The chrome dev tools API has a neat function to inject new source code by only replacing all functions from the new code, thereby keeping any state. I've used t

The chrome dev tools API has a neat function to inject new source code by only replacing all functions from the new code, thereby keeping any state. I've used this when building wright (https://github.com/porsager/wright https://github.com/porsager/wright) to allow for hot reloading of anything (no need for redux). CSS reload is also instantaneous with wright, so might even make sense for you to use with the setup you described - No need for copy pasting ;) You can see it in action here https://porsager.com/wright/example.mov https://porsager.com/wright/example.mov - The start is editing js code (a mithril app) that is going through rollup, but there's also editing of raw css files at the end.