JS Optional Chaining

Can anyone tell me, why the inspection of Reshaper is reporting following JavaScript code as a JScriptError? 

const person = { firstName: "John", lastName: "Doe" };

console.log(person?.firstName);

These are the error messages (on the line with the console.log):

-> ) expected

-> ; is expected

The file opened in Rider has no issues. Which configuration in the inspections will resolve this issue? 

Thanks a lot for any tips