import { Page } from '../../contracts/src/index.js';
/** Inputs already fenced by exact note-source, render-input and same-index tail proofs. */
export interface RetainedFootnoteBandInput {
    previous: Page;
    current: Page;
    pageIndex: number;
    pageSize: {
        w: number;
        h: number;
    };
    columnCount: number;
    appliedReserve: number;
    anchorIds: readonly string[];
    previousBodyIndex: ReadonlyMap<string, number>;
    currentBodyIndex: ReadonlyMap<string, number>;
    retainedExtraIds: ReadonlySet<string>;
}
/**
 * Reattach a complete, bottom-anchored note band to a freshly paginated body
 * page. No note is re-sliced: changed assignments, continuations, geometry or
 * insufficient body clearance must go through canonical footnote planning.
 */
export declare function retainUnchangedFootnoteBand(input: RetainedFootnoteBandInput): Page | null;