It’s gonna be tough to keep it together on this one. Okay. I got this. I am a professional technical writer . Straight face; all-business. Ahem: if you’ve been following the ongoing work at TC39 (the standards body responsible for maintaining and developing the standards that inform JavaScript) you may have encountered some of their recent work on ShadowRealms — snrk . Sorry! Sorry, I’m good! Just, whew ­— what a name, “ShadowRealms.” Okay, hang on, let me start at the beginning. Maybe that will help. It’s exceptionally likely you’ve seen JavaScript described as “single-threaded” at some point — that’s usually pretty high up on the list of JavaScript fundamentals, alongside “case sensitive,” “whitespace insensitive,” and “bad at math.” That is correct , in the strict “computer science” sense, but it still gets my hackles up a little whenever I see it. I mean, accurate in that JavaScript isn’t multi-threaded, for sure.…