Not working in the lower version of Safari

[Sphinm]

What is the current behavior?

Hello, I found that it cannot be used in the lower version of Safari ios browser. After debugging, it was found that the syntax error was reported, and it was located that it was a problem with the react-turnstile library. The reason is that the ?? syntactic sugar is still used in the build product. The minimum valid version of this syntax in Safari ios is 13.4. If it is lower than this version, an error will be reported.

I tried forking the code to modify the unbuild configuration, but I'm not familiar with how to configure commonjs in this library, so it never took effect. I hope you can help me deal with it. Thank you so much.