Yes, eslint doesn’t like having nothing to do. This makes it feel more useful.
mkdir -p assets/javascripts/discourse
touch assets/javascripts/discourse/eslint.js.es6
git add assets/javascripts/discourse/eslint.js.es6
git commit -m 'try to make eslint not feel left out'
git push
Oh, but I think this is the real solution:
https://github.com/discourse/discourse/compare/master...pfaffman:patch-5