Checks whether the provided object is a valid dockerignore class object.
See also
dockerignore() for creating a dockerignore object &
check_dockerignore() for ensuring an object is a dockerignore (with error)
Other dockerignore core functions:
c.dockerignore(),
check_dockerignore(),
dockerignore(),
print.dockerignore()
Examples
di <- dockerignore()
is_dockerignore(di) # TRUE
#> [1] TRUE
is_dockerignore(list()) # FALSE
#> [1] FALSE