LiveServer might work here, basically you can trigger a modification by saving the script you work on which would trigger a page reload, you might want to consider a similar discussion for live reload with Weave which led to this PR; it should be possible to adapt it to your use case with Interact.
Note that I’ve not tried this and am not very familiar with Interact so there may be hidden difficulties.
Btw, some people may be interested in this recent discussion to get Interact to work well with Franklin (which itself relies upon LiveServer) to get a locally served app with live reload, it should be interesting 
.