refactor: use Babel AST for root barrel generation

Refactored the barrel file generation to use Babel AST via the new
generateRootBarrel() function in barrel.ts, for consistency with
the rest of the codebase.

Author: pyramation

graphql/codegen/src/core/codegen/barrel.ts

@@ -192,6 +192,45 @@ export function generateMainBarrel(
   return generateCode(statements);
 }
 
+// ============================================================================
+// Root barrel for unified output
+// ============================================================================
+
+export interface RootBarrelOptions {
+  hasTypes?: boolean;
+  hasHooks?: boolean;
+  hasOrm?: boolean;
+}
+
+/**
+ * Generate the root index.ts barrel file for the output directory.
+ * Re-exports from subdirectories based on which generators are enabled.
+ */
+export function generateRootBarrel(options: RootBarrelOptions = {}): string {
+  const { hasTypes = false, hasHooks = false, hasOrm = false } = options;
+  const statements: t.Statement[] = [];
+
+  if (hasTypes) {
+    statements.push(exportAllFrom('./types'));
+  }
+  if (hasHooks) {
+    statements.push(exportAllFrom('./hooks'));
+  }
+  if (hasOrm) {
+    statements.push(exportAllFrom('./orm'));
+  }
+
+  // Add file header as leading comment on first statement
+  if (statements.length > 0) {
+    addJSDocComment(statements[0], [
+      'Generated SDK - auto-generated, do not edit',
+      '@generated by @constructive-io/graphql-codegen',
+    ]);
+  }
+
+  return generateCode(statements);
+}
+
 // ============================================================================
 // Custom operation barrels (includes both table and custom hooks)
 // ============================================================================

graphql/codegen/src/core/generate.ts

@@ -9,6 +9,7 @@ import path from 'path';
 import { createSchemaSource, validateSourceOptions } from './introspect';
 import { runCodegenPipeline, validateTablesFound } from './pipeline';
 import { generate as generateReactQueryFiles } from './codegen';
+import { generateRootBarrel } from './codegen/barrel';
 import { generateOrm as generateOrmFiles } from './codegen/orm';
 import { generateSharedTypes } from './codegen/shared';
 import { writeGeneratedFiles } from './output';
@@ -197,23 +198,11 @@ export async function generate(options: GenerateOptions = {}): Promise<GenerateR
   // Generate barrel file at output root
   // This re-exports from the appropriate subdirectories based on which generators are enabled
   if (!options.dryRun) {
-    const exports: string[] = [];
-    if (bothEnabled) {
-      exports.push("export * from './types';");
-    }
-    if (runReactQuery) {
-      exports.push("export * from './hooks';");
-    }
-    if (runOrm) {
-      exports.push("export * from './orm';");
-    }
-
-    const barrelContent = `/**
- * Generated SDK - auto-generated, do not edit
- * @generated by @constructive-io/graphql-codegen
- */
-${exports.join('\n')}
-`;
+    const barrelContent = generateRootBarrel({
+      hasTypes: bothEnabled,
+      hasHooks: runReactQuery,
+      hasOrm: runOrm,
+    });
     await writeGeneratedFiles([{ path: 'index.ts', content: barrelContent }], outputRoot, []);
   }