import "./register.css";
import { type ReactNode } from "react";
import { type SortHeaderLabels, type SortState } from "./sort_header";
import { type PartAttrs } from "./style_props";
/**
 * The band of labels stays; the caller's header part on the same element states its layout. Columnar, the
 * band is an ARIA table of one row of column headers, the one role `aria-sort` is allowed on; the rows under
 * it stay role-less, since a row is a press surface holding its own controls. A pile has no columns. `row`:
 * the register is itself the grid, so the band is its first row and brings no table.
 */
export declare function RegisterHead({ attrs, columnar, children }: {
    attrs: PartAttrs;
    columnar: boolean | "row";
    children: ReactNode;
}): import("react").JSX.Element;
/** A heading box's role, and the order it holds where the rows are sorted by its column — on that one
 *  column alone (WAI-ARIA 1.2 `aria-sort`). */
export declare function headingAria(sortKey: string, sort: SortState | null | undefined): {
    role: "columnheader";
    "aria-sort"?: "ascending" | "descending";
};
export interface RegisterHeadingProps {
    /** Sentence case. Omit for a control column. */
    label?: string;
    /** A ruler of positions rendered instead of `label`, which still names the column for sorting. */
    header?: ReactNode;
    sortKey: string;
    sortable?: boolean;
    sort?: SortState | null;
    onSort?: (key: string) => void;
    align?: "left" | "right";
    labels?: SortHeaderLabels;
}
/** Chrome, not a heading: body rung, a weight below its values, a step back in ink. */
export declare function RegisterHeading(props: RegisterHeadingProps): string | number | bigint | boolean | import("react").JSX.Element | Iterable<ReactNode> | Promise<string | number | bigint | boolean | Iterable<ReactNode> | import("react").ReactElement<unknown, string | import("react").JSXElementConstructor<any>> | import("react").ReactPortal | null | undefined> | null;