@thi.ng/ksuid/ksuid32.js

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

import { AKSUID } from "./aksuid.js";
const MAX_EPOCH = -1 >>> 0;
class KSUID32 extends AKSUID {
  constructor(opts) {
    super(4, {
      epoch: 16e11,
      bytes: 16,
      ...opts
    });
  }
  timeOnlyBinary(epoch = Date.now(), buf) {
    buf = buf || new Uint8Array(this.size);
    const t = this.ensureTime((epoch - this.epoch) / 1e3, MAX_EPOCH) >>> 0;
    buf[0] = t >>> 24;
    buf[1] = t >> 16 & 255;
    buf[2] = t >> 8 & 255;
    buf[3] = t & 255;
    return buf;
  }
  parse(id) {
    const buf = this.tmp;
    this.base.decodeBytes(id, buf);
    return {
      epoch: this.u32(buf) * 1e3 + this.epoch,
      id: buf.slice(4)
    };
  }
}
const defKSUID32 = (opts) => new KSUID32(opts);
export {
  KSUID32,
  defKSUID32
};