As above, and presented in the screenshot.
Using Format document on valid JS code (no space between question marks) produces errors.
What I've tried so far was to change formatter, but to no avail. Error is especially irritating because I have formatting on save option on and I like it that way. Studio version is 1.46.
If you want to reproduce it yourself, feel free:
let iForgotToInitializeThat = undefined;
const coalesceResult = iForgotToInitializeThat ?? 'something';
