可管理的运算符rxjs和Angular 6

Question

我有这样的效果：

@Effect()
  updateMappingAfterChangeFieldType$ = this.actions$.pipe(
    ofType(EditableObjectSchemaActionTypes.EditFieldType),
    withLatestFrom(
      this.store.select(fromReducers.getMappingFields),
      this.store.select(fromCore.getTimezones) // **
    ),
    map(([action, mappingFields, timezones]: [EditFieldType, MappingModel[], Timezone[]]) => 
    {
      const { uuid } = action.payload;
      const { fieldType } = action.payload;
      const fieldForUpdate = mappingFields.find(field => field.uuid === uuid);
      const defaultTimezone = timezones.find((timezone) => timezone.isDefault);// **
      const timezoneId = fieldType === DATE_TYPE ? defaultTimezone.id : '';// **
      return new UpdateExistingMapping({
        ...fieldForUpdate,
        timezoneId
      });
    })
  );

在许多地方使用标有//**的行。我想让它成为可管理的操作员。所以它看起来像这样：

@Effect()
  updateMappingAfterChangeFieldType$ = this.actions$.pipe(
    ofType(EditableObjectSchemaActionTypes.EditFieldType),
    withLatestFrom(
      this.store.select(fromReducers.getMappingFields)
    ),
    getDefaultTimezoneId,
    map(([action, mappingFields, defaultTimezoneId]: [EditFieldType, MappingModel[], string]) => 
    {
      const { uuid } = action.payload;
      const { fieldType } = action.payload;
      const fieldForUpdate = mappingFields.find(field => field.uuid === uuid);
      return new UpdateExistingMapping({
        ...fieldForUpdate,
        timezoneId: defaultTimezoneId
      });
    })
  );

我怎么能这样做？顺便说一句，效果是在课堂上。我如何导入pipe？因为当我尝试import {pipe} from 'rxjs/Rx'时，我收到有关黑名单的错误