/epub!). It's always been published to npm and documented, but it's also always had some limitations that we suspect have limited its utility outside of Storyteller itself.
With this v1 release, we think we've eliminated many of those limitations. Now we have in memory and temp filesystem storage adapters, browser support (in-memory only), a DOM level 2 XML API (and JSX!), and a method for upgrading EPUB 2 to EPUB 3.