function Snowflake(_workerId, _dataCenterId, _sequence) {
  this.twepoch = 1288834974657n;
  this.workerIdBits = 5n;
  this.dataCenterIdBits = 5n;
  this.maxWrokerId = -1n ^ (-1n << this.workerIdBits);
  this.maxDataCenterId = -1n ^ (-1n << this.dataCenterIdBits);
  this.sequenceBits = 12n;
  this.workerIdShift = this.sequenceBits;
  this.dataCenterIdShift = this.sequenceBits + this.workerIdBits;
  this.timestampLeftShift = this.sequenceBits + this.workerIdBits + this.dataCenterIdBits;
  this.sequenceMask = -1n ^ (-1n << this.sequenceBits);
  this.lastTimestamp = -1n;
  this.workerId = 1n;
  this.dataCenterId = 1n;
  this.sequence = 0n;
  if (this.workerId > this.maxWrokerId || this.workerId < 0) {
    throw new Error('_workerId must max than 0 and small than maxWrokerId-[' + this.maxWrokerId + ']');
  }
  if (this.dataCenterId > this.maxDataCenterId || this.dataCenterId < 0) {
    throw new Error('_dataCenterId must max than 0 and small than maxDataCenterId-[' + this.maxDataCenterId + ']');
  }

  this.workerId = BigInt(_workerId);
  this.dataCenterId = BigInt(_dataCenterId);
  this.sequence = BigInt(_sequence);
}

Snowflake.prototype.tilNextMillis = function (lastTimestamp) {
  let timestamp = this.timeGen();
  while (timestamp <= lastTimestamp) {
    timestamp = this.timeGen();
  }
  return BigInt(timestamp);
};
Snowflake.prototype.timeGen = function () {
  return BigInt(Date.now());
};
Snowflake.prototype.nextId = function () {
  let timestamp = this.timeGen();
  if (timestamp < this.lastTimestamp) {
    throw new Error('Clock moved backwards. Refusing to generate id for ' +
        (this.lastTimestamp - timestamp));
  }
  if (this.lastTimestamp === timestamp) {
    this.sequence = (this.sequence + 1n) & this.sequenceMask;
    if (this.sequence === 0n) {
      timestamp = this.tilNextMillis(this.lastTimestamp);
    }
  } else {
    this.sequence = 0n;
  }
  this.lastTimestamp = timestamp;
  return ((timestamp - this.twepoch) << this.timestampLeftShift) |
      (this.dataCenterId << this.dataCenterIdShift) |
      (this.workerId << this.workerIdShift) |
      this.sequence;
};

let snowflake = new Snowflake(1n, 1n, 0n);

snowflake.nextId()