Weyland is Durandal's cross-platform, NodeJS-based build tool, designed for optimized web deploy.
When you deploy a Durandal application, you often want to build the source files into a set of packages that are optimized for web deploy. Weyland is Durandal's cross-platform, NodeJS-based build tool, designed for that purpose. http://durandaljs.com/documentation/Building-with-Weyland/