Optional fromOptional mapSource map options
Optional nodeThe CSS node that was the source of the warning.
Optional parserFunction to generate AST by string.
Optional pluginName of plugin that created this warning. Result#warn will fill it
automatically with Plugin#postcssPlugin value.
Optional stringifierClass to generate string by AST.
Optional syntaxObject with parse and stringify.
Optional toThe path where you'll put the output CSS file. You should always set to
to generate correct source maps.
The path of the CSS source file. You should always set
from, because it is used in source map generation and syntax error messages.