import type { ActionIntent } from '../types/policy.js';
/**
 * Compute the content-addressed request identity for an ActionIntent.
 *
 * Inputs hashed: agentId, action.type, action.scopeRequired, normalized timestamp.
 * Timestamp defaults to intent.createdAt; falls back to current time.
 *
 * Canonicalization follows RFC 8785 JCS strictly, per draft-pidlisnyi-aps-01
 * §4.1: null/undefined-valued keys are preserved (not stripped) so that two
 * APS engines independently hashing the same request produce the same
 * action_ref. This is the APS-native form. Cross-ecosystem byte-parity with
 * independent implementations (x402, AgentGraph CTEF, Nobulex) is provided by
 * a separate primitive, computeExternalActionRefV1 in external-action-ref.js,
 * which uses an intentionally different preimage; see that file and
 * docs/specs/action-ref-v1.md.
 *
 * Returns: lowercase hex SHA-256 digest.
 */
export declare function computeActionRef(intent: Pick<ActionIntent, 'agentId' | 'action' | 'createdAt'>): string;
/**
 * Two receipts with the same action_ref describe the same request.
 * Simple equality check — provided as a named predicate so the semantic
 * intent is explicit at the call site.
 */
export declare function actionRefsMatch(a: string, b: string): boolean;
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