declare global {
    var __xxhash128: (input: string) => string;
    var __xxhash64: (input: string) => string;
}
/**
 * Hashes the input string using the xxhash128 algorithm.
 *
 * @param {string} input - The string to hash.
 * @returns {string} The 128-bit hash as a hex string.
 * @throws {Error} If the input is missing or not a string.
 */
export declare const hash128: (input: string) => string;
/**
 * Hashes the input string using the xxhash64 algorithm.
 *
 * @param {string} input - The string to hash.
 * @returns {string} The 64-bit hash as a hex string.
 * @throws {Error} If the input is missing or not a string.
 */
export declare const hash64: (input: string) => string;
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