Earlier quoted context omitted.
This comment points out the kind of problems that can occur just on Unix systems - https://news.ycombinator.com/item?id=16485637 And then there’s Windows... Anyway, the fact that things change quickly in JS-land is more of a testament to how popular it is than anything else IMO. If C were used in the same environments as JS, I’m sure that you'd see just as much churn.
C is used in a lot of platforms. Js only in the browser (thankfully mostly converged) and in node.
Basically, it’s used everywhere that C is used and then some.