This might be a dumb question so sorry in advance. I have gotten this result when I run eslint on my file.
0:0 warning File ignored by default. Use "--ignore-pattern '!node_modules/*'" to override
✖ 1 problem (0 errors, 1 warning)
jafar70:~/workspace (master) $ eslint --ignore-pattern ./node_modules/.bin/eslint index.js
jafar70:~/workspace (master) $
Yes, when eslint returns no output, it means there were no issues found.
echo $? to see the last commands exit code. It should be
0 if successful. Anything else is an error. (or for Windows use errorlevel)
You could also test it by intentionally violating one of your rules and running it again.