code: function _gpfDefineClassImport(InstanceBuilder) {
          var entityDefinition = _gpfDefineEntitiesFindByConstructor(InstanceBuilder);
          if (entityDefinition) {
              return entityDefinition;
          }
          return _gpfDefineClassImportFrom(InstanceBuilder, _gpfDefineClassImportGetDefinition(InstanceBuilder));
      }
docs: Import a class as an entity definition
  
  @param {Function} InstanceBuilder Instance builder (must be an ES6 class)
  @return {_GpfEntityDefinition} Entity definition
  @since 0.2.9