R Under development (unstable) (2024-07-28 r86931 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> message("*** current_script() ...")
*** current_script() ...
> 
> res <- startup::current_script()
> print(res)
[1] NA
> stopifnot(is.character(res), length(res) == 1L, is.na(res))
> 
> startup:::current_script_pathname("foo")
[1] "foo"
> res <- startup::current_script()
> print(res)
[1] "foo"
> stopifnot(is.character(res), length(res) == 1L, res == "foo")
> 
> startup:::current_script_pathname(NA_character_)
[1] NA
> res <- startup::current_script()
> print(res)
[1] NA
> stopifnot(is.character(res), length(res) == 1L, is.na(res))
> 
> message("*** current_script() ... DONE")
*** current_script() ... DONE
> 
> proc.time()
   user  system elapsed 
   0.09    0.07    0.15