Nothing
Code
validate_aliases(list(mono = letters), list())
Condition
Error in `FUN()`:
! `alias` must be a single string, not a character vector.
Code
validate_aliases(list(sans = "foobar"), list())
Condition
Warning:
System font "foobar" not found. Closest match is "Helvetica"
Output
$system
$system$sans
[1] "Helvetica"
$system$serif
[1] "Times"
$system$mono
[1] "Courier"
$system$symbol
[1] "Symbol"
$user
list()
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