/**
 * Partition one physical spread page into two logical half pages.
 *
 * Pure geometry: every element is assigned to the half holding the larger
 * share of its horizontal extent, right-half coordinates are re-based so each
 * logical page starts at x=0, and boxes are clamped to the logical page
 * bounds. Elements that genuinely span the gutter (a panoramic photo) end up
 * on the half with the larger overlap with their box clamped, a documented
 * v1 trade-off: the element content itself stays intact.
 */
import type { SpreadCandidateElement } from './types.js';
export interface PartitionedElements<T extends SpreadCandidateElement> {
    left: T[];
    right: T[];
}
/**
 * Assign every element to the half holding the larger share of its width.
 * Exact ties go left (reading order: left page comes first).
 */
export declare function partitionElements<T extends SpreadCandidateElement>(elements: T[], pageWidth: number): PartitionedElements<T>;
/**
 * Re-base an element's box onto its logical page: right-half elements shift
 * left by half the physical width, then every box is clamped to the logical
 * page bounds [0, halfWidth]. Returns a NEW element (input is not mutated).
 */
export declare function rebaseElementBox<T extends SpreadCandidateElement>(element: T, pageWidth: number, half: 'left' | 'right'): T;
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