[Chartjs]-Using chart.js with importmaps in rail 7

I was able to solve this by fetching the library from the CDN rather than downloading it. To do this, I first unpinned the downloaded version:

bin/importmap unpin chart.js --download

and then I repinned it without downloading:

bin/importmap pin chart.js

And now it works!

As of August 2023, the setup for Chartkick (which uses chart.js) with Importmap is described in the Chartkick documentation, which worked for me.

Importmap
In config/importmap.rb, add:

pin "chartkick", to: "chartkick.js"
pin "Chart.bundle", to: "Chart.bundle.js"

And in app/javascript/application.js, add:

import "chartkick"
import "Chart.bundle"