The 2k line expression evaluator is kind of an actual language here. I think its error messages and devtools will matter much when people literally still write raw JS.
You're 100% right. Good error messages are important AF for something like this. I'm take a deeper look into this and focus into proper devtools support ASAP to make sure the quality is where it needs to be. Thanks for the comment ;)
Btw, its OSS, feel free to evaluate yourself and contribute!