This option defines a variable that can be referenced by the file.Effectively the declaration is put at the top of your base Less file, meaning it can be used but it also can be overridden if this variable is defined in the file.
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This is not recommended for production, but for development it allows the compiler to produce a single output file which in browsers that support it, use the compiled css but show you the non-compiled less source.
Allows you to add a path to every generated import and url in your css.
Use this option if for instance you have a css file generated in the root on your web server but have your source less/css/map files in a different folder.
So for the option above you might have This is the opposite of the rootpath option, it specifies a path which should be removed from the output paths.