是否需要从基础包中显式导入 roxygen?

Are explicit roxygen import from base package needed?

具体例子:

在我的包中,我的一个函数使用 grep 形式的 base 包。

我应该显式导入 grep 还是只会引入无用的依赖项?我的意思是,每个人都已经有了 base 包,对吧?

为了便于说明:

#' Group_by with regex based column selection
#' Similar to `group_by` but grouping columns are selected with a regex.
#' @importFrom dplyr group_by
#' @importFrom base grep
#' @export
group_at <- function(df, pattern)
  group_by_(df, .dots=grep(names(df), pattern=pattern, value=T))

来自编写 R 扩展 手册 sec.1.1.3:

It makes no sense to declare a dependence on R without a version specification, nor on the package base: this is an R package and package base is always available.

从 NAMESPACE

中删除与程序包 base 关联的以下术语
  import(base)  , 
 importFrom(base,system.file)

并在 DESCRIPTION 文件中,删除以下术语。

 Imports: base  

然后下面的错误就消失了:

 preparing package for lazy loading
Error in asNamespace(ns, base.OK = FALSE) : 
  operation not allowed on base namespace
ERROR: lazy loading failed for package 'aa'