The type of function returned by RenderObject.getSemanticsAnnotators().
These callbacks are called with the SemanticsNode object that corresponds to the RenderObject. (One SemanticsNode can correspond to multiple RenderObject objects.)
See RenderObject.getSemanticsAnnotators() for details on the
contract that semantic annotators must follow.
Source
typedef void SemanticsAnnotator(SemanticsNode semantics);