uuniq/dist/Snowflake.class.mjs

Short but unique IDs.

// src/Snowflake.class.ts
import _ from "lodash";

// src/defaults/SnowflakeOptions.default.ts
var SnowflakeOptionsDefault = {
  epoch: "2025-01-01T00:00:00.000Z",
  place_id: 0
};

// src/Snowflake.class.ts
var parts = {
  timestamp: 53,
  place_id: 4,
  sequence: 10
};
var calculateLimits = (parts2) => {
  const limits2 = {};
  const keys = Object.keys(parts2);
  for (const key of keys) limits2[key] = Math.pow(2, parts2[key]) - 1;
  return limits2;
};
var calculateShifts = (parts2) => {
  const shifts2 = {};
  let shift = 0;
  const keys = ["sequence", "place_id", "timestamp"];
  for (const key of keys) {
    shifts2[key] = shift;
    shift += parts2[key];
  }
  return shifts2;
};
var limits = calculateLimits(parts);
var shifts = calculateShifts(parts);
var Snowflake = class {
  constructor(options = SnowflakeOptionsDefault) {
    this.options = _.merge({}, SnowflakeOptionsDefault, options);
    this.epoch = this.options.epoch instanceof Date ? this.options.epoch.getTime() : typeof this.options.epoch === "string" || typeof this.options.epoch === "number" ? new Date(this.options.epoch).getTime() : (/* @__PURE__ */ new Date("2025-01-01T00:00:00.000Z")).getTime();
    if ((this.options.place_id ?? 0) < 0 || (this.options.place_id ?? 0) > limits.place_id) throw new Error(`Field place_id must be between 0 and ${limits.place_id}`);
    this.options.place_id = (this.options.place_id ?? 0) & limits.place_id;
    this.sequence = 0;
    this.last_timestamp = -1;
  }
  currentTimestamp() {
    return Date.now() - this.epoch;
  }
  waitForNextTime(last_timestamp) {
    let timestamp = this.currentTimestamp();
    while (last_timestamp >= timestamp) timestamp = this.currentTimestamp();
    return timestamp;
  }
  generate() {
    let timestamp = this.currentTimestamp();
    if (timestamp < this.last_timestamp) throw new Error("Clock moved backwards.");
    if (timestamp === this.last_timestamp) {
      this.sequence = this.sequence + 1 & limits.sequence;
      if (this.sequence === 0) timestamp = this.waitForNextTime(this.last_timestamp);
    } else this.sequence = 0;
    this.last_timestamp = timestamp;
    return (BigInt(timestamp) << BigInt(shifts.timestamp) | BigInt(this.options.place_id ?? 0) << BigInt(shifts.place_id) | BigInt(this.sequence)).toString();
  }
  resolve(id) {
    const bigint_id = BigInt(id);
    return {
      created_at: new Date(this.epoch + Number(bigint_id >> BigInt(shifts.timestamp) & BigInt(limits.timestamp))).toISOString(),
      place_id: Number(bigint_id >> BigInt(shifts.place_id) & BigInt(limits.place_id)),
      sequence: Number(bigint_id & BigInt(limits.sequence))
    };
  }
};
export {
  Snowflake
};