BiocCheck throws a warning when a package is listed as Imports: in DESCRIPTION
but not used in the NAMESPACE. This may happen when a developer uses the fully
qualified names of objects within a package. I am unclear as to the rationale
for this warning.
Per Hadley:
It's common for packages to be listed in Imports in DESCRIPTION, but not in
NAMESPACE. In fact, this is what I recommend: list the package in DESCRIPTION
so that it's installed, then always refer to it explicitly with pkg::fun().
Unless there is a strong reason not to, it's better to be explicit. It's a
little more work to write, but a lot easier to read when you come back to the
code in the future.
Per R extensions:
If a package only needs a few objects from another package it can use a fully
qualified variable reference in the code instead of a formal import. A fully
qualified reference to the function f in package foo is of the form foo::f.
-Andrew
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