From 64e6a32ce845aa1adf00f29be764c9e0678cca06 Mon Sep 17 00:00:00 2001
From: Matthias Kretschmann <m@kretschmann.io>
Date: Sat, 9 Nov 2019 20:08:57 +0100
Subject: [PATCH] Display a message when a service worker updates

---
 gatsby-browser.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gatsby-browser.js b/gatsby-browser.js
index 80bfcec0..53866174 100644
--- a/gatsby-browser.js
+++ b/gatsby-browser.js
@@ -4,3 +4,15 @@ import './src/styles/global.scss'
 if (typeof window.IntersectionObserver === 'undefined') {
   import('intersection-observer')
 }
+
+// Display a message when a service worker updates
+// https://www.gatsbyjs.org/docs/add-offline-support-with-a-service-worker/#displaying-a-message-when-a-service-worker-updates
+export const onServiceWorkerUpdateReady = () => {
+  const answer = window.confirm(
+    `This application has been updated. ` +
+      `Reload to display the latest version?`
+  )
+  if (answer === true) {
+    window.location.reload()
+  }
+}