CoffeeScript largely got killed by EcmaScript 6. Two reasons why 1) Some CoffeeScript features, like arrow functions and classes, made it into ES6. 2) CoffeeS

CoffeeScript largely got killed by EcmaScript 6. Two reasons why 1) Some CoffeeScript features, like arrow functions and classes, made it into ES6. 2) CoffeeScript was never updated to properly generate ES6. Largely because the features that got adopted by ES6 had subtle differences that made the migration path for existing projects highly complex. I think, to a lesser extend, the rise of TypeScript also had something to do with it.