sp-module-loader
Built on familiar standards such as SystemJS and WebPack, the module loader is the first part of the SharePoint Framework to load on a page. It manages versioning and loading of client-side components, web parts, and other assets. It also provides basic diagnostic services.
This package is part of the SharePoint Framework, which is a collection of NPM packages that empower developers to create client-side experiences for Microsoft SharePoint. The SharePoint Framework is currently in Preview, and is subject to change based on customer feedback. For more information, including API documentation and code samples, please visit the SharePoint Framework Developer Preview web site.