/**
 * Counts how many columns a layout component's children are arranged in, by counting the children that share the
 * first child's row. Works for any layout model (grid or flex), since it reads where the browser actually placed each
 * child rather than the container's track definitions.
 *
 * @param items - The layout's children, in source order.
 * @returns The number of children in the first row, or 0 if there are none.
 */
export declare const getColumnCount: (items: Iterable<Element>) => number;
/**
 * Returns the rendered widths of a layout component's children, rounded to the nearest pixel.
 *
 * @param items - The layout's children, in source order.
 */
export declare const getItemWidths: (items: Iterable<Element>) => number[];