ftd gives a way for its platform,
fastn, to define some variables known as
foreign variables. These variables, then, can be used in the
ftd code whose value is provided by the platform. This gives
ftd to define its own variables.
fastn has one such foreign variables called
fastn package has
a special module, assets, importing which you
get access to its variables. These variables contains the reference to the files
or fonts defined in the package.
The file referring variables are foreign variables, while, fonts are simple variable.For more information, please visit assets.