/**
 * @nexart/codemode-sdk — Canonical JSON (versioned, consensus surface)
 *
 * Two canonicalisation modes exist and BOTH are permanently supported by
 * verifiers. Mode is bound to `protocolVersion` (which is carried inside every
 * signed receipt), so the choice is authenticated. Unknown/unsupported
 * protocolVersion FAILS CLOSED (throws) — it is never silently defaulted.
 *
 *   • nexart-v1 (protocolVersion 1.2.0) — original NexArt canonicalisation. FROZEN.
 *   • jcs-v1    (protocolVersion 1.3.0) — RFC 8785 (JSON Canonicalization Scheme).
 *
 * The two are byte-for-byte identical for every JSON-safe value (proven by the
 * conformance harness against the `canonicalize` reference oracle). This module
 * is kept in lockstep with @nexart/ai-execution's canonicalJson.ts — the node
 * signer and both SDK verifiers MUST agree byte-for-byte.
 *
 * nexart-v1 rules:
 *  - Object keys are sorted lexicographically (UTF-16 code unit order)
 *  - No trailing commas, no whitespace
 *  - Arrays preserve insertion order
 *  - null, boolean, number, string are encoded as standard JSON literals
 *  - Undefined values and function-valued properties are omitted
 */
/** Canonicalisation modes. One per supported protocolVersion. */
export type CanonicalMode = 'nexart-v1' | 'jcs-v1';
/** Every protocolVersion literal this build understands. */
export type SupportedProtocolVersion = '1.2.0' | '1.3.0';
/** Single source of truth: which protocolVersion uses which canonicalisation. */
export declare const PROTOCOL_CANONICAL_MODE: Readonly<Record<string, CanonicalMode>>;
/** Every protocolVersion this build understands. Verifiers fail closed on anything else. */
export declare const SUPPORTED_PROTOCOL_VERSIONS: readonly string[];
export declare function isSupportedProtocolVersion(protocolVersion: unknown): protocolVersion is SupportedProtocolVersion;
/** Resolve the mode for a protocolVersion. FAIL-CLOSED: unknown version throws. */
export declare function canonicalModeForProtocol(protocolVersion: unknown): CanonicalMode;
/** Canonicalise using the mode bound to `protocolVersion`. Fail-closed on unknown version. */
export declare function canonicalJsonForProtocol(value: unknown, protocolVersion: unknown): string;
export declare function toCanonicalJson(value: unknown): string;
export declare function canonicalizeJcs(value: unknown): string;
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