May be you should take a look at this discussion. Also, read Michel Weststrate 's answer to the same question.
I don't think there is a straight answer to that, however there are couple of things you could do to as a quick start:
Good luck!
Submitting Repo to Code triage might get you some influential collaborators. That would bring more traction to project. codetriage.com
Juho Vepsäläinen
SurviveJS
This is how it worked for webpack.