Unnecessary note when import only used in arg definition

Hi Antoine,

Maybe I'm misunderstanding, but I think the warning is saying that
you've declared the package dependency in the DESCRIPTION file, but
you haven't actually imported the package (or any functions) in your
package NAMESPACE file?

I put together an example package that I think satisfies the point
you're describing, and I don't see any R CMD check warnings (using R
4.2.2).

https://github.com/kevinushey/imports.example

As I understand it, if you declare a package dependency in the
DESCRIPTION file, you need to clarify how you're using the package in
the NAMESPACE file -- e.g. what symbols you want to import, and so on.

Best,
Kevin

On Mon, Feb 6, 2023 at 6:43 AM Antoine Fabri <antoine.fabri at gmail.com> wrote:

Dear r-devel,

When a package is only used in an argument definition, e.g :


f <- function(test = testthat::is_testing()) {

   if (test) 1 else 2

}


R CMD CHECK gives us a note: "Namespace in Imports field not imported from:
'testthat'"


This incites me to remove the package from the Imports field but that'll
make my package brittle.


I noted I'm not the first one having the issue (
https://github.com/r-lib/devtools/issues/2456 ) and I've seen some
workarounds too, in particular Hadley Wickham suggests in 'R packages' to
use the following construct :


ignore_unused_imports <- *function*() {

   aaapkg::aaa_fun

}


That's far from obvious though, and not very satisfying.

Are there any downside to removing this note in this scenario? it makes
little sense to me and incites wrong behaviour AFAIU.


Thanks,


Antoine

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