JS files from /inst/js/ package directory to application headersystem.file should not be used to access files in other packages, it does
not work with devtools. Therefore, we redefine this method in each package
as needed. Thus, we do not export this method
include_js_files(pattern = NULL, except = NULL)HTML code that includes JS files.
(character) pattern of files to be included, passed to system.file
(character) vector of basename filenames to be excluded