[Bioc-devel] Question about package dependency

Hi everyone,

I'm developing a Bioconductor package and I have a question about package
dependency. The functions in my package do not depend on ggplot2 but I used
ggplot2 to do some visualization in the package vignette. I'm wondering if
I should import ggplot2 in the DESCRIPTION file. If ggplot2 is not
imported, R CMD check will produce a note:


* checking tests ...

  Running ?testthat.R?

 OK

* checking for unstated dependencies in vignettes ... NOTE

'library' or 'require' call not declared from: ?ggplot2?

* checking package vignettes in ?inst/doc? ... OK

* checking running R code from vignettes ...

If ggplot2 is imported, since it is used only in the vignette, and none of
the function in my package depend on ggplot2, R CMD check generates another
note:

* checking loading without being on the library search path ... OK

* checking dependencies in R code ... NOTE

Namespace in Imports field not imported from: ?ggplot2?

  All declared Imports should be used.

* checking S3 generic/method consistency ... OK

* checking replacement functions ... OK



So I'm wondering if ggplot2 should be imported in this case. Thank you!

Sincerely,
Xu Ren

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