firebase-messaging.js broken on iOS Safari 9

[dimanux]

[REQUIRED] Describe your environment

• Operating System version: iOS 9.3.5 / iPad 2
• Browser version: Safari
• Firebase SDK version: 5.5.0
• Firebase Product: messaging

[REQUIRED] Describe the problem

I included firebase-app.js and firebase-messaging.js at index.html. The firebase-app.js script was loaded ok, but firebase-messaging.js has error "Strict mode does not allow function declarations in a lexically nested statement". Here is the screenshot of the error from MacOS Web Inspector:

Here is the screenshot of the same error but with javascript code beautifier:

[Feiyang1]

It's the same issue as #931 . Closing this one.

[ecreatures]

We're using firebase messaging with version 5.5.4 in a vue project and Safari 11.1.2 is broken also.
The erros raised is :
"FirebaseError: Messaging: This browser doesn't support the API's required to use the firebase SDK. (messaging/unsupported-browser)."
=>and a blank page is displayed
Same error on Safari IOS

[Feiyang1]

@ecreatures It looks like a different issue. Firebase messaging does browser compatibility checks before initializing itself, Safari 11.1.2 is probably missing some feature messaging requires. Can you please open a new issue, so I can route to the appropriate person to answer your question?