Honestly I think the main thing that the JS ecosystem does well is dependency / package management (npm). The standard library is very small so everything has to be added as a dependency in package.json, but it mostly works without any of the issues you often see in other languages.

Yeah, it's not perfect, but it's better than anything else I've tried:

• Python's approach is pretty terrible (pip, easy_install, etc.) and global vs local packages
• Ruby has its own hell with bundler and where stuff goes
• PHP has had a few phases like python (composer and whatnot) and left everyone confused
• Java needs things somewhere in its $PATH but it's never clear where (altough it's better with Gradle and Maven)
• C needs root access because the only form of dependency management is apt-get

In contrast, NPM is pretty simple: it creates a node_modules and puts everything there. No conflicts because project A uses left-pad 1.5 and project B uses left-pad 2.1. They can both have their own versions, thank you very much.

The only people who managed to mess this up are Linux distributions, who insist on putting things in folders owned by root.

C dependency management is the worst. I thoroughly dislike how it works over there.