If you run jsl with no args you see:
0 - Success
2 - Usage or configuration error
4 - File error
When you actually run jsl the warnings and errors are labeled things like:
Is there a configuration setting to get the number version or is there a place to see all the possible labels and their mappings to the levels?
Newer versions of jsl will print the version number if you run it without arguments:
Hope this helps.
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