Max Fey,
We tried deploying a React app with CanvasJS Chart in vercel, it seems to be working fine. Please take a look at this link for a working sample that’s deployed in vercel and checkout this Github repository for the project.
If you are still facing issue, kindly share your project with us over Google-Drive or Onedrive (or in Github) so that we can try deploying it from our side to understand the scenario better and help you out.
—
Vishwas R
Team CanvasJS