[SheetWorker][API] Null coalescing in sheetworker breaks all APIs. Unexpected token '.'

Hello Roll20.

I just discovered that any usages of null coalescing in a sheet worker will make the API Console throw an error.

Here is a minimum working example:

Steps to reproduce

• Create a new game, with a Custom Character Sheet Template
• Add the following HTML to the HTML Layout tab:

<script type="text/worker">
    function helloWorld(name) {
        let test = name?.toLowerCase();
    }
</script>

• Click Save Changes
• Goto the API Console
• Add any API Script. (I tested with the Ammo script)
  
• Click Restart API Sandbox and open the game to see the following error:

Spinning up new sandbox...
"Loading character sheet data..."
"Starting webworker script..."
"Loading 0 translation strings to worker..."
"-=> Ammo v0.3.11 <=-  [Fri Jun 12 2020 13:48:05 GMT+0000 (Coordinated Universal Time)]"
"SyntaxError: Unexpected token '.'"
"SyntaxError: Unexpected token '.'
    at eval (<anonymous>)
    at messageHandler (evalmachine.<anonymous>:713:6)
    at process.<anonymous> (/home/node/d20-api-server/node_modules/tiny-worker/lib/worker.js:65:55)
    at process.emit (events.js:310:20)
    at emit (internal/child_process.js:876:12)
    at processTicksAndRejections (internal/process/task_queues.js:85:21)"

It seems like the code that parses sheetworker code, expects the question mark to be the ternary operator( isTrue ? true : false )
instead of null coalescing (someAttribute?.someValue).

If you write sheetworkers. Watch out for this one!