/**
 * bigIntToBytes converts a BigInt to a big-endian Uint8Array for encoding.
 * @param bi - The bigint to convert.
 * @param size - The size of the resulting byte array.
 * @returns A byte array containing the big-endian encoding of the input bigint
 */
export declare function bigIntToBytes(bi: bigint | number, size: number): Uint8Array;
/**
 * bytesToBigInt produces a bigint from a binary representation.
 *
 * @param bytes - The Uint8Array to convert.
 * @returns The bigint that was encoded in the input data.
 */
export declare function bytesToBigInt(bytes: Uint8Array): bigint;