From 73652a723bc6b40f5ecee7edaad89edd67c49b5c Mon Sep 17 00:00:00 2001
From: Jonah Williams <jonahwilliams@google.com>
Date: Wed, 16 Sep 2020 17:16:58 -0700
Subject: [PATCH] [flutter_tools] automatically update to latest sw on install
 (#65784)

If a new service worker is installed, automatically update this behind the scenes. Immediately after a page refresh, the new worker and cache will be available, though the main.dart.js and others will be available sooner due to the cache busting URLS
---
 .../lib/src/build_system/targets/web.dart           | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/packages/flutter_tools/lib/src/build_system/targets/web.dart b/packages/flutter_tools/lib/src/build_system/targets/web.dart
index 773eb808e9b..cdf866b4d45 100644
--- a/packages/flutter_tools/lib/src/build_system/targets/web.dart
+++ b/packages/flutter_tools/lib/src/build_system/targets/web.dart
@@ -476,6 +476,7 @@ const CORE = [
   ${coreBundle.map((String file) => '"$file"').join(',\n')}];
 // During install, the TEMP cache is populated with the application shell files.
 self.addEventListener("install", (event) => {
+  skipWaiting();
   return event.waitUntil(
     caches.open(TEMP).then((cache) => {
       return cache.addAll(
@@ -579,10 +580,12 @@ self.addEventListener('message', (event) => {
   // SkipWaiting can be used to immediately activate a waiting service worker.
   // This will also require a page refresh triggered by the main worker.
   if (event.data === 'skipWaiting') {
-    return self.skipWaiting();
+    skipWaiting();
+    return;
   }
-  if (event.message === 'downloadOffline') {
+  if (event.data === 'downloadOffline') {
     downloadOffline();
+    return;
   }
 });
 
@@ -628,5 +631,11 @@ function onlineFirst(event) {
     })
   );
 }
+
+function skipWaiting() {
+  if (self.skipWaiting != undefined) {
+    self.skipWaiting();
+  }
+}
 ''';
 }