/**
 * Calculates the SHA-512 checksum of the passed bytes. The implementation is
 * a plain (pure JS) one on purpose. It does not depend on the Web Crypto API
 * (`crypto.subtle`), which browsers expose only on secure origins (https).
 * Thanks to that, the checksum can be verified on plain http:// pages,
 * for example, intranets of big companies.
 *
 * @param {number[]|Uint8Array} bytes The bytes to calculate the checksum from.
 * @returns {string} The checksum as a 128-character hex string.
 */
export declare function sha512(bytes: number[] | Uint8Array): string;