I don't understand what you mean exactly – couldn't you use any language, even javascript, exactly the same version as you use right now, in 2100? Why not?
Have you tried? :-) Especially in the JavaScript world, things evolve so quickly, that they become obsolete within single years. If you use node and npm, within months.
To put this in contrast, Perl 5.001 was released on March 13, 1995 — that's more than 25 years ago, and code written in it will largely run fine today.
Edit: nice tool, by the way!