Checks if directory exists using
vld_string(x) && dir.exists(x)
chk_dir(x, x_name = NULL)
vld_dir(x)The chk_ function throws an informative error if the test fails or
returns the original object if successful so it can used in pipes.
The vld_ function returns a flag indicating whether the test was met.
vld_dir(): Validate Directory Exists
For more details about the use of this function,
please read the article
vignette("chk-families").