If the UI5 application is still undergoing changes it's most likely not convenient to have to deploy to the ABAP server every time you change something on the UI5 side.
In that case you could install a local Tomcat server which can easily be integrated into eclipse.
The other (preferred) solution is to run a lightweight local webserver using node.js
Please refer to From ABAP to SAP/OpenUI5 - Setup webserver with proxy
Everything is explained there in detail.