/** Walking the stemma of an edition along the principal derivations. */
import { Edition } from "../model/Edition.js";
import { Version } from "../model/Version.js";
/**
 * The version and its ancestors along the principal line, from the
 * version up to the root. A stemma that loops back on itself is walked
 * once round, so that an edition in that state can still be read and
 * repaired.
 * @category Versions and stemma
 */
export declare const lineageOf: (edition: Pick<Edition, 'versions'>, versionId: string) => Readonly<Version>[];
/**
 * The version the given one's text is read against, by its principal derivation.
 * @category Versions and stemma
 */
export declare const predecessorOf: (edition: Pick<Edition, 'versions'>, versionId: string) => Readonly<Version> | undefined;
/**
 * Every version with its generation: how many principal derivations
 * lie between it and the root. A version whose parent the edition does
 * not hold counts as a root. In a stemma that loops, the loop is walked
 * once round, as `lineageOf` walks it, so that the stemma of an edition
 * in that state can still be drawn and repaired.
 * @category Versions and stemma
 */
export declare const withGenerations: (edition: Pick<Edition, 'versions'>) => Array<Version & {
    generation: number;
}>;