PFNGLIMPORTMEMORYWIN32NAMEEXTPROCDart typedef
        PFNGLIMPORTMEMORYWIN32NAMEEXTPROCDart =
     void Function(int memory, int size, int handleType, Pointer<NativeType>  name)
    
    
    
Implementation
typedef PFNGLIMPORTMEMORYWIN32NAMEEXTPROCDart =
    void Function(
      int memory,
      int size,
      int handleType,
      Pointer<NativeType> name,
    );