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.
Additional methods to jest.fn to introduce "late resolve" of promises returned by mock functions. This allows tests that read chronologically, like a story.