reflectee property
dynamic reflecteeIf the InstanceMirror reflects an instance it is meaningful to have a local reference to, we provide access to the actual instance here.
If you access reflectee when hasReflectee is false, an exception is thrown.
Source
get reflectee;
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https://api.dartlang.org/stable/1.24.3/dart-mirrors/InstanceMirror/reflectee.html