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I followed these guides to add pwa support and host my ionic v4 app:

• https://www.joshmorony.com/create-a-pwa-with-angular-service-workers-in-ionic-4/


• https://www.joshmorony.com/hosting-an-ionic-pwa-with-firebase-hosting/

The app loads fine in Safari, and I can also add the app to my home screen (ios). However, from the home screen, the app does not bootstrap when launched.

If I go to Safari DevTools and reload the page after launch, the app is just fine.

I'm also not exactly clear on the minimum requirements for a pwa. My app loads the google maps javascript api on launch, so it doesn't really work without a network connection. I'm not sure if that is part of the problem or not.

ionic info

Ionic:

 ionic (Ionic CLI) : 4.3.1 (/Users/m/.nvm/versions/node/v8.9.4/lib/node_modules/ionic)
 Ionic Framework : @ionic/angular 4.0.0-beta.15
 @angular-devkit/build-angular : 0.8.7
 @angular-devkit/schematics : 0.8.7
 @angular/cli : 7.0.5
 @ionic/angular-toolkit : 1.1.0

Capacitor:

 capacitor (Capacitor CLI) : 1.0.0-beta.7
 @capacitor/core : 1.0.0-beta.7

Cordova:

 cordova (Cordova CLI) : 8.0.0
 Cordova Platforms : ios 4.5.5
 Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.1.4, (and 10 other plugins)

System:

 ios-deploy : 2.0.0
 NodeJS : v8.9.4 (/Users/m/.nvm/versions/node/v8.9.4/bin/node)
 npm : 6.4.1
 OS : macOS High Sierra
 Xcode : Xcode 10.0 Build version 10A255

on reload of the pwa app from DevTools, I see this error:

[Error] ERROR
Error: Uncaught (in promise): SecurityError: MIME Type is not a JavaScript MIME type
 vt (main.0c301dd161ca4cc6d73d.js:1:123807)
 handleError (main.0c301dd161ca4cc6d73d.js:1:124014)
 next (main.0c301dd161ca4cc6d73d.js:1:139466)
 (anonymous function) (main.0c301dd161ca4cc6d73d.js:1:131304)
 __tryOrUnsub (main.0c301dd161ca4cc6d73d.js:1:247187)
 next (main.0c301dd161ca4cc6d73d.js:1:246340)
 _next (main.0c301dd161ca4cc6d73d.js:1:245384)
 next (main.0c301dd161ca4cc6d73d.js:1:245056)
 next (main.0c301dd161ca4cc6d73d.js:1:272048)
 emit (main.0c301dd161ca4cc6d73d.js:1:131085)
 run (polyfills.0548e3ebf74d8c45f01b.js:1:2461)
 onHandleError (main.0c301dd161ca4cc6d73d.js:1:133065)
 runGuarded (polyfills.0548e3ebf74d8c45f01b.js:1:2721)
 e (polyfills.0548e3ebf74d8c45f01b.js:1:11589)
 microtaskDrainDone (polyfills.0548e3ebf74d8c45f01b.js:1:11638)
 d (polyfills.0548e3ebf74d8c45f01b.js:1:10261)
 promiseReactionJob

It seems like it should be related to Angular ServiceWorkers + MIME type error, but I'm using ionic build --prod; firebase deploy and the build output is all minimized.

Here's the network log when I launch the App from Home screen:

And here's what it looks like after I click reload in DevTools

I'm using this as a workaround for now:

 async patch_PWA_bootstrap()
 const RELOAD_LIMIT = 5000
 const el = document.getElementsByTagName('HTML')[0];
 const now = Date.now();
 if (el.classList.contains('plt-pwa'))
 const resp = await Storage.get(key:'PWA_RELOAD');
 if ( now - JSON.parse(resp.value) < RELOAD_LIMIT) 
 return; // wait at before next reload

 const cancel = setTimeout( async ()=>
 // something not bootstrapping correctly with pwa. reload() fixes
 await Storage.set(key:'PWA_RELOAD', value:JSON.stringify(now));
 window.location.reload();
 ,100)
 
 

I'm calling it when the PWA app loads and when it returns to foreground