return a single string of executable JavaScript code.
+//   - This code must contain a lightweight runtime that defines 'require', 'module', and 'exports'.
+//   - It must wrap each module's code in a function.
+//   - When executed (e.g., via eval), it should run the entry file and return its 'module.exports'.
+// - The runtime must handle relative paths (e.g., './utils.js') correctly during resolution.
+// - Ensure the generated code is self-contained and does not pollute the global scope.`,
+  runTest: async (bundleApp) => {
+    const assert = {
+      strictEqual: (a, e, m) => { if (a !== e) throw new Error(m || `FAIL: ${a} !== ${e}`) },
+      ok: (v, m) => { if (!v) throw new Error(m) }
+    };
+
+    const files = {
+      'main.js': `
+        import { add, multiply } from './math.js';
+        import { format } from './utils/formatter.js';
+        
+        const sum = add(5, 3);
+        const prod = multiply(2, 4);
+        
+        export const result = format(sum + prod);
+      `,
+      'math.js': `
+        export const add = (a, b) => a + b;
+        export const multiply = (a, b) => a * b;
+      `,
+      'utils/formatter.js': `
+        export const format = (n) => \`Value: \${n}\`;
+      `
+    };
+
+    // 1. Test successful bundling
+    const bundle = await bundleApp('main.js', files);
+    assert.ok(typeof bundle === 'string', 'Result must be a string');
+    assert.ok(bundle.length > 100, 'Bundle seems too short');
+    assert.ok(!bundle.includes('import '), 'Bundle should not contain ES6 import statements');
+
+    // 2. Test execution of the bundle
+    // We wrap in an IIFE to ensure it returns the exports
+    const result = eval(bundle);
+    
+    // Check if result matches expected logic: (5+3) + (2*4) = 8 + 8 = 16 -> "Value: 16"
+    assert.ok(result && typeof result === 'object', 'Bundle execution should return module.exports object');
+    assert.strictEqual(result.result, 'Value: 16', 'Logic execution failed');
+
+    // 3. Test Missing File Error
+    const brokenFiles = { 'main.js': "import './missing.js';" };
+    try {
+      await bundleApp('main.js', brokenFiles);
+      throw new Error('Should have thrown on missing file');
+    } catch (e) {
+      assert.ok(e.message.toLowerCase().includes('missing') || e.message.includes('found'), 'Error message should mention missing file');
+    }
+  }
+};