code: List<ApiImplementor> getApiImplementors() {
          if (apiImplementors == null) {
              return Collections.emptyList();
          }
          return Collections.unmodifiableList(apiImplementors);
      }
docs: Gets the {@link ApiImplementor}s added to this hook.
  
  @return an unmodifiable {@code List} containing the added {@code ApiImplementor}s, never {@code null}.
  @since 2.6.0