/**
 * Generates an ID from a string using the SHA-1 algorithm. Given the same input, the ID will always be the same.
 *
 * @param str - Input string
 * @param length - Length of returned hash. The maximum length of the hash is 40 characters. The default length is 16.
 * @returns First `length` characters of the SHA-1 hash of `str`.
 */
export declare function generateId(str: string, length?: number): Promise<string>;
/**
 * Generates a random ID.
 *
 * @param length - Length of returned hash. The maximum length of the hash is 40 characters.
 * @returns First `length` characters of the SHA-1 hash of a random UUID.
 */
export declare function generateRandomId(length?: number): Promise<string>;
/**
 * Generates a checksum of a JSON object.
 *
 * @param obj - JSON object.
 * @param length - Length of returned hash. The maximum length of the hash is 40 characters.
 * @returns First `length` characters of the SHA-1 hash of sorted and serialized version of `obj`.
 */
export declare function generateChecksum(obj: unknown, length?: number): Promise<string>;