import type { CCIPMessage, CCIPVersion } from '../types.ts';
/** Function type for computing the leaf hash of a CCIP message. */
export type LeafHasher<V extends CCIPVersion = CCIPVersion> = (message: CCIPMessage<V>) => string;
export declare const LEAF_DOMAIN_SEPARATOR = "0x00";
export declare const ZERO_HASH: string;
/**
 * Computes the Keccak-256 hash of the concatenation of two hash values.
 * @param a - The first hash as a Hash type.
 * @param b - The second hash as a Hash type.
 * @returns The Keccak-256 hash result as a Hash type.
 */
export declare function hashInternal(a: string, b: string): string;
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