import { randomBytes } from 'crypto';


// Copied from https://github.com/louischatriot/nedb/blob/master/lib/customUtils.js

/**
 * Return a random alphanumerical string of length len
 * There is a very small probability (less than 1/1,000,000) for the length to be less than len
 * (il the base64 conversion yields too many pluses and slashes) but
 * that's not an issue here
 * The probability of a collision is extremely small (need 3*10^12 documents to have one chance in a million of a collision)
 * See http://en.wikipedia.org/wiki/Birthday_problem
 */
export function uid(len: number): string {
  return randomBytes(Math.ceil(Math.max(8, len * 2)))
    .toString('base64')
    .replace(/[+\/]/g, '')
    .slice(0, len);
}