/**
 * Warning lines for superseded references (#108).
 *
 * These always go to stderr. stdout stays byte-identical to the unmarked case so that piping
 * `ref export`, `ref cite`, or `ref list --output ids` into another tool keeps working.
 *
 * See spec/features/superseded.md.
 */
import type { CslItem } from "../../core/csl-json/types.js";
/**
 * Build the stderr warning line for one reference.
 *
 * @returns The line, or null when the reference is not superseded
 */
export declare function formatSupersededWarning(item: CslItem, index: Map<string, CslItem>): string | null;
/**
 * Build warning lines for every superseded reference among `items`.
 *
 * @param items - The references being shown to the user
 * @param allItems - The whole library; pointers may target records outside `items`
 */
export declare function collectSupersededWarnings(items: CslItem[], allItems: CslItem[]): string[];
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