I noticed invalid code in the lintstaged configuration file, which wasn't picked up by ESLint. ESLint doesn't do this by default, see eslint/eslint#10341. I suggest creating a .eslintignore file like I use in vidavidorra/repo-template. The final !.* enables it to run on dotfiles. Currently we (ab)use the .gitignore file for ESLint too, but we can't just add !.* to the gitignore as that will stop ignoring some dotfiles we don't want.