code: function map(classMap) {
  		if (typeof classMap === 'function') {
  			options.classMap = classMap;
  		} else {
  			options.classMap = function (className) {
  				return classMap[className] || className;
  			};
  		}
  	}
docs: Maps all class names using the given object or map function.
  
  This does not affect the prefix.
  
  @param {Object<string, string> | ClassMapper} classMap