Whether a layer declares any selectors at all.
undefined, '' and [] all say "no selectors" -- the last two are what a producer emits when it found nothing to name -- so none of them is a declaration whose failure is worth reporting.
undefined
''
[]
The layer's selectors
selectors
True when the layer names at least one element
Whether a layer declares any selectors at all.
undefined,''and[]all say "no selectors" -- the last two are what a producer emits when it found nothing to name -- so none of them is a declaration whose failure is worth reporting.