/**
 * Generate a unique ID. This is not guaranteed to be optimally fast, nor
 * is it strongly gauranteed not to collide with itself. But, you can set the
 * length of the ID, it uses characters from a reasonably large alphabet and
 * it is reasonably fast. In other words, it is good enough most of the time.
 */
export declare const uid: (length?: number) => string;