Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
Tiny library that simplifies subclassing and inheriting from Error while keeping the correct name and stack. Also supports constructing from an object of properties. Saves you from boilerplate.