husky pre-commit hook for handling ONLY staged files that will prevent commit if there are linting errors and auto-fix them

.huskyrc.js

/**
 * @see {@tutorial https://github.com/typicode/husky}
 * _Requires Node >= 10 and Git >= 2.13.0._
 */
module.exports = {
  hooks: {
    /**
     * @see {@tutorial https://stackoverflow.com/a/15656652/3942699}
     * 
     * ___only works with files staged in git___
     * because doing on the entire repo is overkill atm
     * 
     * if linting succeeds, proceed to committing the staged files.
     * if linting fails, prevent the commit from happening and fix the auto-fixable errors
     */
    'pre-commit': `
      stagedFiles=$(git diff --diff-filter=d --cached --name-only);
      if [ -n "$stagedFiles" ]; then # at least one file is staged
        {
          npx eslint $stagedFiles
        } || {
          npx eslint --fix $stagedFiles && exit 1
        }
      fi
    `,
  },
};