dir function
Creates a new DirectoryDescriptor descriptor with name
and contents
.
Descriptor.validate requires that all descriptors in contents
match
children of the physical diretory, but it doesn't require that no other
children exist. To ensure that a particular child doesn't exist, use
nothing.
Implementation
DirectoryDescriptor dir(String name, [Iterable<Descriptor>? contents]) =>
DirectoryDescriptor(name, contents ?? <Descriptor>[]);