/**
 * @pwngh/economy-lab
 *
 * Copyright (c) Preston Neal
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.md file in the root directory of this source tree.
 *
 * @license MIT
 */
/**
 * Lowercase hex, hand-written because neither `Buffer` nor `Uint8Array.prototype.toHex` exists on
 * every target runtime, and the result feeds cross-runtime hashes.
 *
 * @see {@link https://economy-lab-docs.pages.dev/economy/concepts/integrity/ Integrity} for the
 * hash chain these hex helpers feed.
 */
export declare function toHex(bytes: Uint8Array): string;
/**
 * Decodes a lowercase hex string back into its byte array.
 *
 * Throws on an odd length or any non-hex-digit character. Such input is a caller bug to fix at
 * the source, not a recoverable outcome.
 */
export declare function fromHex(hex: string): Uint8Array;
/**
 * Encodes a signed bigint as 8 bytes, big-endian two's complement.
 *
 * The sum-carrying checkpoint preimages (see chain.ts) hash balance sums, and a hash needs the
 * same bytes on every runtime: fixed width, fixed byte order, no decimal formatting. Throws when
 * the value falls outside the signed 64-bit range, the same bound the schema's BIGINT columns
 * declare — `DataView.setBigInt64` would silently wrap, and a wrapped sum must never reach a hash.
 */
export declare function toInt64BE(value: bigint): Uint8Array;
/**
 * Orders two strings by raw UTF-16 character codes, returning -1, 0, or 1 like a sort comparator.
 *
 * Character-code order through `<` and `>` is identical across runtimes and locales, unlike
 * `localeCompare`. That keeps any hash or report derived from sorted account ids or keys
 * matching everywhere.
 */
export declare function byCodeUnit(a: string, b: string): number;