Optionalargumentscall only.
Optionaleffectswrite through a setter: what the setter does with the value.
call for a method call, write for an assignment.
Optionalresolvedcall: resolved callee; write: setter behind the target, if any.
call: setFormError, svc.save; write: assigned target.
Source text of the call or assignment, cut to 120 characters.
Optionalvaluewrite only: the value reads $event.
A call or assignment of a handler, resolved against the host class.