Secure random ID

This notebook ports a notebook by Tom Larkworthy [@tomlarkworthy] called [Secure random ID](https://observablehq.com/@tomlarkworthy/randomid). All mistakes and deviations from the original are my own.

+--------------------------------------------------------------+ | — The following text/narrative is from the original — | +--------------------------------------------------------------+

~~~js
import {randomId} from '@tomlarkworthy/randomid'
~~~

const example = randomId()

const randomId = (len = 8) => {
  // From 'https://observablehq.com/@tomlarkworthy/randomid'
  // Avoid / and + and - and _ typof chars seen in base64
  const chars =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  var array = new Uint32Array(len);
  window.crypto.getRandomValues(array);
  return [...array].map((v) => chars[v % chars.length]).join("");
}