Base36 Random UID Generator

base36Id.ts

/**
 * Generate a random ID string
 *
 * Math.random should be unique because of its seeding algorithm.
 * Convert it to base 36 (numbers + letters) and grab the first 9 characters
 * after the decimal.
 *
 * @param config {RandomIdConfig}
 *
 * @return {string}
 */
function base36Id(opt?: RandomIdConfig): string {
  const { prefix, radix, maxLength } = opt ?? {}
  const id = Math.random()
    .toString(radix ?? 36)
    .substr(2/* e.g. first digit & decimal `0.` */, maxLength ?? 9)
  return String().concat(prefix ?? '', id)
}
type RandomIdConfig = {
  prefix?: string
  radix?: number
  maxLength?: number
}