Then you haven’t seen anything yet. x) There are tons of tools, of course also including jslint, debuggers (e.g. IntelliJ, dunno about others). There are edito

Then you haven’t seen anything yet. x) There are tons of tools, of course also including jslint, debuggers (e.g. IntelliJ, dunno about others). There are editors and even IDEs. Then there’s the problem of bringing (NPM) modules to the browser using tools like webpack or SystemJS or whatever. There are general purpose build/automation systems like gulp. There are transpilers that “compile” ES6 to ES5. For any given task, you can probably find at least five programs that do it. And if you look at all the topics, you’ll find that library management makes up only a small fraction of everything.