openAgent

1const length = 26
2const chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
3let lastTimestamp = 0
4let counter = 0
5 
6export function ascending() {
7  return create(false)
8}
9 
10export function descending() {
11  return create(true)
12}
13 
14export function create(descending: boolean, timestamp = Date.now()) {
15  if (timestamp !== lastTimestamp) {
16    lastTimestamp = timestamp
17    counter = 0
18  }
19  counter++
20 
21  const current = BigInt(timestamp) * 0x1000n + BigInt(counter)
22  const value = descending ? ~current : current
23  const time = Array.from({ length: 6 }, (_, index) =>
24    Number((value >> BigInt(40 - 8 * index)) & 0xffn)
25      .toString(16)
26      .padStart(2, "0"),
27  ).join("")
28  const bytes = crypto.getRandomValues(new Uint8Array(length - 12))
29  return time + Array.from(bytes, (byte) => chars[byte % 62]).join("")
30}
31