Errors & warnings
In addition to rule problems, Stylelint surfaces the following errors and warnings:
CSS syntax error
The chosen PostCSS syntax was unable to parse the source.
The chosen PostCSS syntax successfully parsed, but one of the construct-specific parsers failed to parse either a media query, selector or value within that source.
The construct-specific parsers are:
Unknown rule error
There is an unknown rule in the configuration object.
There is a deprecated rule in the configuration object.
Invalid option warning
There is a misconfigured rule in the configuration object.