Add import

Author: Raushen

packages/devextreme/js/__internal/grids/grid_core/column_headers/m_column_headers.ts

@@ -9,6 +9,7 @@ import { getHeight } from '@js/core/utils/size';
 import { isDefined } from '@js/core/utils/type';
 import type { HeaderFilterController } from '@ts/grids/grid_core/header_filter/m_header_filter';
 import type { HeaderPanel } from '@ts/grids/grid_core/header_panel/m_header_panel';
+import type { Column } from '../columns_controller/m_columns_controller';
 
 import { CLASSES as REORDERING_CLASSES } from '../columns_resizing_reordering/const';
 import { registerKeyboardAction } from '../m_accessibility';