Ask HN: Can i be a javasvcipt developer and find NLP work?

I am not a native english speaker , apologies if I am not clear enough. I am a self taught javascript and C developer . I would like to move to NLP . There are some popular nodejs libraries for NLP like natural, but all the jobs advertised seem to ask for Python or R. So , from a purely commercial point of view, does it make sense for me to invest time in nodejs libraries like natural ? Or would I be better off picking up a new language , (python or R)? Which language would you suggest and why ? Thanks.