Eslint updated their config, deprecated an option we were using for checking function name spacing.
Here is the right config, and there are 2 errors to fix:
theodore@monkey:~/DEV/DRUPAL/drupal$ eslint .core/misc/dialog/dialog.ajax.js
45:38 error Missing space before function parentheses space-before-function-paren
core/modules/tour/js/tour.js
26:42 error Missing space before function parentheses space-before-function-paren
✖ 2 problems (2 errors, 0 warnings)