Using hot reload from Chrome extension (React)

I’m using React to build a Chrome extension (using this boilerplate)

Currently, I need to manually build it every time to see the changes in the extension.
What changes do I need to do in package.json to have ‘hot deployment’
(I need the files in the disk to be changed automatically)

Thanks

React Chrome Extension with Multiple scripts

I know with react, it puts everything together into one js file usually called main.

Is it possible to change the config of build on react to keep some files separate in order to maintain chromes “content_script”, “background”, and “popup” intact?