abortifnot              Ensure the truth of R expressions
array-type-checks       Array type checks
check                   Check the truth of tidy evaluated expressions
forbidden-value-checks
                        Forbidden value checks
inheritance-checks      Check class inheritance of an object
modifiers               Modify the behaviour of type checking functions
oop-checks              Check if an object is of a specific
                        object-oriented programming type
path-checks             File and directory existence checks
property-checks         Object property checks
s3-check-builders       S3 check builders
s3-type-checks          S3 type checks
scalar-type-checks      Scalar type checks
scalar-value-checks     Scalar value checks
type-checks             Type checks
walk-check              Apply a predicate check to each element of a
                        vector
