How can I upgrade the deprecated UTTypeCopyPreferredTagWithClass method to something iOS 16 compatible?

I'm trying to convert this deprecated bit of code into its iOS 16 compatible form:

extension URL {
    public static func pathExtensionForUTI(_ uti: String) -> String? {
        return UTTypeCopyPreferredTagWithClass(uti as CFString, kUTTagClassFilenameExtension)?.takeRetainedValue() as String?
    }
}

This is a static method on URL that returns an optional path extension string for the UTI, which is passed into the method from elsewhere.

I thought the solution would be something like this, using preferredFilenameExtension to get the path extension:

    public static func pathExtensionForUTI(_ uti: String) -> String? {
        return UTType(filenameExtension: uti)?.preferredFilenameExtension
    }

However, this doesn't work as expected and I am pretty sure that it is returning a nil value since the operation cancels itself. I'm unable to trigger a breakpoint to verify this since the method is called from outside the app (e.g., sharing a photo from the Photos app).

I've also tried:

    public func pathExtensionForUTI(_ uti: String) -> String? {
        return UTType(filenameExtension: self.pathExtension)?.preferredFilenameExtension
    }

But this requires turning the static method into an instance method and creating several URL objects. It also doesn't take into account the passed-in uti.

Thanks in advance for any insight you can provide!

Your code returns the preferred path extension for a string identifier like public.jpeg. This is pretty easy with UTType, you have to use the init method taking an identifier

import UniformTypeIdentifiers

func pathExtensionForUTI(_ identifier: String) -> String? {
    UTType(identifier)?.preferredFilenameExtension
}

pathExtensionForUTI("public.jpeg")

I would put the code into an extension of UTType rather than URL