import { RegularTableElement } from "regular-table";
import type { DatagridModel } from "../types.js";
import type { HTMLPerspectiveViewerElement } from "@perspective-dev/viewer";
import { CollectedHeaderRow } from "./types.js";
/**
 * Apply styles to column header rows.
 */
export declare function applyColumnHeaderStyles(model: DatagridModel, headerRows: CollectedHeaderRow[], regularTable: RegularTableElement, viewer: HTMLPerspectiveViewerElement): void;