target property Null safety
Return the expression producing the object on which the method is defined,
null if there is no target (that is, the target is implicitly
or if this method invocation is part of a cascade expression.
Use realTarget to get the target independent of whether this is part of a cascade expression.
Expression? get target;
Set the expression producing the object on which the method is defined to
@Deprecated('Clients should not build AST manually') set target(Expression? expression);