@thi.ng/ksuid/ksuid64.js

Configurable K-sortable unique IDs, ULIDs, binary & base-N encoded, 32/48/64bit time resolutions

import { AKSUID } from "./aksuid.js";
class KSUID64 extends AKSUID {
  constructor(opts) {
    super(8, {
      epoch: 16e11,
      bytes: 12,
      ...opts
    });
  }
  timeOnlyBinary(epoch = Date.now(), buf) {
    buf = buf || new Uint8Array(this.size);
    const t = this.ensureTime(epoch - this.epoch);
    const h = t / 4294967296 >>> 0;
    const l = (t & 4294967295) >>> 0;
    buf[0] = h >>> 24;
    buf[1] = h >> 16 & 255;
    buf[2] = h >> 8 & 255;
    buf[3] = h & 255;
    buf[4] = l >>> 24;
    buf[5] = l >> 16 & 255;
    buf[6] = l >> 8 & 255;
    buf[7] = l & 255;
    return buf;
  }
  parse(id) {
    const buf = this.tmp;
    this.base.decodeBytes(id, buf);
    return {
      epoch: this.u32(buf) * 4294967296 + this.u32(buf, 4) + this.epoch,
      id: buf.slice(8)
    };
  }
}
const defKSUID64 = (opts) => new KSUID64(opts);
export {
  KSUID64,
  defKSUID64
};