isOriginalDeclaration property
Is this the original declaration of this type?
For most classes, they are their own original declaration. For generic classes, however, there is a distinction between the original class declaration, which has unbound type variables, and the instantiations of generic classes, which have bound type variables.
Implementation
bool get isOriginalDeclaration;
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https://api.dart.dev/stable/2.13.0/dart-mirrors/TypeMirror/isOriginalDeclaration.html