An interface functions and mixins that can be invoked from Sass by passing
This class represents callables that need to do asynchronous work. It's
only compatible with the asynchonous
compile() methods. If a callback can
work synchronously, it should be a Callable instead.
See Callable for more details.
The callable's name.
The hash code for this object. [...]
A representation of the runtime type of the object.
Invoked when a non-existent method or property is accessed. [...]
Returns a string representation of this object.