in deployment/macos/diagnostic/SystemExtensionTester/SystemExtensionTester/ViewController.swift [314:320]
func request(_ request: OSSystemExtensionRequest,
actionForReplacingExtension existing: OSSystemExtensionProperties,
withExtension extension: OSSystemExtensionProperties) -> OSSystemExtensionRequest.ReplacementAction {
os_log("Replacing extension %@ version %@ with version %@", request.identifier, existing.bundleShortVersion, `extension`.bundleShortVersion)
return .replace
}