From d535052303d95ced56bd2488aecef288ee12e872 Mon Sep 17 00:00:00 2001
From: Lisa Backer <lisa.backer@dockyard.com>
Date: Tue, 6 Nov 2018 11:42:34 -0500
Subject: [PATCH] Ensure existing babel options are preserved when compiling

---
 lib/service-worker-builder.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/service-worker-builder.js b/lib/service-worker-builder.js
index 3dd53e5..79e2a86 100644
--- a/lib/service-worker-builder.js
+++ b/lib/service-worker-builder.js
@@ -116,6 +116,8 @@ module.exports = class ServiceWorkerBuilder {
 
   _babelTranspile(tree) {
     let emberCliBabel = this.app.project.addons.filter((a) => a.name === 'ember-cli-babel')[0];
-    return emberCliBabel.transpileTree(tree, { 'ember-cli-babel': { compileModules: false } });
+    let options = emberCliBabel.buildBabelOptions();
+    options.compileModules = false;
+    return emberCliBabel.transpileTree(tree, { 'ember-cli-babel': options });
   }
 }