/**
 * Where a prerequisite resolves on disk: its declared path, the numbered
 * filename prefix `request init` writes, and the historical session-root tiers.
 *
 * THE ONE RESOLVER. The transition (`checkPrerequisites`) and the commit gate
 * (`checkExpiredBackCompatCommitGate`) both ask this module, so a numbered
 * prefix or a legacy root that one honours cannot be misread by the other.
 * It lives here, rather than in `artifact-prerequisites.ts`, because that file
 * is over the file-size cap and a change may only shrink it.
 */
import type { ArtifactPrerequisite } from './artifact-prerequisites.js';
export declare function resolvePrerequisitePath(prerequisite: ArtifactPrerequisite, requestId: string): string;
/** The two session-root tiers the resolver probes: the canonical session home
 *  and the pre-F3 legacy one. ONE constructor, so the transition and the commit
 *  gate cannot disagree about where a session's evidence lives. */
export type SessionRoots = {
    canonical: string | null;
    legacy: string | null;
};
export declare function sessionRootsFor(projectRoot: string, sessionId: string | undefined): SessionRoots;
/**
 * Resolve a prerequisite to an on-disk path, with a 2-tier fallback
 * dirs are no longer created):
 *   1. `<canonicalSessionRoot>/<relative>` (post-F3 canonical session
 *      home, when `canonicalSessionRoot` is provided).
 *   2. `<legacySessionRoot>/<relative>` (pre-F3 legacy session home,
 *      when `legacySessionRoot` is provided).
 * Tolerates the numbered filename prefix that `request init` writes
 * (e.g. `001-<rid>.md`) at every tier. Returns the matched absolute
 * path, or null when nothing matches.
 *
 * Back-compat: once neither primary session-root tier resolved, the
 * resolver walks `prerequisite.legacyRelativePaths` in declared order
 * and tries each at BOTH session roots before declaring the prereq
 * missing. This covers both artifacts that moved location
 * (`rd/security-review.md` → `audit/security.md`) and ones that later
 * gained a rid in the filename (`audit/security.md` →
 */
export declare function resolvePrerequisiteAbsolutePathWithFallback(canonicalSessionRoot: string | null, legacySessionRoot: string | null, prerequisite: ArtifactPrerequisite, requestId: string): Promise<string | null>;