From 35acf07c308ce8030aaf0ad1bbb10f565608f35e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=E2=9D=A4=EF=B8=8F=20=E2=98=AE=EF=B8=8F=20=E2=9C=8B?=
 <6723574+louisgv@users.noreply.github.com>
Date: Wed, 28 Jun 2023 20:15:40 -0700
Subject: [PATCH] fix: firefox bgsw parsing bug

---
 .../parcel-transformer-manifest/src/handle-background.ts    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/parcel-transformer-manifest/src/handle-background.ts b/packages/parcel-transformer-manifest/src/handle-background.ts
index 945f6cc73..047e04275 100644
--- a/packages/parcel-transformer-manifest/src/handle-background.ts
+++ b/packages/parcel-transformer-manifest/src/handle-background.ts
@@ -41,8 +41,10 @@ function handleMV3Background(program: MV3Data) {
 
 function handleFirefoxMV3Background(program: MV3Data) {
   const mv2Program = program as unknown as MV2Data
-  mv2Program.background.scripts = [program.background.service_worker]
-  delete program.background.service_worker
+  if (program.background?.service_worker) {
+    mv2Program.background.scripts = [program.background.service_worker]
+    delete program.background.service_worker
+  }
 
   handleMV2BackgroundScript(mv2Program)
   handleMV3HotCsp(program)