Hi austinblu,
What is your Google Lighthouse score for service worker with your current version of the plugin?
Can you open previously visited pages when offline?
Do you have a 500.php and an offline.php in the root folder of your theme?
I have PWA version 0.2-alpha1 installed https://github.com/xwp/pwa-wp running with WordPress 5.1 and the twentynineteen default theme.
Without the 500.php and offline.php I was getting the error “Service worker does not successfully serve the manifest’s start_url, No usable web app manifest found on page.”
I followed the fix here: https://github.com/xwp/pwa-wp/issues/115. I adapted the code
https://github.com/westonruter/twentyseventeen-westonson/blob/master/offline.php
and https://github.com/westonruter/twentyseventeen-westonson/blob/master/500.php to work with the twentynineteen theme and dropped it in my child themes folder – Google Lighthouse score now shows 100%.
When offline, it shows the offline.php, but I cannot open previously visited pages and still have to fix some css.
Best Wishes, Inge
