Script sync fails with a SyntaxError on logical nullish assignment

[monk-time]

Same issue as #728 but with logical nullish assignment (ES2021 feature that is already supported by all major browsers) causing script sync to fail with a SyntaxError:

Script sync failed - Code contains errors: Uncaught SyntaxError: Unexpected token '??=' at undefined:1567:36.

https://github.com/JasonBarnabe/greasyfork/blob/17dac187d24a42dc6701216320d9bf868f65ea6b/Gemfile.lock#L233-L234
V8 started supporting this feature at v8.5. mini_racer has an update available (0.4.0.beta1, came out yesterday) where they have switched from libv8 to libv8-node (commit, explanation) which should be enough to fix this issue, node supports this feature since v15+. Meanwhile libv8 hasn't been updated from what you're using.

[JasonBarnabe]

mini_racer 0.4 is released (but not published?). I'll try it out and use if it works. Thanks for investigating.

[JasonBarnabe]

Updated to mini_racer 0.4, so you should be good to go now.