>and dependencies? My gripe with node dependency management has been the lack of a .lock file, until yarn was released. Also, the ecosystem has kind of a mess

>and dependencies? My gripe with node dependency management has been the lack of a .lock file, until yarn was released. Also, the ecosystem has kind of a mess of transitive dependencies, which are sometimes in practice not resolvable to a working set of modules for a given dependency list. >Callback hell is gone with promises, and async/await is shipping in ES7. Sure, this particular problem is "solved" but due to the single threaded nature of js, even if you may async code look friendlier, its still the only tool you have for parallelizable tasks. And some of those tasks are a poor fit for async event loops. Tools like Elixir give your more concurrency tools, so that you don't have to shoehorn everything into async functions.