Angular 7 - How to separate files in different directories

It is not supported officially but you can use ,

--baseHref=baseHref      Base url for the application being built.

--deployUrl=deployUrl    URL where files will be deployed.

--outputPath=outputPath  path for the new output directory

By combining them you can move the js/map/index.html files to specific location and update the baseHref and url in index.html.

More on,

https://github.com/angular/angular-cli/issues/10171