When packaging extensions, it's now possible to strip away all source

media files (non-minified JavaScript/CSS/LessCSS files) from the

resulting package. These are generally not needed, and doing so can

reduce the size of the package.
There's a remove-source-files option that can be set in setup.cfg that

will cause all JavaScript/CSS/LessCSS source files to be removed from

the build. This can be set by adding the following to setup.cfg:

[build_static_files]
remove_source_files = 1

Made use of this in an extension. With the setting set, I saw that the

package and build directory contained only the bundle files (stamped and

unstamped), and not the source files or minified source files.