DEPRECATED
The pub transformer system will be removed in Dart 2. See the Dart 2 Migration Guide for guidance.
Barback is an asset build system. It is the library underlying
pub's asset transformers in
pub build and pub serve.
Given a set of input files and a set of transformations (think compilers, preprocessors and the like), it will automatically apply the appropriate transforms and generate output files. When inputs are modified, it automatically runs the transforms that are affected.
To learn more, see here.