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src/util/SnowflakeUtil.js

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+'use strict';
+
+// Discord epoch (2015-01-01T00:00:00.000Z)
+const EPOCH = 1_420_070_400_000;
+let INCREMENT = BigInt(0);
+
+/**
+ * A container for useful snowflake-related methods.
+ */
+class SnowflakeUtil extends null {
+  /**
+   * A {@link https://developer.twitter.com/en/docs/twitter-ids Twitter snowflake},
+   * except the epoch is 2015-01-01T00:00:00.000Z.
+   *
+   * If we have a snowflake '266241948824764416' we can represent it as binary:
+   * ```
+   * 64                                          22     17     12          0
+   *  000000111011000111100001101001000101000000  00001  00000  000000000000
+   *       number of ms since Discord epoch       worker  pid    increment
+   * ```
+   * @typedef {string} Snowflake
+   */
+
+  /**
+   * Generates a Discord snowflake.
+   * <info>This hardcodes the worker's id as 1 and the process's id as 0.</info>
+   * @param {number|Date} [timestamp=Date.now()] Timestamp or date of the snowflake to generate
+   * @returns {Snowflake} The generated snowflake
+   */
+  static generate(timestamp = Date.now()) {
+    if (timestamp instanceof Date) timestamp = timestamp.getTime();
+    if (typeof timestamp !== 'number' || isNaN(timestamp)) {
+      throw new TypeError(
+        `"timestamp" argument must be a number (received ${isNaN(timestamp) ? 'NaN' : typeof timestamp})`,
+      );
+    }
+    if (INCREMENT >= 4095n) INCREMENT = BigInt(0);
+
+    // Assign WorkerId as 1 and ProcessId as 0:
+    return ((BigInt(timestamp - EPOCH) << 22n) | (1n << 17n) | INCREMENT++).toString();
+  }
+
+  /**
+   * A deconstructed snowflake.
+   * @typedef {Object} DeconstructedSnowflake
+   * @property {number} timestamp Timestamp the snowflake was created
+   * @property {Date} date Date the snowflake was created
+   * @property {number} workerId The worker's id in the snowflake
+   * @property {number} processId The process's id in the snowflake
+   * @property {number} increment Increment in the snowflake
+   * @property {string} binary Binary representation of the snowflake
+   */
+
+  /**
+   * Deconstructs a Discord snowflake.
+   * @param {Snowflake} snowflake Snowflake to deconstruct
+   * @returns {DeconstructedSnowflake}
+   */
+  static deconstruct(snowflake) {
+    const bigIntSnowflake = BigInt(snowflake);
+    return {
+      timestamp: Number(bigIntSnowflake >> 22n) + EPOCH,
+      get date() {
+        return new Date(this.timestamp);
+      },
+      workerId: Number((bigIntSnowflake >> 17n) & 0b11111n),
+      processId: Number((bigIntSnowflake >> 12n) & 0b11111n),
+      increment: Number(bigIntSnowflake & 0b111111111111n),
+      binary: bigIntSnowflake.toString(2).padStart(64, '0'),
+    };
+  }
+
+  /**
+   * Retrieves the timestamp field's value from a Discord snowflake.
+   * @param {Snowflake} snowflake Snowflake to get the timestamp value from
+   * @returns {number}
+   */
+  static timestampFrom(snowflake) {
+    return Number(BigInt(snowflake) >> 22n) + EPOCH;
+  }
+
+  /**
+   * Discord's epoch value (2015-01-01T00:00:00.000Z).
+   * @type {number}
+   * @readonly
+   */
+  static get EPOCH() {
+    return EPOCH;
+  }
+}
+
+module.exports = SnowflakeUtil;