Get the default sass cache object, for the current context. The context depends on factors described below.
sass_cache_get() first checks the sass.cache option. If it is set to
NULL or FALSE, then this function returns NULL. If it has been set to a string,
it is treated as a directory name, and this function returns a
sass_file_cache() object using that directory. If the option has been set
to a sass_file_cache() object, then it will return that object.
In most cases, this function uses the user's cache directory, by calling
rappdirs::user_cache_dir("R-sass").
If this function is called from a Shiny application, it will also look for a
subdirectory named app_cache/. If it exists, it will use a directory named
app_cache/sass/ to store the cache.
When running a Shiny application in a typical R session, it will not create
the app_cache/ subdirectory, but it will use it if present. This scopes the
cache to the application.
With Shiny applications hosted on Shiny Server and Connect, it will create
a app_cache/sass/ subdirectory, so that the cache is scoped to the
application and will not interfere with another application's cache.
sass_cache_get()If Shiny Developer Mode is enabled (by setting options(shiny.devmode = TRUE) or calling shiny::devmode(TRUE),
the default global option value for sass.cache is updated to FALSE instead
of TRUE, similar to getOption("sass.cache", FALSE). This setting allows
developers to make sure what is being returned from sass() is not an incorrect
cache result.