From 32c4285869a9c6b1accb6800659775c76f110ba9 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Thu, 4 Oct 2018 21:07:55 -0400
Subject: [PATCH 1/2] avoid TypeError on when registering service workers
 without config

Fixes #5299
---
 packages/react-scripts/template/src/serviceWorker.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-scripts/template/src/serviceWorker.js b/packages/react-scripts/template/src/serviceWorker.js
index 8859a0c6b20..a0153cb4c47 100644
--- a/packages/react-scripts/template/src/serviceWorker.js
+++ b/packages/react-scripts/template/src/serviceWorker.js
@@ -78,7 +78,7 @@ function registerValidSW(swUrl, config) {
               console.log('Content is cached for offline use.');
 
               // Execute callback
-              if (config.onSuccess) {
+              if (config && config.onSuccess) {
                 config.onSuccess(registration);
               }
             }

From d600d8c31724ef6f150ed9faf1d0eb0d28ee77e5 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Thu, 4 Oct 2018 21:10:41 -0400
Subject: [PATCH 2/2] same before config.onUpdate

---
 packages/react-scripts/template/src/serviceWorker.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-scripts/template/src/serviceWorker.js b/packages/react-scripts/template/src/serviceWorker.js
index a0153cb4c47..46c98a44037 100644
--- a/packages/react-scripts/template/src/serviceWorker.js
+++ b/packages/react-scripts/template/src/serviceWorker.js
@@ -68,7 +68,7 @@ function registerValidSW(swUrl, config) {
               console.log('New content is available; please refresh.');
 
               // Execute callback
-              if (config.onUpdate) {
+              if (config && config.onUpdate) {
                 config.onUpdate(registration);
               }
             } else {