selector property Null safety
The selector is a comma-separated list of patterns for any element such as a method, a field, an enum value.
Each pattern is a qualified name of the element which may end in "", indicating a wildcard. Wildcards are only allowed at the end and for a whole component of the qualified name, i.e. "foo." is ok, but not "foo.b*" or "foo..bar". A wildcard will match one or more components. To specify a default for all applicable elements, the whole pattern "" is used.