Support XO as Transitive Dependency

[osdevisnot]

Hi @SamVerschueren, first of - thank you so much for your efforts on this extension.

While using this extension, I noticed we look for xo being listed as dependency in the package.json at project root to enable the linting experience.

See relevant code here and here

It might be beneficial for us to look for xo being actually installed as opposed to just being listed in package.json - for example by trying to require it or by looking at package.json under <project-root>/node_modules/xo.

This will help address issues when xo is installed in a project as a transitive dependency of some other packages.

I can also look into creating an MR for this if you think it's a good idea.

[spence-s]

closed by 8ca7319