Are there any guidelines on using code written by others for other challenges as a part of an answer to a completely different challenge? It's a bit of a special case, but I'll explain.
I made some improvements to their code, as well an converting it to ES6 for the benefit of arrow functions. When included as a part of my answer it does indeed save a few bytes. Before I submit though, I wanted to know how this sort of reuse might be viewed. Being that it is unrelated to challenge I'm submitting to (which involves image generation), would it be considered acceptable to submit to this challenge, and give to credit to the author for the part their code played in getting the final size down?