We want to allow enhancing application functionality at run-time using dynamic plugins. It should be possible to author plugins in plain JavaScript i.e. with Angular or React, or using our GWT/Errai/UF programming model to transpile to JavaScript.

The latter can be achieved using JsInterop introduced in GWT 2.8, by making sure all relevant parts of the UberFire API are exported to JavaScript so that a script injected at run-time can provide object instances that are usable by scripts already loaded on the page (that have also been transpiled from Java). The management and exchange of these shared object instances should be provided by Errai's IOC bean manager.