one declared package dependency, e.g. { name: 'testthat', type: Suggests, constraint: '>= 2.1.0' }
{ name: 'testthat', type: Suggests, constraint: '>= 2.1.0' }
Optional
Readonly
the version qualifier as written in DESCRIPTION, e.g. >= 3.0.0 (absent = any version)
>= 3.0.0
one declared package dependency, e.g.
{ name: 'testthat', type: Suggests, constraint: '>= 2.1.0' }