/**
 * Canonical — Shared Cryptographic Primitives
 *
 * Deterministic JSON serialization and SHA-256 hashing
 * used across governance modules. Single source of truth
 * eliminates duplication and guarantees behavioral consistency.
 *
 * Uses Web Crypto API (globalThis.crypto.subtle) for runtime
 * agnosticism — works on Node.js 20+, Cloudflare Workers, Deno, Bun.
 *
 * @module
 * @internal
 */
/**
 * SHA-256 hash of a string, returned as lowercase hex.
 *
 * Uses the Web Crypto API (crypto.subtle) for runtime agnosticism.
 *
 * @param input - The string to hash
 * @returns 64-character hex digest
 */
export declare function sha256(input: string): Promise<string>;
/**
 * Canonical JSON serialization with deterministic key ordering.
 *
 * Guarantees that two structurally identical objects produce
 * the same string regardless of property insertion order.
 * This is critical for content-addressed hashing — the same
 * contract must always produce the same digest.
 *
 * @param obj - The value to serialize
 * @returns Deterministic JSON string
 */
export declare function canonicalize(obj: unknown): string;
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