Unable to work with sibling packages

[dietergeerts]

When reporting a bug, please include:

• A little info about your environment

  • npm-package-json-lint version: 5
  • npm version: 6.14.5
  • node version: 12.18

• The output from npm-package-json-lint

> npmPkgJsonLint ../

path should be a `path.relative()`d string, but got "../client-app-todo/package.json"
npm ERR! Test failed.  See above for more details.

Process finished with exit code 1

• What you expected to happen
  That a relative path going upwards works, as I have a mono-repo with rush, where all packages are siblings. I have packages that do linting and testing, and they do this for their siblings.

• The steps to reproduce the problem
  Use sibling packages, and set the glob to going up on level.

[dietergeerts]

As a workaround, I updated my script to:

    "test": "cd .. && npmPkgJsonLint ./*/package.json --configFile ./tools-linting-npm-package-json-lint/.npmpackagejsonlintrc.json"

But as you see, then you need to do "tricks", and your IDE will not help you anymore.
I could also place the config file in the root of the mono-repo, but that feels weird as the purpose of that one package is to run and configure the linting.