From bc6b28cf8d2a60b834c1ea0198925389ad5ee807 Mon Sep 17 00:00:00 2001
From: Edward Faulkner <ef@alum.mit.edu>
Date: Tue, 9 Feb 2021 16:32:03 -0500
Subject: [PATCH] accidental duplication of babel plugin list

---
 packages/core/src/app.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/app.ts b/packages/core/src/app.ts
index 96ee80170..57d727dc8 100644
--- a/packages/core/src/app.ts
+++ b/packages/core/src/app.ts
@@ -335,7 +335,7 @@ export class AppBuilder<TreeNames> {
 
   @Memoize()
   private babelConfig(templateCompilerParams: TemplateCompilerParams, appFiles: Engine[]) {
-    let babel = this.adapter.babelConfig();
+    let babel = cloneDeep(this.adapter.babelConfig());
 
     if (!babel.plugins) {
       babel.plugins = [];