/**
 * Generates a short id.
 *
 * Description:
 *   A 4-character alphanumeric sequence (364 = 1.6 million)
 *   This should only be used for JavaScript specific models.
 *   http://stackoverflow.com/questions/6248666/how-to-generate-short-uid-like-ax4j9z-in-js
 *
 *   Example: `ebgf`
 */
export declare function id(): string;