It may be popular on GitHub because people pass out stars like they pass out likes on Facebook. In other words, it’s not very reliable if you want to know who’s using what. It indicates that it interests them, but not that they’re using it in production.

A much better indication of production use is to search for it in job listings. You can do that on indeed.com, for example. 59 total jobs list Vue.js in the description, compared to almost 5,000 for React, 8,000 for Angular, and 14,000 for jQuery.

Of course, most job descriptions don’t list all the libraries and frameworks in the tech stack (a search for JavaScript by itself reveals over 40,000 listings), but it does give you a fair indication of relative popularity in production projects.