Well, indeed, Node is a good example of the point I'm making - it provided a full environment for writing programs in JS outside the browser.
There were a plethora of other languages/runtimes available for writing such programs, but Node made this available to people who already knew & liked using JS without having to switch to and/or learn a new language.
There were a plethora of other languages/runtimes available for writing such programs, but Node made this available to people who already knew & liked using JS without having to switch to and/or learn a new language.