Wanted to resurrect this 2020 topic for a second because it was locked without a definitive explanation, so maybe I can offer one and help some future coding prodigy keep their anxiousness in check instead of wasting 30 minutes of their life looking into random commits for an answer to what these mean red lines might want from their binary schemes as their own twisted way of procrastinating.
So, it would seem that this is a visual bug specific to Monaco, an open-source text editor from Microsoft which powers Airtable’s Scripting app.
On my end, these squiggly eyesores only appear if I write btoa instead of BtoA immediately after a DOM refresh. But if I reload the page and use BtoA first, I can btoa as much as I want all over the place.
Sd linting quirks don’t affect functionality and the inconsistent accounts from the previous thread suggest the lines might actually originate from a third-party spellchecker (or a rare example of a second-party offender, if you’re running the Microsoft Editor browser extension; either way, there aren’t that many things that can mess with browser runtime), I give this bug roughly zero to no chance of ever getting fixed.