[jstejada]

This is really awesome-- At Nylas we've /also/ been building one for the past year to use in our email composer inside N1 (https://githbub.com/nylas/n1), with the additional constraint that it needs to support extension by third party plugins.

Building a nice declarative editing interface around an inherently mutable structure with an imperative API like the DOM (which can mutate state from under you, like focus) is a real challenge. Props to the team at facebook for this.