snowflake.js

const leftpad = (v, n, c = '0') => String(v).length >= n ? '' + v : (String(c).repeat(n) + v).slice(-n);

class Snowflake {
  constructor ({ epoch, workerId, datacenterId } = { 1288834974657, 1, process.pid }) {
    this.epoch = epoch;
    this.workerId = workerId;
    this.dataCenterId = datacenterId;
    this.incId = 0;
  }

  nextId() {
    const timestamp = this.getTime().toString(2);
    const worker = leftpad(this.workerId.toString(2), 5);
    const datacenter = leftpad(this.dataCenterId.toString(2), 5);
    const inc = leftpad(this.incId.toString(2), 12);
    const snowflake = timestamp + worker + datacenter + inc;
    this.incId++;
    return parseInt(snowflake, 2);
  }
	
  getTime() {
    return new Date().getTime() - this.epoch;
  }
}

module.exports = Snowflake;