Is your feature request related to a problem? Please describe.
Support optional chaining syntax: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining

For example a?.b

Describe the solution you'd like

Obfuscate code making use of optional chaining.

Describe alternatives you've considered

Disable obfuscation for files containing this syntax

Additional context
Add any other context or screenshots about the feature request here.