Have I mentioned recently how much of a train wreck the entire JavaScript ecosystem is? And how people have been (had to?) piling more carcases and exploded body parts on top for decades now? Consider nothing more than the word "modules". Oy veh. No, flow, typescript, babel, ES20XX, etc. are not actual solutions to the problem. They only confuse the matter, are poorly documented, assume you have a JavaScript shaped brain, change all too fast, and are mostly a nightmare of incompatibility and inscrutability.