Reflects a class declaration.
Let C be the original class declaration of the class represented by key.
This function returns a ClassMirror reflecting C.
If key is not an instance of Type, then this function throws an
ArgumentError. If key is the Type for dynamic or a function typedef,
throws an ArgumentError.
Note that since one cannot obtain a Type object from another isolate, this function can only be used to obtain class mirrors on classes of the current isolate.
Source
external ClassMirror reflectClass(Type key);