Coffeescript was here to stay? I always saw it as a seki-esoteric language people sprinkled their CV with.
Dart was a push by Google but went nowhere.
TS drives Angular, has first-class support on React and soon in Vue. Most libs have TS typings. Nextjs (amongst others) provide easy TS integration. It’s being pushed by M$, C# and Java like seem to like it and Enterprise (tm) adopts it.
Or that other time, when Dart was almost here to stay, and on its way to replace JavaScript?