Prebid.js gives error on some iphone models such as 11

[opskn]

Type of issue

Prebid.js gives error on some iphone models such as 11

Description

Hello,
Prebid.js version created from prebid.org website gives error on some iphone models such as 11 or 8
When I try to debug error, I can't. Because I can not see in developer console. When I open by clicking error message, nothing happnes instead og going error source.

Steps to reproduce

I created very basic blank page for testing.
https://pigeoon-native.b-cdn.net/common/v8/prebid.html
You can also create blank html page and paste belowed code into html page

<script async src="https://pigeoon-native.b-cdn.net/common/v8/prebid9.20.0.js"></script>

If you test with "BrowserStack" on iPhone 11 chrome or safari you can see error on console

Test page

https://pigeoon-native.b-cdn.net/common/v8/prebid.html

Expected results

Gives error
SyntaxError: Unexpected token '?'

Actual results

Platform details

Other information

[opskn]

If anyone can help I would be very happy

[patmmccann]

https://browserslist.dev/?q=Pi4xOSU%3D we use > .25% for the version on the download page; it is adjusted here

Prebid.js/package.json

Line 30 in b3577cc

"> 0.25%",

. You're welcome to change that value before building your package. 0.19 captures Safari 12+

Do you find iphone 11 with safari belowe 13.4 is popular?

[dgirardi]

To elaborate: the error is due to the browser not supporting some JS features; for example ?? is supported from IOS 13.4, and the iphone 11 available on Browserstack is running 13.1. I am not an iphone user so I don't know if that means that "real" devices are stuck on that version - an OS update would solve the issue.

We compile against browsers that have at least 0.25% market share and the earliest IOS version that passes that test is 15.6. You can adjust that as @patmmccann mentioned.

[opskn]

Thank you @patmmccann and @dgirardi

This was very helpful information. It works!

Actually you're right. But one of our manager noticed this situation.

Thanks a lot again