From 6b70ec371cd5dbb14b268262b9136d34fdb3a9dc Mon Sep 17 00:00:00 2001
From: Piotr <hello@piotr.cz>
Date: Tue, 31 Oct 2017 10:26:28 +0100
Subject: [PATCH 1/2] Provide callbacks in registerServiceWorker

---
 .../template/src/registerServiceWorker.js     | 22 ++++++++++++++-----
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/packages/react-scripts/template/src/registerServiceWorker.js b/packages/react-scripts/template/src/registerServiceWorker.js
index 12542ba2295..2fdddbfb169 100644
--- a/packages/react-scripts/template/src/registerServiceWorker.js
+++ b/packages/react-scripts/template/src/registerServiceWorker.js
@@ -18,7 +18,7 @@ const isLocalhost = Boolean(
     )
 );
 
-export default function register() {
+export default function register(config) {
   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
     // The URL constructor is available in all browsers that support SW.
     const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
@@ -34,16 +34,16 @@ export default function register() {
 
       if (isLocalhost) {
         // This is running on localhost. Lets check if a service worker still exists or not.
-        checkValidServiceWorker(swUrl);
+        checkValidServiceWorker(swUrl, config);
       } else {
         // Is not local host. Just register service worker
-        registerValidSW(swUrl);
+        registerValidSW(swUrl, config);
       }
     });
   }
 }
 
-function registerValidSW(swUrl) {
+function registerValidSW(swUrl, config) {
   navigator.serviceWorker
     .register(swUrl)
     .then(registration => {
@@ -57,11 +57,21 @@ function registerValidSW(swUrl) {
               // It's the perfect time to display a "New content is
               // available; please refresh." message in your web app.
               console.log('New content is available; please refresh.');
+
+              // Execute callback
+              if (config.handleUpdate) {
+                config.handleUpdate(registration);
+              }
             } else {
               // At this point, everything has been precached.
               // It's the perfect time to display a
               // "Content is cached for offline use." message.
               console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config.handleSuccess) {
+                config.handleSuccess(registration);
+              }
             }
           }
         };
@@ -72,7 +82,7 @@ function registerValidSW(swUrl) {
     });
 }
 
-function checkValidServiceWorker(swUrl) {
+function checkValidServiceWorker(swUrl, config) {
   // Check if the service worker can be found. If it can't reload the page.
   fetch(swUrl)
     .then(response => {
@@ -89,7 +99,7 @@ function checkValidServiceWorker(swUrl) {
         });
       } else {
         // Service worker found. Proceed as normal.
-        registerValidSW(swUrl);
+        registerValidSW(swUrl, config);
       }
     })
     .catch(() => {

From d7a7b3f0c74ecce53f7defd5abc6a76f8577d980 Mon Sep 17 00:00:00 2001
From: Piotr <hello@piotr.cz>
Date: Tue, 31 Oct 2017 10:33:37 +0100
Subject: [PATCH 2/2] change callback names from handleX to onX

---
 .../react-scripts/template/src/registerServiceWorker.js   | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/react-scripts/template/src/registerServiceWorker.js b/packages/react-scripts/template/src/registerServiceWorker.js
index 2fdddbfb169..356303a3c61 100644
--- a/packages/react-scripts/template/src/registerServiceWorker.js
+++ b/packages/react-scripts/template/src/registerServiceWorker.js
@@ -59,8 +59,8 @@ function registerValidSW(swUrl, config) {
               console.log('New content is available; please refresh.');
 
               // Execute callback
-              if (config.handleUpdate) {
-                config.handleUpdate(registration);
+              if (config.onUpdate) {
+                config.onUpdate(registration);
               }
             } else {
               // At this point, everything has been precached.
@@ -69,8 +69,8 @@ function registerValidSW(swUrl, config) {
               console.log('Content is cached for offline use.');
 
               // Execute callback
-              if (config.handleSuccess) {
-                config.handleSuccess(registration);
+              if (config.onSuccess) {
+                config.onSuccess(registration);
               }
             }
           }