When the 'lint' script in package.json is run with npm run lint, it gives 82 linting errors.

Running the rake lint:eslint task gives something like this:

rake lint:eslint
Running eslint via `cd client && $(npm bin)/eslint . -- --ext .jsx,.js`
cd client && $(npm bin)/eslint . -- --ext .jsx,.js

But that's it.

Assuming that the Rake task isn't working, are these real linting errors given your "eslint-config-shakacode" package? If so, I will fix them, let me know if it would make sense to try and fix them here.