modificationTime method
Returns the time that the Sass file at url
was last modified.
The url
comes from a call to canonicalize for this importer.
By default, this returns the current time, indicating that url
should be
reloaded on every compilation. If implementations override this to provide
a more accurate time, Sass will be better able to avoid recompiling it
unnecessarily.
If this throws an exception, the exception is ignored and the current time is used as the modification time.
Implementation
FutureOr<DateTime> modificationTime(Uri url) => DateTime.now();