/**
 * Deterministic JSON canonicalization per RFC 8785 (JSON Canonicalization Scheme),
 * with the clarifications mandated by Rubric Verify Spec v1.0.0-rc1 §6.1.
 *
 * Ported from @rubric/verify v1.0.0-rc.1 src/canonical.ts (Phase 1 of the
 * Federation v1 Refactor). Dependency-free.
 *
 * RFC 8785 / Rubric Verify Spec §6.1 rules:
 *   1. Object keys MUST be sorted lexicographically (UTF-16 code unit order).
 *   2. There MUST be no whitespace between tokens.
 *   3. Numbers MUST be serialized using the shortest representation that
 *      round-trips through IEEE 754 double-precision parsing.
 *   4. Strings MUST be UTF-8 encoded.
 *   5. Boolean values MUST be `true` or `false` (lowercase).
 *   6. The null value MUST be `null` (lowercase).
 *   7. Arrays MUST preserve their input order.
 *   8. The output MUST be UTF-8 encoded; the canonical message bytes are the
 *      UTF-8 encoding of the canonicalized string.
 */
export declare class CanonicalInputError extends Error {
    constructor(message: string);
}
/**
 * Canonicalize a JSON-compatible value to its RFC 8785 form (UTF-8 string).
 */
export declare function canonicalize(value: unknown): string;
/**
 * UTF-8-encode the canonicalization of `value`.
 *
 * Equivalent to `new TextEncoder().encode(canonicalize(value))`.
 */
export declare function canonicalizeBytes(value: unknown): Uint8Array;
/**
 * SHA-256 hex digest of the canonicalization of `value`.
 *
 * Bare lowercase hex, no algorithm prefix, no `0x` prefix. Matches the
 * `payload_hash` format mandated by Rubric Verify Spec §6.3.
 */
export declare function canonicalSha256Hex(value: unknown): string;
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