In most cases, blogdown can process images and HTML widgets
automatically generated from code chunks (they will be moved to the
static/ folder by default), but it may fail to recognize dependency
files generated to other paths. This function returns a path that you can use
for your output files, so that blogdown knows that they should be be
processed, too. It is designed to be used in a knitr code chunk.
Return this default value when this function is called outside of a knitr code chunk.
A character string of the
default value (outside knitr),
or a path consisting of the knitr figure path appended by the current
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