spectral-cli lint with custom resolver not working

[pboos]

I am trying to run spectral lint using a custom resolver that allows to resolve http with basic auth. So I am following the instructions on https://github.com/stoplightio/spectral/blob/develop/docs/guides/2-cli.md#custom-ref-resolving.

But running spectral lint /data/spec/index.yaml --resolver resolver.js --ruleset spectral.yaml -v results in an error:

Cannot find module '@stoplight/json-ref-resolver'

How could one make this work? Or is this a known bug?

Note: I am trying to make this work using docker stoplight/spectral:6.6.0.
Whole command I run locally is:

docker run --rm -v $(pwd):/data \
  890546402176.dkr.ecr.eu-central-1.amazonaws.com/hubdockercom/stoplight/spectral:6.6.0 \
  lint /data/spec/index.yaml --resolver /data/spec/resolver.js --ruleset /data/spec/spectral.yaml -v

Thank you very much for your help 🙏 .