diff --git a/dist/hashids.js b/dist/hashids.js
index 0e87d34..183999e 100644
--- a/dist/hashids.js
+++ b/dist/hashids.js
@@ -58,12 +58,9 @@
         throw new TypeError("Hashids: Provided alphabet has to be a string (is " + typeof alphabet + ")");
       }
 
-      var saltChars = _toConsumableArray(salt);
-
-      var alphabetChars = _toConsumableArray(alphabet);
-
-      var sepsChars = _toConsumableArray(seps);
-
+      var saltChars = Array.from(salt);
+      var alphabetChars = Array.from(alphabet);
+      var sepsChars = Array.from(seps);
       this.salt = saltChars;
       var uniqueAlphabet = keepUnique(alphabetChars);
 
@@ -106,9 +103,9 @@
         this.alphabet = this.alphabet.slice(guardCount);
       }
 
-      this.guardsRegExp = makeAnyCharRegExp(this.guards);
-      this.sepsRegExp = makeAnyCharRegExp(this.seps);
-      this.allowedCharsRegExp = makeEveryCharRegExp([].concat(_toConsumableArray(this.alphabet), _toConsumableArray(this.guards), _toConsumableArray(this.seps)));
+      this.guardsRegExp = makeAnyOfCharsRegExp(this.guards);
+      this.sepsRegExp = makeAnyOfCharsRegExp(this.seps);
+      this.allowedCharsRegExp = makeAtLeastSomeCharRegExp([].concat(_toConsumableArray(this.alphabet), _toConsumableArray(this.guards), _toConsumableArray(this.seps)));
     }
 
     var _proto = Hashids.prototype;
@@ -205,8 +202,7 @@
       numbers.forEach(function (number, i) {
         var _ret;
 
-        var buffer = lottery.concat(_this.salt, alphabet); // const buffer = [...lottery, ...this.salt, ...alphabet]
-
+        var buffer = lottery.concat(_this.salt, alphabet);
         alphabet = shuffle(alphabet, buffer);
         var last = toAlphabet(number, alphabet);
 
@@ -252,34 +248,20 @@
     };
 
     _proto.isValidId = function isValidId(id) {
-      return this.allowedCharsRegExp.test(id); // return this._isValidId([...id])
-    } // private _isValidId(idChars: string[]): boolean {
-    //   return idChars.every(
-    //     (char) =>
-    //       this.alphabet.includes(char) ||
-    //       this.guards.includes(char) ||
-    //       this.seps.includes(char),
-    //   )
-    // }
-    ;
+      return this.allowedCharsRegExp.test(id);
+    };
 
     _proto._decode = function _decode(id) {
       if (!this.isValidId(id)) {
         throw new Error("The provided ID (" + id + ") is invalid, as it contains characters that do not exist in the alphabet (" + this.guards.join('') + this.seps.join('') + this.alphabet.join('') + ")");
       }
 
-      var idGuardsArray = id.split(this.guardsRegExp); // splitAtMatch(idChars, (char) =>
-      //   this.guards.includes(char),
-      // )
-
+      var idGuardsArray = id.split(this.guardsRegExp);
       var splitIndex = idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0;
       var idBreakdown = idGuardsArray[splitIndex];
       if (idBreakdown.length === 0) return [];
       var lotteryChar = idBreakdown[Symbol.iterator]().next().value;
-      var idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp); // const idBreakdownArray = [...idBreakdown]
-      // const [lotteryChar, ...rest] = idBreakdownArray
-      // const idArray = rest.join('').split(this.sepsRegExp)
-
+      var idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp);
       var lastAlphabet = this.alphabet;
       var result = [];
 
@@ -298,15 +280,12 @@
         var subId = _ref;
         var buffer = [lotteryChar].concat(_toConsumableArray(this.salt), _toConsumableArray(lastAlphabet));
         var nextAlphabet = shuffle(lastAlphabet, buffer.slice(0, lastAlphabet.length));
-        result.push(fromAlphabet(_toConsumableArray(subId), nextAlphabet));
+        result.push(fromAlphabet(Array.from(subId), nextAlphabet));
         lastAlphabet = nextAlphabet;
       } // if the result is different from what we'd expect, we return an empty result (malformed input):
 
 
-      if (this._encode(result).join('') !== id) return []; // if (this._encode(result).some((char, index) => idChars[index] !== char)) {
-      //   return []
-      // }
-
+      if (this._encode(result).join('') !== id) return [];
       return result;
     };
 
@@ -432,7 +411,7 @@
     });
   };
 
-  var makeAnyCharRegExp = function makeAnyCharRegExp(chars) {
+  var makeAnyOfCharsRegExp = function makeAnyOfCharsRegExp(chars) {
     return new RegExp(chars.map(function (char) {
       return escapeRegExp(char);
     }) // we need to sort these from longest to shortest,
@@ -442,7 +421,7 @@
     }).join('|'));
   };
 
-  var makeEveryCharRegExp = function makeEveryCharRegExp(chars) {
+  var makeAtLeastSomeCharRegExp = function makeAtLeastSomeCharRegExp(chars) {
     return new RegExp("^[" + chars.map(function (char) {
       return escapeRegExp(char);
     }) // we need to sort these from longest to shortest,
diff --git a/dist/hashids.js.map b/dist/hashids.js.map
index a37b51a..512bb6e 100644
--- a/dist/hashids.js.map
+++ b/dist/hashids.js.map
@@ -1 +1 @@
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NumberLike = number | bigint\n\nexport default class Hashids {\n  private alphabet: string[]\n  private seps: string[]\n  private guards: string[]\n  private salt: string[]\n  private guardsRegExp: RegExp\n  private sepsRegExp: RegExp\n  private allowedCharsRegExp: RegExp\n\n  public constructor(\n    salt = '',\n    private minLength = 0,\n    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890',\n    seps = 'cfhistuCFHISTU',\n  ) {\n    if (typeof minLength !== 'number') {\n      throw new TypeError(\n        `Hashids: Provided 'minLength' has to be a number (is ${typeof minLength})`,\n      )\n    }\n    if (typeof salt !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided 'salt' has to be a string (is ${typeof salt})`,\n      )\n    }\n    if (typeof alphabet !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided alphabet has to be a string (is ${typeof alphabet})`,\n      )\n    }\n\n    const saltChars = [...salt]\n    const alphabetChars = [...alphabet]\n    const sepsChars = [...seps]\n\n    this.salt = saltChars\n\n    const uniqueAlphabet = keepUnique(alphabetChars)\n\n    if (uniqueAlphabet.length < minAlphabetLength) {\n      throw new Error(\n        `Hashids: alphabet must contain at least ${minAlphabetLength} unique characters, provided: ${uniqueAlphabet}`,\n      )\n    }\n\n    /** `alphabet` should not contains `seps` */\n    this.alphabet = withoutChars(uniqueAlphabet, sepsChars)\n    /** `seps` should contain only characters present in `alphabet` */\n    const filteredSeps = onlyChars(sepsChars, uniqueAlphabet)\n    this.seps = shuffle(filteredSeps, saltChars)\n\n    let sepsLength\n    let diff\n\n    if (\n      this.seps.length === 0 ||\n      this.alphabet.length / this.seps.length > sepDiv\n    ) {\n      sepsLength = Math.ceil(this.alphabet.length / sepDiv)\n\n      if (sepsLength > this.seps.length) {\n        diff = sepsLength - this.seps.length\n        this.seps.push(...this.alphabet.slice(0, diff))\n        this.alphabet = this.alphabet.slice(diff)\n      }\n    }\n\n    this.alphabet = shuffle(this.alphabet, saltChars)\n    const guardCount = Math.ceil(this.alphabet.length / guardDiv)\n\n    if (this.alphabet.length < 3) {\n      this.guards = this.seps.slice(0, guardCount)\n      this.seps = this.seps.slice(guardCount)\n    } else {\n      this.guards = this.alphabet.slice(0, guardCount)\n      this.alphabet = this.alphabet.slice(guardCount)\n    }\n\n    this.guardsRegExp = makeAnyCharRegExp(this.guards)\n    this.sepsRegExp = makeAnyCharRegExp(this.seps)\n    this.allowedCharsRegExp = makeEveryCharRegExp([\n      ...this.alphabet,\n      ...this.guards,\n      ...this.seps,\n    ])\n  }\n\n  public encode(numbers: string): string\n  public encode(numbers: NumberLike[]): string\n  public encode(...numbers: NumberLike[]): string\n  public encode(numbers: string[]): string\n  public encode(...numbers: string[]): string\n  public encode<T extends string | NumberLike>(\n    first: T[] | T,\n    ...numbers: T[]\n  ): string {\n    const ret = ''\n\n    if (Array.isArray(first)) {\n      numbers = first\n    } else {\n      // eslint-disable-next-line eqeqeq\n      numbers = [...(first != null ? [first] : []), ...numbers]\n    }\n\n    if (!numbers.length) {\n      return ret\n    }\n\n    if (!numbers.every(isIntegerNumber)) {\n      numbers = numbers.map((n) =>\n        typeof n === 'bigint' || typeof n === 'number'\n          ? n\n          : safeParseInt10(String(n)),\n      ) as T[]\n    }\n\n    if (!(numbers as NumberLike[]).every(isPositiveAndFinite)) {\n      return ret\n    }\n\n    return this._encode(numbers as number[]).join('')\n  }\n\n  public decode(id: string): NumberLike[] {\n    if (!id || typeof id !== 'string' || id.length === 0) return []\n    return this._decode(id)\n  }\n\n  /**\n   * @description Splits a hex string into groups of 12-digit hexadecimal numbers,\n   * then prefixes each with '1' and encodes the resulting array of numbers\n   *\n   * Encoding '00000000000f00000000000f000f' would be the equivalent of:\n   * Hashids.encode([0x100000000000f, 0x100000000000f, 0x1000f])\n   *\n   * This means that if your environment supports BigInts,\n   * you will get different (shorter) results if you provide\n   * a BigInt representation of your hex and use `encode` directly, e.g.:\n   * Hashids.encode(BigInt(`0x${hex}`))\n   *\n   * To decode such a representation back to a hex string, use the following snippet:\n   * Hashids.decode(id)[0].toString(16)\n   */\n  public encodeHex(hex: string | bigint): string {\n    switch (typeof hex) {\n      case 'bigint':\n        hex = hex.toString(16)\n        break\n      case 'string':\n        if (!/^[0-9a-fA-F]+$/.test(hex)) return ''\n        break\n      default:\n        throw new Error(\n          `Hashids: The provided value is neither a string, nor a BigInt (got: ${typeof hex})`,\n        )\n    }\n\n    const numbers = splitAtIntervalAndMap(hex, 12, (part) =>\n      parseInt(`1${part}`, 16),\n    )\n    return this.encode(numbers)\n  }\n\n  public decodeHex(id: string) {\n    return this.decode(id)\n      .map((number) => number.toString(16).slice(1))\n      .join('')\n  }\n\n  private _encode(numbers: NumberLike[]): string[] {\n    let alphabet = this.alphabet\n\n    const numbersIdInt = numbers.reduce<number>(\n      (last, number, i) =>\n        last +\n        (typeof number === 'bigint'\n          ? Number(number % BigInt(i + 100))\n          : number % (i + 100)),\n      0,\n    )\n\n    let ret: string[] = [alphabet[numbersIdInt % alphabet.length]]\n    const lottery = ret.slice()\n\n    const seps = this.seps\n    const guards = this.guards\n\n    numbers.forEach((number, i) => {\n      const buffer = lottery.concat(this.salt, alphabet)\n      // const buffer = [...lottery, ...this.salt, ...alphabet]\n\n      alphabet = shuffle(alphabet, buffer)\n      const last = toAlphabet(number, alphabet)\n\n      ret.push(...last)\n\n      if (i + 1 < numbers.length) {\n        const charCode = last[0].codePointAt(0)! + i\n        const extraNumber =\n          typeof number === 'bigint'\n            ? Number(number % BigInt(charCode))\n            : number % charCode\n        ret.push(seps[extraNumber % seps.length])\n      }\n    })\n\n    if (ret.length < this.minLength) {\n      const prefixGuardIndex =\n        (numbersIdInt + ret[0].codePointAt(0)!) % guards.length\n      ret.unshift(guards[prefixGuardIndex])\n\n      if (ret.length < this.minLength) {\n        const suffixGuardIndex =\n          (numbersIdInt + ret[2].codePointAt(0)!) % guards.length\n        ret.push(guards[suffixGuardIndex])\n      }\n    }\n\n    const halfLength = Math.floor(alphabet.length / 2)\n    while (ret.length < this.minLength) {\n      alphabet = shuffle(alphabet, alphabet)\n      ret.unshift(...alphabet.slice(halfLength))\n      ret.push(...alphabet.slice(0, halfLength))\n\n      const excess = ret.length - this.minLength\n      if (excess > 0) {\n        const halfOfExcess = excess / 2\n        ret = ret.slice(halfOfExcess, halfOfExcess + this.minLength)\n      }\n    }\n\n    return ret\n  }\n\n  public isValidId(id: string): boolean {\n    return this.allowedCharsRegExp.test(id)\n    // return this._isValidId([...id])\n  }\n\n  // private _isValidId(idChars: string[]): boolean {\n  //   return idChars.every(\n  //     (char) =>\n  //       this.alphabet.includes(char) ||\n  //       this.guards.includes(char) ||\n  //       this.seps.includes(char),\n  //   )\n  // }\n\n  private _decode(id: string): NumberLike[] {\n    if (!this.isValidId(id)) {\n      throw new Error(\n        `The provided ID (${id}) is invalid, as it contains characters that do not exist in the alphabet (${this.guards.join(\n          '',\n        )}${this.seps.join('')}${this.alphabet.join('')})`,\n      )\n    }\n    const idGuardsArray = id.split(this.guardsRegExp)\n    // splitAtMatch(idChars, (char) =>\n    //   this.guards.includes(char),\n    // )\n    const splitIndex =\n      idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0\n\n    const idBreakdown = idGuardsArray[splitIndex]\n    if (idBreakdown.length === 0) return []\n\n    const lotteryChar = idBreakdown[Symbol.iterator]().next().value as string\n    const idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp)\n\n    // const idBreakdownArray = [...idBreakdown]\n    // const [lotteryChar, ...rest] = idBreakdownArray\n    // const idArray = rest.join('').split(this.sepsRegExp)\n\n    let lastAlphabet: string[] = this.alphabet\n    const result: NumberLike[] = []\n\n    for (const subId of idArray) {\n      const buffer = [lotteryChar, ...this.salt, ...lastAlphabet]\n      const nextAlphabet = shuffle(\n        lastAlphabet,\n        buffer.slice(0, lastAlphabet.length),\n      )\n      result.push(fromAlphabet([...subId], nextAlphabet))\n      lastAlphabet = nextAlphabet\n    }\n\n    // if the result is different from what we'd expect, we return an empty result (malformed input):\n    if (this._encode(result).join('') !== id) return []\n    // if (this._encode(result).some((char, index) => idChars[index] !== char)) {\n    //   return []\n    // }\n    return result\n  }\n}\n\nconst minAlphabetLength = 16\nconst sepDiv = 3.5\nconst guardDiv = 12\n\nexport const keepUnique = <T>(content: Iterable<T>): T[] =>\n  Array.from(new Set(content))\n\nexport const withoutChars = (\n  chars: string[],\n  withoutChars: string[],\n): string[] => chars.filter((char) => !withoutChars.includes(char))\n\nexport const onlyChars = (chars: string[], keepChars: string[]): string[] =>\n  chars.filter((char) => keepChars.includes(char))\n\nconst isIntegerNumber = (n: NumberLike | string) =>\n  typeof n === 'bigint' ||\n  (!Number.isNaN(Number(n)) && Math.floor(Number(n)) === n)\n\nconst isPositiveAndFinite = (n: NumberLike) =>\n  typeof n === 'bigint' || (n >= 0 && Number.isSafeInteger(n))\n\nfunction shuffle(alphabetChars: string[], saltChars: string[]): string[] {\n  if (saltChars.length === 0) {\n    return alphabetChars\n  }\n\n  let integer: number\n  const transformed = alphabetChars.slice()\n\n  for (let i = transformed.length - 1, v = 0, p = 0; i > 0; i--, v++) {\n    v %= saltChars.length\n    p += integer = saltChars[v].codePointAt(0)!\n    const j = (integer + v + p) % i\n\n    // swap characters at positions i and j\n    const a = transformed[i]\n    const b = transformed[j]\n    transformed[j] = a\n    transformed[i] = b\n  }\n\n  return transformed\n}\n\nconst toAlphabet = (input: NumberLike, alphabetChars: string[]): string[] => {\n  const id: string[] = []\n\n  if (typeof input === 'bigint') {\n    const alphabetLength = BigInt(alphabetChars.length)\n    do {\n      id.unshift(alphabetChars[Number(input % alphabetLength)])\n      input = input / alphabetLength\n    } while (input > BigInt(0))\n  } else {\n    do {\n      id.unshift(alphabetChars[input % alphabetChars.length])\n      input = Math.floor(input / alphabetChars.length)\n    } while (input > 0)\n  }\n\n  return id\n}\n\nconst fromAlphabet = (\n  inputChars: string[],\n  alphabetChars: string[],\n): NumberLike =>\n  inputChars.reduce((carry, item) => {\n    const index = alphabetChars.indexOf(item)\n    if (index === -1) {\n      throw new Error(\n        `The provided ID (${inputChars.join(\n          '',\n        )}) is invalid, as it contains characters that do not exist in the alphabet (${alphabetChars.join(\n          '',\n        )})`,\n      )\n    }\n    if (typeof carry === 'bigint') {\n      return carry * BigInt(alphabetChars.length) + BigInt(index)\n    }\n    const value = carry * alphabetChars.length + index\n    const isSafeValue = Number.isSafeInteger(value)\n    if (isSafeValue) {\n      return value\n    } else {\n      if (typeof BigInt === 'function') {\n        return BigInt(carry) * BigInt(alphabetChars.length) + BigInt(index)\n      } else {\n        // we do not have support for BigInt:\n        throw new Error(\n          `Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment`,\n        )\n      }\n    }\n  }, 0 as NumberLike)\n\nconst safeToParseNumberRegExp = /^\\+?[0-9]+$/\nconst safeParseInt10 = (str: string) =>\n  safeToParseNumberRegExp.test(str) ? parseInt(str, 10) : NaN\n\nconst splitAtIntervalAndMap = <T>(\n  str: string,\n  nth: number,\n  map: (n: string) => T,\n): T[] =>\n  Array.from<never, T>({length: Math.ceil(str.length / nth)}, (_, index) =>\n    map(str.slice(index * nth, (index + 1) * nth)),\n  )\n\nconst makeAnyCharRegExp = (chars: string[]) =>\n  new RegExp(\n    chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('|'),\n  )\n\nconst makeEveryCharRegExp = (chars: string[]) =>\n  new RegExp(\n    `^[${chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('')}]+$`,\n  )\n\nconst escapeRegExp = (text: string) =>\n  text.replace(/[-[\\]{}()*+?.,\\\\^$|#\\s]/g, '\\\\$&')\n"]}
\ No newline at end of file
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NumberLike = number | bigint\n\nexport default class Hashids {\n  private alphabet: string[]\n  private seps: string[]\n  private guards: string[]\n  private salt: string[]\n  private guardsRegExp: RegExp\n  private sepsRegExp: RegExp\n  private allowedCharsRegExp: RegExp\n\n  public constructor(\n    salt = '',\n    private minLength = 0,\n    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890',\n    seps = 'cfhistuCFHISTU',\n  ) {\n    if (typeof minLength !== 'number') {\n      throw new TypeError(\n        `Hashids: Provided 'minLength' has to be a number (is ${typeof minLength})`,\n      )\n    }\n    if (typeof salt !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided 'salt' has to be a string (is ${typeof salt})`,\n      )\n    }\n    if (typeof alphabet !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided alphabet has to be a string (is ${typeof alphabet})`,\n      )\n    }\n\n    const saltChars = Array.from(salt)\n    const alphabetChars = Array.from(alphabet)\n    const sepsChars = Array.from(seps)\n\n    this.salt = saltChars\n\n    const uniqueAlphabet = keepUnique(alphabetChars)\n\n    if (uniqueAlphabet.length < minAlphabetLength) {\n      throw new Error(\n        `Hashids: alphabet must contain at least ${minAlphabetLength} unique characters, provided: ${uniqueAlphabet}`,\n      )\n    }\n\n    /** `alphabet` should not contains `seps` */\n    this.alphabet = withoutChars(uniqueAlphabet, sepsChars)\n    /** `seps` should contain only characters present in `alphabet` */\n    const filteredSeps = onlyChars(sepsChars, uniqueAlphabet)\n    this.seps = shuffle(filteredSeps, saltChars)\n\n    let sepsLength\n    let diff\n\n    if (\n      this.seps.length === 0 ||\n      this.alphabet.length / this.seps.length > sepDiv\n    ) {\n      sepsLength = Math.ceil(this.alphabet.length / sepDiv)\n\n      if (sepsLength > this.seps.length) {\n        diff = sepsLength - this.seps.length\n        this.seps.push(...this.alphabet.slice(0, diff))\n        this.alphabet = this.alphabet.slice(diff)\n      }\n    }\n\n    this.alphabet = shuffle(this.alphabet, saltChars)\n    const guardCount = Math.ceil(this.alphabet.length / guardDiv)\n\n    if (this.alphabet.length < 3) {\n      this.guards = this.seps.slice(0, guardCount)\n      this.seps = this.seps.slice(guardCount)\n    } else {\n      this.guards = this.alphabet.slice(0, guardCount)\n      this.alphabet = this.alphabet.slice(guardCount)\n    }\n\n    this.guardsRegExp = makeAnyOfCharsRegExp(this.guards)\n    this.sepsRegExp = makeAnyOfCharsRegExp(this.seps)\n    this.allowedCharsRegExp = makeAtLeastSomeCharRegExp([\n      ...this.alphabet,\n      ...this.guards,\n      ...this.seps,\n    ])\n  }\n\n  public encode(numbers: string): string\n  public encode(numbers: NumberLike[]): string\n  public encode(...numbers: NumberLike[]): string\n  public encode(numbers: string[]): string\n  public encode(...numbers: string[]): string\n  public encode<T extends string | NumberLike>(\n    first: T[] | T,\n    ...numbers: T[]\n  ): string {\n    const ret = ''\n\n    if (Array.isArray(first)) {\n      numbers = first\n    } else {\n      // eslint-disable-next-line eqeqeq\n      numbers = [...(first != null ? [first] : []), ...numbers]\n    }\n\n    if (!numbers.length) {\n      return ret\n    }\n\n    if (!numbers.every(isIntegerNumber)) {\n      numbers = numbers.map((n) =>\n        typeof n === 'bigint' || typeof n === 'number'\n          ? n\n          : safeParseInt10(String(n)),\n      ) as T[]\n    }\n\n    if (!(numbers as NumberLike[]).every(isPositiveAndFinite)) {\n      return ret\n    }\n\n    return this._encode(numbers as number[]).join('')\n  }\n\n  public decode(id: string): NumberLike[] {\n    if (!id || typeof id !== 'string' || id.length === 0) return []\n    return this._decode(id)\n  }\n\n  /**\n   * @description Splits a hex string into groups of 12-digit hexadecimal numbers,\n   * then prefixes each with '1' and encodes the resulting array of numbers\n   *\n   * Encoding '00000000000f00000000000f000f' would be the equivalent of:\n   * Hashids.encode([0x100000000000f, 0x100000000000f, 0x1000f])\n   *\n   * This means that if your environment supports BigInts,\n   * you will get different (shorter) results if you provide\n   * a BigInt representation of your hex and use `encode` directly, e.g.:\n   * Hashids.encode(BigInt(`0x${hex}`))\n   *\n   * To decode such a representation back to a hex string, use the following snippet:\n   * Hashids.decode(id)[0].toString(16)\n   */\n  public encodeHex(hex: string | bigint): string {\n    switch (typeof hex) {\n      case 'bigint':\n        hex = hex.toString(16)\n        break\n      case 'string':\n        if (!/^[0-9a-fA-F]+$/.test(hex)) return ''\n        break\n      default:\n        throw new Error(\n          `Hashids: The provided value is neither a string, nor a BigInt (got: ${typeof hex})`,\n        )\n    }\n\n    const numbers = splitAtIntervalAndMap(hex, 12, (part) =>\n      parseInt(`1${part}`, 16),\n    )\n    return this.encode(numbers)\n  }\n\n  public decodeHex(id: string) {\n    return this.decode(id)\n      .map((number) => number.toString(16).slice(1))\n      .join('')\n  }\n\n  private _encode(numbers: NumberLike[]): string[] {\n    let alphabet = this.alphabet\n\n    const numbersIdInt = numbers.reduce<number>(\n      (last, number, i) =>\n        last +\n        (typeof number === 'bigint'\n          ? Number(number % BigInt(i + 100))\n          : number % (i + 100)),\n      0,\n    )\n\n    let ret: string[] = [alphabet[numbersIdInt % alphabet.length]]\n    const lottery = ret.slice()\n\n    const seps = this.seps\n    const guards = this.guards\n\n    numbers.forEach((number, i) => {\n      const buffer = lottery.concat(this.salt, alphabet)\n\n      alphabet = shuffle(alphabet, buffer)\n      const last = toAlphabet(number, alphabet)\n\n      ret.push(...last)\n\n      if (i + 1 < numbers.length) {\n        const charCode = last[0].codePointAt(0)! + i\n        const extraNumber =\n          typeof number === 'bigint'\n            ? Number(number % BigInt(charCode))\n            : number % charCode\n        ret.push(seps[extraNumber % seps.length])\n      }\n    })\n\n    if (ret.length < this.minLength) {\n      const prefixGuardIndex =\n        (numbersIdInt + ret[0].codePointAt(0)!) % guards.length\n      ret.unshift(guards[prefixGuardIndex])\n\n      if (ret.length < this.minLength) {\n        const suffixGuardIndex =\n          (numbersIdInt + ret[2].codePointAt(0)!) % guards.length\n        ret.push(guards[suffixGuardIndex])\n      }\n    }\n\n    const halfLength = Math.floor(alphabet.length / 2)\n    while (ret.length < this.minLength) {\n      alphabet = shuffle(alphabet, alphabet)\n      ret.unshift(...alphabet.slice(halfLength))\n      ret.push(...alphabet.slice(0, halfLength))\n\n      const excess = ret.length - this.minLength\n      if (excess > 0) {\n        const halfOfExcess = excess / 2\n        ret = ret.slice(halfOfExcess, halfOfExcess + this.minLength)\n      }\n    }\n\n    return ret\n  }\n\n  public isValidId(id: string): boolean {\n    return this.allowedCharsRegExp.test(id)\n  }\n\n  private _decode(id: string): NumberLike[] {\n    if (!this.isValidId(id)) {\n      throw new Error(\n        `The provided ID (${id}) is invalid, as it contains characters that do not exist in the alphabet (${this.guards.join(\n          '',\n        )}${this.seps.join('')}${this.alphabet.join('')})`,\n      )\n    }\n    const idGuardsArray = id.split(this.guardsRegExp)\n    const splitIndex =\n      idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0\n\n    const idBreakdown = idGuardsArray[splitIndex]\n    if (idBreakdown.length === 0) return []\n\n    const lotteryChar = idBreakdown[Symbol.iterator]().next().value as string\n    const idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp)\n\n    let lastAlphabet: string[] = this.alphabet\n    const result: NumberLike[] = []\n\n    for (const subId of idArray) {\n      const buffer = [lotteryChar, ...this.salt, ...lastAlphabet]\n      const nextAlphabet = shuffle(\n        lastAlphabet,\n        buffer.slice(0, lastAlphabet.length),\n      )\n      result.push(fromAlphabet(Array.from(subId), nextAlphabet))\n      lastAlphabet = nextAlphabet\n    }\n\n    // if the result is different from what we'd expect, we return an empty result (malformed input):\n    if (this._encode(result).join('') !== id) return []\n    return result\n  }\n}\n\nconst minAlphabetLength = 16\nconst sepDiv = 3.5\nconst guardDiv = 12\n\nexport const keepUnique = <T>(content: Iterable<T>): T[] =>\n  Array.from(new Set(content))\n\nexport const withoutChars = (\n  chars: string[],\n  withoutChars: string[],\n): string[] => chars.filter((char) => !withoutChars.includes(char))\n\nexport const onlyChars = (chars: string[], keepChars: string[]): string[] =>\n  chars.filter((char) => keepChars.includes(char))\n\nconst isIntegerNumber = (n: NumberLike | string) =>\n  typeof n === 'bigint' ||\n  (!Number.isNaN(Number(n)) && Math.floor(Number(n)) === n)\n\nconst isPositiveAndFinite = (n: NumberLike) =>\n  typeof n === 'bigint' || (n >= 0 && Number.isSafeInteger(n))\n\nfunction shuffle(alphabetChars: string[], saltChars: string[]): string[] {\n  if (saltChars.length === 0) {\n    return alphabetChars\n  }\n\n  let integer: number\n  const transformed = alphabetChars.slice()\n\n  for (let i = transformed.length - 1, v = 0, p = 0; i > 0; i--, v++) {\n    v %= saltChars.length\n    p += integer = saltChars[v].codePointAt(0)!\n    const j = (integer + v + p) % i\n\n    // swap characters at positions i and j\n    const a = transformed[i]\n    const b = transformed[j]\n    transformed[j] = a\n    transformed[i] = b\n  }\n\n  return transformed\n}\n\nconst toAlphabet = (input: NumberLike, alphabetChars: string[]): string[] => {\n  const id: string[] = []\n\n  if (typeof input === 'bigint') {\n    const alphabetLength = BigInt(alphabetChars.length)\n    do {\n      id.unshift(alphabetChars[Number(input % alphabetLength)])\n      input = input / alphabetLength\n    } while (input > BigInt(0))\n  } else {\n    do {\n      id.unshift(alphabetChars[input % alphabetChars.length])\n      input = Math.floor(input / alphabetChars.length)\n    } while (input > 0)\n  }\n\n  return id\n}\n\nconst fromAlphabet = (\n  inputChars: string[],\n  alphabetChars: string[],\n): NumberLike =>\n  inputChars.reduce((carry, item) => {\n    const index = alphabetChars.indexOf(item)\n    if (index === -1) {\n      throw new Error(\n        `The provided ID (${inputChars.join(\n          '',\n        )}) is invalid, as it contains characters that do not exist in the alphabet (${alphabetChars.join(\n          '',\n        )})`,\n      )\n    }\n    if (typeof carry === 'bigint') {\n      return carry * BigInt(alphabetChars.length) + BigInt(index)\n    }\n    const value = carry * alphabetChars.length + index\n    const isSafeValue = Number.isSafeInteger(value)\n    if (isSafeValue) {\n      return value\n    } else {\n      if (typeof BigInt === 'function') {\n        return BigInt(carry) * BigInt(alphabetChars.length) + BigInt(index)\n      } else {\n        // we do not have support for BigInt:\n        throw new Error(\n          `Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment`,\n        )\n      }\n    }\n  }, 0 as NumberLike)\n\nconst safeToParseNumberRegExp = /^\\+?[0-9]+$/\nconst safeParseInt10 = (str: string) =>\n  safeToParseNumberRegExp.test(str) ? parseInt(str, 10) : NaN\n\nconst splitAtIntervalAndMap = <T>(\n  str: string,\n  nth: number,\n  map: (n: string) => T,\n): T[] =>\n  Array.from<never, T>({length: Math.ceil(str.length / nth)}, (_, index) =>\n    map(str.slice(index * nth, (index + 1) * nth)),\n  )\n\nconst makeAnyOfCharsRegExp = (chars: string[]) =>\n  new RegExp(\n    chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('|'),\n  )\n\nconst makeAtLeastSomeCharRegExp = (chars: string[]) =>\n  new RegExp(\n    `^[${chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('')}]+$`,\n  )\n\nconst escapeRegExp = (text: string) =>\n  text.replace(/[-[\\]{}()*+?.,\\\\^$|#\\s]/g, '\\\\$&')\n"]}
\ No newline at end of file
diff --git a/dist/hashids.min.js b/dist/hashids.min.js
index 8ffe330..b5a1320 100644
--- a/dist/hashids.min.js
+++ b/dist/hashids.min.js
@@ -1,2 +1,2 @@
-!function(t,e){if("function"==typeof define&&define.amd)define("Hashids",["exports"],e);else if("undefined"!=typeof exports)e(exports);else{var n={exports:{}};e(n.exports),t.Hashids=n.exports}}("undefined"!=typeof globalThis?globalThis:"undefined"!=typeof self?self:this,(function(t){"use strict";function e(t){return function(t){if(Array.isArray(t)){for(var e=0,n=new Array(t.length);e<t.length;e++)n[e]=t[e];return n}}(t)||function(t){if(Symbol.iterator in Object(t)||"[object Arguments]"===Object.prototype.toString.call(t))return Array.from(t)}(t)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}t.__esModule=!0,t.onlyChars=t.withoutChars=t.keepUnique=t.default=void 0;var n=function(){function t(t,n,l,u){if(void 0===t&&(t=""),void 0===n&&(n=0),void 0===l&&(l="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"),void 0===u&&(u="cfhistuCFHISTU"),this.minLength=n,"number"!=typeof n)throw new TypeError("Hashids: Provided 'minLength' has to be a number (is "+typeof n+")");if("string"!=typeof t)throw new TypeError("Hashids: Provided 'salt' has to be a string (is "+typeof t+")");if("string"!=typeof l)throw new TypeError("Hashids: Provided alphabet has to be a string (is "+typeof l+")");var p=e(t),c=e(l),g=e(u);this.salt=p;var d=o(c);if(d.length<i)throw new Error("Hashids: alphabet must contain at least "+i+" unique characters, provided: "+d);this.alphabet=a(d,g);var b,m,w,I=h(g,d);(this.seps=f(I,p),0===this.seps.length||this.alphabet.length/this.seps.length>r)&&((b=Math.ceil(this.alphabet.length/r))>this.seps.length&&(m=b-this.seps.length,(w=this.seps).push.apply(w,e(this.alphabet.slice(0,m))),this.alphabet=this.alphabet.slice(m)));this.alphabet=f(this.alphabet,p);var x=Math.ceil(this.alphabet.length/s);this.alphabet.length<3?(this.guards=this.seps.slice(0,x),this.seps=this.seps.slice(x)):(this.guards=this.alphabet.slice(0,x),this.alphabet=this.alphabet.slice(x)),this.guardsRegExp=v(this.guards),this.sepsRegExp=v(this.seps),this.allowedCharsRegExp=y([].concat(e(this.alphabet),e(this.guards),e(this.seps)))}var n=t.prototype;return n.encode=function(t){for(var n=arguments.length,i=new Array(n>1?n-1:0),r=1;r<n;r++)i[r-1]=arguments[r];var s="";return(i=Array.isArray(t)?t:[].concat(e(null!=t?[t]:[]),e(i))).length?(i.every(l)||(i=i.map((function(t){return"bigint"==typeof t||"number"==typeof t?t:d(String(t))}))),i.every(u)?this._encode(i).join(""):s):s},n.decode=function(t){return t&&"string"==typeof t&&0!==t.length?this._decode(t):[]},n.encodeHex=function(t){switch(typeof t){case"bigint":t=t.toString(16);break;case"string":if(!/^[0-9a-fA-F]+$/.test(t))return"";break;default:throw new Error("Hashids: The provided value is neither a string, nor a BigInt (got: "+typeof t+")")}var e=b(t,12,(function(t){return parseInt("1"+t,16)}));return this.encode(e)},n.decodeHex=function(t){return this.decode(t).map((function(t){return t.toString(16).slice(1)})).join("")},n._encode=function(t){var n=this,i=this.alphabet,r=t.reduce((function(t,e,n){return t+("bigint"==typeof e?Number(e%BigInt(n+100)):e%(n+100))}),0),s=[i[r%i.length]],o=s.slice(),a=this.seps,h=this.guards;if(t.forEach((function(r,h){var l,u=o.concat(n.salt,i);i=f(i,u);var c=p(r,i);if((l=s).push.apply(l,e(c)),h+1<t.length){var g=c[0].codePointAt(0)+h,d="bigint"==typeof r?Number(r%BigInt(g)):r%g;s.push(a[d%a.length])}})),s.length<this.minLength){var l=(r+s[0].codePointAt(0))%h.length;if(s.unshift(h[l]),s.length<this.minLength){var u=(r+s[2].codePointAt(0))%h.length;s.push(h[u])}}for(var c=Math.floor(i.length/2);s.length<this.minLength;){var g,d;i=f(i,i),(g=s).unshift.apply(g,e(i.slice(c))),(d=s).push.apply(d,e(i.slice(0,c)));var b=s.length-this.minLength;if(b>0){var v=b/2;s=s.slice(v,v+this.minLength)}}return s},n.isValidId=function(t){return this.allowedCharsRegExp.test(t)},n._decode=function(t){if(!this.isValidId(t))throw new Error("The provided ID ("+t+") is invalid, as it contains characters that do not exist in the alphabet ("+this.guards.join("")+this.seps.join("")+this.alphabet.join("")+")");var n=t.split(this.guardsRegExp),i=n[3===n.length||2===n.length?1:0];if(0===i.length)return[];var r=i[Symbol.iterator]().next().value,s=i.slice(r.length).split(this.sepsRegExp),o=this.alphabet,a=[],h=s,l=Array.isArray(h),u=0;for(h=l?h:h[Symbol.iterator]();;){var p;if(l){if(u>=h.length)break;p=h[u++]}else{if((u=h.next()).done)break;p=u.value}var g=p,d=f(o,[r].concat(e(this.salt),e(o)).slice(0,o.length));a.push(c(e(g),d)),o=d}return this._encode(a).join("")!==t?[]:a},t}();t.default=n;var i=16,r=3.5,s=12,o=function(t){return Array.from(new Set(t))};t.keepUnique=o;var a=function(t,e){return t.filter((function(t){return!e.includes(t)}))};t.withoutChars=a;var h=function(t,e){return t.filter((function(t){return e.includes(t)}))};t.onlyChars=h;var l=function(t){return"bigint"==typeof t||!Number.isNaN(Number(t))&&Math.floor(Number(t))===t},u=function(t){return"bigint"==typeof t||t>=0&&Number.isSafeInteger(t)};function f(t,e){if(0===e.length)return t;for(var n,i=t.slice(),r=i.length-1,s=0,o=0;r>0;r--,s++){o+=n=e[s%=e.length].codePointAt(0);var a=(n+s+o)%r,h=i[r],l=i[a];i[a]=h,i[r]=l}return i}var p=function(t,e){var n=[];if("bigint"==typeof t){var i=BigInt(e.length);do{n.unshift(e[Number(t%i)]),t/=i}while(t>BigInt(0))}else do{n.unshift(e[t%e.length]),t=Math.floor(t/e.length)}while(t>0);return n},c=function(t,e){return t.reduce((function(n,i){var r=e.indexOf(i);if(-1===r)throw new Error("The provided ID ("+t.join("")+") is invalid, as it contains characters that do not exist in the alphabet ("+e.join("")+")");if("bigint"==typeof n)return n*BigInt(e.length)+BigInt(r);var s=n*e.length+r;if(Number.isSafeInteger(s))return s;if("function"==typeof BigInt)return BigInt(n)*BigInt(e.length)+BigInt(r);throw new Error("Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment")}),0)},g=/^\+?[0-9]+$/,d=function(t){return g.test(t)?parseInt(t,10):NaN},b=function(t,e,n){return Array.from({length:Math.ceil(t.length/e)},(function(i,r){return n(t.slice(r*e,(r+1)*e))}))},v=function(t){return new RegExp(t.map((function(t){return m(t)})).sort((function(t,e){return e.length-t.length})).join("|"))},y=function(t){return new RegExp("^["+t.map((function(t){return m(t)})).sort((function(t,e){return e.length-t.length})).join("")+"]+$")},m=function(t){return t.replace(/[-[\]{}()*+?.,\\^$|#\s]/g,"\\$&")}}));
+!function(t,e){if("function"==typeof define&&define.amd)define("Hashids",["exports"],e);else if("undefined"!=typeof exports)e(exports);else{var n={exports:{}};e(n.exports),t.Hashids=n.exports}}("undefined"!=typeof globalThis?globalThis:"undefined"!=typeof self?self:this,(function(t){"use strict";function e(t){return function(t){if(Array.isArray(t)){for(var e=0,n=new Array(t.length);e<t.length;e++)n[e]=t[e];return n}}(t)||function(t){if(Symbol.iterator in Object(t)||"[object Arguments]"===Object.prototype.toString.call(t))return Array.from(t)}(t)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance")}()}t.__esModule=!0,t.onlyChars=t.withoutChars=t.keepUnique=t.default=void 0;var n=function(){function t(t,n,l,u){if(void 0===t&&(t=""),void 0===n&&(n=0),void 0===l&&(l="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"),void 0===u&&(u="cfhistuCFHISTU"),this.minLength=n,"number"!=typeof n)throw new TypeError("Hashids: Provided 'minLength' has to be a number (is "+typeof n+")");if("string"!=typeof t)throw new TypeError("Hashids: Provided 'salt' has to be a string (is "+typeof t+")");if("string"!=typeof l)throw new TypeError("Hashids: Provided alphabet has to be a string (is "+typeof l+")");var p=Array.from(t),c=Array.from(l),g=Array.from(u);this.salt=p;var d=o(c);if(d.length<r)throw new Error("Hashids: alphabet must contain at least "+r+" unique characters, provided: "+d);this.alphabet=a(d,g);var b,m,w,I=h(g,d);(this.seps=f(I,p),0===this.seps.length||this.alphabet.length/this.seps.length>i)&&((b=Math.ceil(this.alphabet.length/i))>this.seps.length&&(m=b-this.seps.length,(w=this.seps).push.apply(w,e(this.alphabet.slice(0,m))),this.alphabet=this.alphabet.slice(m)));this.alphabet=f(this.alphabet,p);var x=Math.ceil(this.alphabet.length/s);this.alphabet.length<3?(this.guards=this.seps.slice(0,x),this.seps=this.seps.slice(x)):(this.guards=this.alphabet.slice(0,x),this.alphabet=this.alphabet.slice(x)),this.guardsRegExp=v(this.guards),this.sepsRegExp=v(this.seps),this.allowedCharsRegExp=y([].concat(e(this.alphabet),e(this.guards),e(this.seps)))}var n=t.prototype;return n.encode=function(t){for(var n=arguments.length,r=new Array(n>1?n-1:0),i=1;i<n;i++)r[i-1]=arguments[i];var s="";return(r=Array.isArray(t)?t:[].concat(e(null!=t?[t]:[]),e(r))).length?(r.every(l)||(r=r.map((function(t){return"bigint"==typeof t||"number"==typeof t?t:d(String(t))}))),r.every(u)?this._encode(r).join(""):s):s},n.decode=function(t){return t&&"string"==typeof t&&0!==t.length?this._decode(t):[]},n.encodeHex=function(t){switch(typeof t){case"bigint":t=t.toString(16);break;case"string":if(!/^[0-9a-fA-F]+$/.test(t))return"";break;default:throw new Error("Hashids: The provided value is neither a string, nor a BigInt (got: "+typeof t+")")}var e=b(t,12,(function(t){return parseInt("1"+t,16)}));return this.encode(e)},n.decodeHex=function(t){return this.decode(t).map((function(t){return t.toString(16).slice(1)})).join("")},n._encode=function(t){var n=this,r=this.alphabet,i=t.reduce((function(t,e,n){return t+("bigint"==typeof e?Number(e%BigInt(n+100)):e%(n+100))}),0),s=[r[i%r.length]],o=s.slice(),a=this.seps,h=this.guards;if(t.forEach((function(i,h){var l,u=o.concat(n.salt,r);r=f(r,u);var c=p(i,r);if((l=s).push.apply(l,e(c)),h+1<t.length){var g=c[0].codePointAt(0)+h,d="bigint"==typeof i?Number(i%BigInt(g)):i%g;s.push(a[d%a.length])}})),s.length<this.minLength){var l=(i+s[0].codePointAt(0))%h.length;if(s.unshift(h[l]),s.length<this.minLength){var u=(i+s[2].codePointAt(0))%h.length;s.push(h[u])}}for(var c=Math.floor(r.length/2);s.length<this.minLength;){var g,d;r=f(r,r),(g=s).unshift.apply(g,e(r.slice(c))),(d=s).push.apply(d,e(r.slice(0,c)));var b=s.length-this.minLength;if(b>0){var v=b/2;s=s.slice(v,v+this.minLength)}}return s},n.isValidId=function(t){return this.allowedCharsRegExp.test(t)},n._decode=function(t){if(!this.isValidId(t))throw new Error("The provided ID ("+t+") is invalid, as it contains characters that do not exist in the alphabet ("+this.guards.join("")+this.seps.join("")+this.alphabet.join("")+")");var n=t.split(this.guardsRegExp),r=n[3===n.length||2===n.length?1:0];if(0===r.length)return[];var i=r[Symbol.iterator]().next().value,s=r.slice(i.length).split(this.sepsRegExp),o=this.alphabet,a=[],h=s,l=Array.isArray(h),u=0;for(h=l?h:h[Symbol.iterator]();;){var p;if(l){if(u>=h.length)break;p=h[u++]}else{if((u=h.next()).done)break;p=u.value}var g=p,d=f(o,[i].concat(e(this.salt),e(o)).slice(0,o.length));a.push(c(Array.from(g),d)),o=d}return this._encode(a).join("")!==t?[]:a},t}();t.default=n;var r=16,i=3.5,s=12,o=function(t){return Array.from(new Set(t))};t.keepUnique=o;var a=function(t,e){return t.filter((function(t){return!e.includes(t)}))};t.withoutChars=a;var h=function(t,e){return t.filter((function(t){return e.includes(t)}))};t.onlyChars=h;var l=function(t){return"bigint"==typeof t||!Number.isNaN(Number(t))&&Math.floor(Number(t))===t},u=function(t){return"bigint"==typeof t||t>=0&&Number.isSafeInteger(t)};function f(t,e){if(0===e.length)return t;for(var n,r=t.slice(),i=r.length-1,s=0,o=0;i>0;i--,s++){o+=n=e[s%=e.length].codePointAt(0);var a=(n+s+o)%i,h=r[i],l=r[a];r[a]=h,r[i]=l}return r}var p=function(t,e){var n=[];if("bigint"==typeof t){var r=BigInt(e.length);do{n.unshift(e[Number(t%r)]),t/=r}while(t>BigInt(0))}else do{n.unshift(e[t%e.length]),t=Math.floor(t/e.length)}while(t>0);return n},c=function(t,e){return t.reduce((function(n,r){var i=e.indexOf(r);if(-1===i)throw new Error("The provided ID ("+t.join("")+") is invalid, as it contains characters that do not exist in the alphabet ("+e.join("")+")");if("bigint"==typeof n)return n*BigInt(e.length)+BigInt(i);var s=n*e.length+i;if(Number.isSafeInteger(s))return s;if("function"==typeof BigInt)return BigInt(n)*BigInt(e.length)+BigInt(i);throw new Error("Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment")}),0)},g=/^\+?[0-9]+$/,d=function(t){return g.test(t)?parseInt(t,10):NaN},b=function(t,e,n){return Array.from({length:Math.ceil(t.length/e)},(function(r,i){return n(t.slice(i*e,(i+1)*e))}))},v=function(t){return new RegExp(t.map((function(t){return m(t)})).sort((function(t,e){return e.length-t.length})).join("|"))},y=function(t){return new RegExp("^["+t.map((function(t){return m(t)})).sort((function(t,e){return e.length-t.length})).join("")+"]+$")},m=function(t){return t.replace(/[-[\]{}()*+?.,\\^$|#\s]/g,"\\$&")}}));
 //# sourceMappingURL=hashids.min.js.map
\ No newline at end of file
diff --git a/dist/hashids.min.js.map b/dist/hashids.min.js.map
index bb81c47..0669751 100644
--- a/dist/hashids.min.js.map
+++ b/dist/hashids.min.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/esm/index.js b/esm/index.js
index 154fee3..7b318e6 100644
--- a/esm/index.js
+++ b/esm/index.js
@@ -40,12 +40,9 @@ function () {
       throw new TypeError("Hashids: Provided alphabet has to be a string (is " + typeof alphabet + ")");
     }
 
-    var saltChars = _toConsumableArray(salt);
-
-    var alphabetChars = _toConsumableArray(alphabet);
-
-    var sepsChars = _toConsumableArray(seps);
-
+    var saltChars = Array.from(salt);
+    var alphabetChars = Array.from(alphabet);
+    var sepsChars = Array.from(seps);
     this.salt = saltChars;
     var uniqueAlphabet = keepUnique(alphabetChars);
 
@@ -88,9 +85,9 @@ function () {
       this.alphabet = this.alphabet.slice(guardCount);
     }
 
-    this.guardsRegExp = makeAnyCharRegExp(this.guards);
-    this.sepsRegExp = makeAnyCharRegExp(this.seps);
-    this.allowedCharsRegExp = makeEveryCharRegExp([].concat(_toConsumableArray(this.alphabet), _toConsumableArray(this.guards), _toConsumableArray(this.seps)));
+    this.guardsRegExp = makeAnyOfCharsRegExp(this.guards);
+    this.sepsRegExp = makeAnyOfCharsRegExp(this.seps);
+    this.allowedCharsRegExp = makeAtLeastSomeCharRegExp([].concat(_toConsumableArray(this.alphabet), _toConsumableArray(this.guards), _toConsumableArray(this.seps)));
   }
 
   var _proto = Hashids.prototype;
@@ -187,8 +184,7 @@ function () {
     numbers.forEach(function (number, i) {
       var _ret;
 
-      var buffer = lottery.concat(_this.salt, alphabet); // const buffer = [...lottery, ...this.salt, ...alphabet]
-
+      var buffer = lottery.concat(_this.salt, alphabet);
       alphabet = shuffle(alphabet, buffer);
       var last = toAlphabet(number, alphabet);
 
@@ -234,34 +230,20 @@ function () {
   };
 
   _proto.isValidId = function isValidId(id) {
-    return this.allowedCharsRegExp.test(id); // return this._isValidId([...id])
-  } // private _isValidId(idChars: string[]): boolean {
-  //   return idChars.every(
-  //     (char) =>
-  //       this.alphabet.includes(char) ||
-  //       this.guards.includes(char) ||
-  //       this.seps.includes(char),
-  //   )
-  // }
-  ;
+    return this.allowedCharsRegExp.test(id);
+  };
 
   _proto._decode = function _decode(id) {
     if (!this.isValidId(id)) {
       throw new Error("The provided ID (" + id + ") is invalid, as it contains characters that do not exist in the alphabet (" + this.guards.join('') + this.seps.join('') + this.alphabet.join('') + ")");
     }
 
-    var idGuardsArray = id.split(this.guardsRegExp); // splitAtMatch(idChars, (char) =>
-    //   this.guards.includes(char),
-    // )
-
+    var idGuardsArray = id.split(this.guardsRegExp);
     var splitIndex = idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0;
     var idBreakdown = idGuardsArray[splitIndex];
     if (idBreakdown.length === 0) return [];
     var lotteryChar = idBreakdown[Symbol.iterator]().next().value;
-    var idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp); // const idBreakdownArray = [...idBreakdown]
-    // const [lotteryChar, ...rest] = idBreakdownArray
-    // const idArray = rest.join('').split(this.sepsRegExp)
-
+    var idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp);
     var lastAlphabet = this.alphabet;
     var result = [];
 
@@ -280,15 +262,12 @@ function () {
       var subId = _ref;
       var buffer = [lotteryChar].concat(_toConsumableArray(this.salt), _toConsumableArray(lastAlphabet));
       var nextAlphabet = shuffle(lastAlphabet, buffer.slice(0, lastAlphabet.length));
-      result.push(fromAlphabet(_toConsumableArray(subId), nextAlphabet));
+      result.push(fromAlphabet(Array.from(subId), nextAlphabet));
       lastAlphabet = nextAlphabet;
     } // if the result is different from what we'd expect, we return an empty result (malformed input):
 
 
-    if (this._encode(result).join('') !== id) return []; // if (this._encode(result).some((char, index) => idChars[index] !== char)) {
-    //   return []
-    // }
-
+    if (this._encode(result).join('') !== id) return [];
     return result;
   };
 
@@ -405,7 +384,7 @@ var splitAtIntervalAndMap = function splitAtIntervalAndMap(str, nth, map) {
   });
 };
 
-var makeAnyCharRegExp = function makeAnyCharRegExp(chars) {
+var makeAnyOfCharsRegExp = function makeAnyOfCharsRegExp(chars) {
   return new RegExp(chars.map(function (char) {
     return escapeRegExp(char);
   }) // we need to sort these from longest to shortest,
@@ -415,7 +394,7 @@ var makeAnyCharRegExp = function makeAnyCharRegExp(chars) {
   }).join('|'));
 };
 
-var makeEveryCharRegExp = function makeEveryCharRegExp(chars) {
+var makeAtLeastSomeCharRegExp = function makeAtLeastSomeCharRegExp(chars) {
   return new RegExp("^[" + chars.map(function (char) {
     return escapeRegExp(char);
   }) // we need to sort these from longest to shortest,
diff --git a/esm/index.js.map b/esm/index.js.map
index 95e9df6..f6dfbc0 100644
--- a/esm/index.js.map
+++ b/esm/index.js.map
@@ -1 +1 @@
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NumberLike = number | bigint\n\nexport default class Hashids {\n  private alphabet: string[]\n  private seps: string[]\n  private guards: string[]\n  private salt: string[]\n  private guardsRegExp: RegExp\n  private sepsRegExp: RegExp\n  private allowedCharsRegExp: RegExp\n\n  public constructor(\n    salt = '',\n    private minLength = 0,\n    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890',\n    seps = 'cfhistuCFHISTU',\n  ) {\n    if (typeof minLength !== 'number') {\n      throw new TypeError(\n        `Hashids: Provided 'minLength' has to be a number (is ${typeof minLength})`,\n      )\n    }\n    if (typeof salt !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided 'salt' has to be a string (is ${typeof salt})`,\n      )\n    }\n    if (typeof alphabet !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided alphabet has to be a string (is ${typeof alphabet})`,\n      )\n    }\n\n    const saltChars = [...salt]\n    const alphabetChars = [...alphabet]\n    const sepsChars = [...seps]\n\n    this.salt = saltChars\n\n    const uniqueAlphabet = keepUnique(alphabetChars)\n\n    if (uniqueAlphabet.length < minAlphabetLength) {\n      throw new Error(\n        `Hashids: alphabet must contain at least ${minAlphabetLength} unique characters, provided: ${uniqueAlphabet}`,\n      )\n    }\n\n    /** `alphabet` should not contains `seps` */\n    this.alphabet = withoutChars(uniqueAlphabet, sepsChars)\n    /** `seps` should contain only characters present in `alphabet` */\n    const filteredSeps = onlyChars(sepsChars, uniqueAlphabet)\n    this.seps = shuffle(filteredSeps, saltChars)\n\n    let sepsLength\n    let diff\n\n    if (\n      this.seps.length === 0 ||\n      this.alphabet.length / this.seps.length > sepDiv\n    ) {\n      sepsLength = Math.ceil(this.alphabet.length / sepDiv)\n\n      if (sepsLength > this.seps.length) {\n        diff = sepsLength - this.seps.length\n        this.seps.push(...this.alphabet.slice(0, diff))\n        this.alphabet = this.alphabet.slice(diff)\n      }\n    }\n\n    this.alphabet = shuffle(this.alphabet, saltChars)\n    const guardCount = Math.ceil(this.alphabet.length / guardDiv)\n\n    if (this.alphabet.length < 3) {\n      this.guards = this.seps.slice(0, guardCount)\n      this.seps = this.seps.slice(guardCount)\n    } else {\n      this.guards = this.alphabet.slice(0, guardCount)\n      this.alphabet = this.alphabet.slice(guardCount)\n    }\n\n    this.guardsRegExp = makeAnyCharRegExp(this.guards)\n    this.sepsRegExp = makeAnyCharRegExp(this.seps)\n    this.allowedCharsRegExp = makeEveryCharRegExp([\n      ...this.alphabet,\n      ...this.guards,\n      ...this.seps,\n    ])\n  }\n\n  public encode(numbers: string): string\n  public encode(numbers: NumberLike[]): string\n  public encode(...numbers: NumberLike[]): string\n  public encode(numbers: string[]): string\n  public encode(...numbers: string[]): string\n  public encode<T extends string | NumberLike>(\n    first: T[] | T,\n    ...numbers: T[]\n  ): string {\n    const ret = ''\n\n    if (Array.isArray(first)) {\n      numbers = first\n    } else {\n      // eslint-disable-next-line eqeqeq\n      numbers = [...(first != null ? [first] : []), ...numbers]\n    }\n\n    if (!numbers.length) {\n      return ret\n    }\n\n    if (!numbers.every(isIntegerNumber)) {\n      numbers = numbers.map((n) =>\n        typeof n === 'bigint' || typeof n === 'number'\n          ? n\n          : safeParseInt10(String(n)),\n      ) as T[]\n    }\n\n    if (!(numbers as NumberLike[]).every(isPositiveAndFinite)) {\n      return ret\n    }\n\n    return this._encode(numbers as number[]).join('')\n  }\n\n  public decode(id: string): NumberLike[] {\n    if (!id || typeof id !== 'string' || id.length === 0) return []\n    return this._decode(id)\n  }\n\n  /**\n   * @description Splits a hex string into groups of 12-digit hexadecimal numbers,\n   * then prefixes each with '1' and encodes the resulting array of numbers\n   *\n   * Encoding '00000000000f00000000000f000f' would be the equivalent of:\n   * Hashids.encode([0x100000000000f, 0x100000000000f, 0x1000f])\n   *\n   * This means that if your environment supports BigInts,\n   * you will get different (shorter) results if you provide\n   * a BigInt representation of your hex and use `encode` directly, e.g.:\n   * Hashids.encode(BigInt(`0x${hex}`))\n   *\n   * To decode such a representation back to a hex string, use the following snippet:\n   * Hashids.decode(id)[0].toString(16)\n   */\n  public encodeHex(hex: string | bigint): string {\n    switch (typeof hex) {\n      case 'bigint':\n        hex = hex.toString(16)\n        break\n      case 'string':\n        if (!/^[0-9a-fA-F]+$/.test(hex)) return ''\n        break\n      default:\n        throw new Error(\n          `Hashids: The provided value is neither a string, nor a BigInt (got: ${typeof hex})`,\n        )\n    }\n\n    const numbers = splitAtIntervalAndMap(hex, 12, (part) =>\n      parseInt(`1${part}`, 16),\n    )\n    return this.encode(numbers)\n  }\n\n  public decodeHex(id: string) {\n    return this.decode(id)\n      .map((number) => number.toString(16).slice(1))\n      .join('')\n  }\n\n  private _encode(numbers: NumberLike[]): string[] {\n    let alphabet = this.alphabet\n\n    const numbersIdInt = numbers.reduce<number>(\n      (last, number, i) =>\n        last +\n        (typeof number === 'bigint'\n          ? Number(number % BigInt(i + 100))\n          : number % (i + 100)),\n      0,\n    )\n\n    let ret: string[] = [alphabet[numbersIdInt % alphabet.length]]\n    const lottery = ret.slice()\n\n    const seps = this.seps\n    const guards = this.guards\n\n    numbers.forEach((number, i) => {\n      const buffer = lottery.concat(this.salt, alphabet)\n      // const buffer = [...lottery, ...this.salt, ...alphabet]\n\n      alphabet = shuffle(alphabet, buffer)\n      const last = toAlphabet(number, alphabet)\n\n      ret.push(...last)\n\n      if (i + 1 < numbers.length) {\n        const charCode = last[0].codePointAt(0)! + i\n        const extraNumber =\n          typeof number === 'bigint'\n            ? Number(number % BigInt(charCode))\n            : number % charCode\n        ret.push(seps[extraNumber % seps.length])\n      }\n    })\n\n    if (ret.length < this.minLength) {\n      const prefixGuardIndex =\n        (numbersIdInt + ret[0].codePointAt(0)!) % guards.length\n      ret.unshift(guards[prefixGuardIndex])\n\n      if (ret.length < this.minLength) {\n        const suffixGuardIndex =\n          (numbersIdInt + ret[2].codePointAt(0)!) % guards.length\n        ret.push(guards[suffixGuardIndex])\n      }\n    }\n\n    const halfLength = Math.floor(alphabet.length / 2)\n    while (ret.length < this.minLength) {\n      alphabet = shuffle(alphabet, alphabet)\n      ret.unshift(...alphabet.slice(halfLength))\n      ret.push(...alphabet.slice(0, halfLength))\n\n      const excess = ret.length - this.minLength\n      if (excess > 0) {\n        const halfOfExcess = excess / 2\n        ret = ret.slice(halfOfExcess, halfOfExcess + this.minLength)\n      }\n    }\n\n    return ret\n  }\n\n  public isValidId(id: string): boolean {\n    return this.allowedCharsRegExp.test(id)\n    // return this._isValidId([...id])\n  }\n\n  // private _isValidId(idChars: string[]): boolean {\n  //   return idChars.every(\n  //     (char) =>\n  //       this.alphabet.includes(char) ||\n  //       this.guards.includes(char) ||\n  //       this.seps.includes(char),\n  //   )\n  // }\n\n  private _decode(id: string): NumberLike[] {\n    if (!this.isValidId(id)) {\n      throw new Error(\n        `The provided ID (${id}) is invalid, as it contains characters that do not exist in the alphabet (${this.guards.join(\n          '',\n        )}${this.seps.join('')}${this.alphabet.join('')})`,\n      )\n    }\n    const idGuardsArray = id.split(this.guardsRegExp)\n    // splitAtMatch(idChars, (char) =>\n    //   this.guards.includes(char),\n    // )\n    const splitIndex =\n      idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0\n\n    const idBreakdown = idGuardsArray[splitIndex]\n    if (idBreakdown.length === 0) return []\n\n    const lotteryChar = idBreakdown[Symbol.iterator]().next().value as string\n    const idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp)\n\n    // const idBreakdownArray = [...idBreakdown]\n    // const [lotteryChar, ...rest] = idBreakdownArray\n    // const idArray = rest.join('').split(this.sepsRegExp)\n\n    let lastAlphabet: string[] = this.alphabet\n    const result: NumberLike[] = []\n\n    for (const subId of idArray) {\n      const buffer = [lotteryChar, ...this.salt, ...lastAlphabet]\n      const nextAlphabet = shuffle(\n        lastAlphabet,\n        buffer.slice(0, lastAlphabet.length),\n      )\n      result.push(fromAlphabet([...subId], nextAlphabet))\n      lastAlphabet = nextAlphabet\n    }\n\n    // if the result is different from what we'd expect, we return an empty result (malformed input):\n    if (this._encode(result).join('') !== id) return []\n    // if (this._encode(result).some((char, index) => idChars[index] !== char)) {\n    //   return []\n    // }\n    return result\n  }\n}\n\nconst minAlphabetLength = 16\nconst sepDiv = 3.5\nconst guardDiv = 12\n\nexport const keepUnique = <T>(content: Iterable<T>): T[] =>\n  Array.from(new Set(content))\n\nexport const withoutChars = (\n  chars: string[],\n  withoutChars: string[],\n): string[] => chars.filter((char) => !withoutChars.includes(char))\n\nexport const onlyChars = (chars: string[], keepChars: string[]): string[] =>\n  chars.filter((char) => keepChars.includes(char))\n\nconst isIntegerNumber = (n: NumberLike | string) =>\n  typeof n === 'bigint' ||\n  (!Number.isNaN(Number(n)) && Math.floor(Number(n)) === n)\n\nconst isPositiveAndFinite = (n: NumberLike) =>\n  typeof n === 'bigint' || (n >= 0 && Number.isSafeInteger(n))\n\nfunction shuffle(alphabetChars: string[], saltChars: string[]): string[] {\n  if (saltChars.length === 0) {\n    return alphabetChars\n  }\n\n  let integer: number\n  const transformed = alphabetChars.slice()\n\n  for (let i = transformed.length - 1, v = 0, p = 0; i > 0; i--, v++) {\n    v %= saltChars.length\n    p += integer = saltChars[v].codePointAt(0)!\n    const j = (integer + v + p) % i\n\n    // swap characters at positions i and j\n    const a = transformed[i]\n    const b = transformed[j]\n    transformed[j] = a\n    transformed[i] = b\n  }\n\n  return transformed\n}\n\nconst toAlphabet = (input: NumberLike, alphabetChars: string[]): string[] => {\n  const id: string[] = []\n\n  if (typeof input === 'bigint') {\n    const alphabetLength = BigInt(alphabetChars.length)\n    do {\n      id.unshift(alphabetChars[Number(input % alphabetLength)])\n      input = input / alphabetLength\n    } while (input > BigInt(0))\n  } else {\n    do {\n      id.unshift(alphabetChars[input % alphabetChars.length])\n      input = Math.floor(input / alphabetChars.length)\n    } while (input > 0)\n  }\n\n  return id\n}\n\nconst fromAlphabet = (\n  inputChars: string[],\n  alphabetChars: string[],\n): NumberLike =>\n  inputChars.reduce((carry, item) => {\n    const index = alphabetChars.indexOf(item)\n    if (index === -1) {\n      throw new Error(\n        `The provided ID (${inputChars.join(\n          '',\n        )}) is invalid, as it contains characters that do not exist in the alphabet (${alphabetChars.join(\n          '',\n        )})`,\n      )\n    }\n    if (typeof carry === 'bigint') {\n      return carry * BigInt(alphabetChars.length) + BigInt(index)\n    }\n    const value = carry * alphabetChars.length + index\n    const isSafeValue = Number.isSafeInteger(value)\n    if (isSafeValue) {\n      return value\n    } else {\n      if (typeof BigInt === 'function') {\n        return BigInt(carry) * BigInt(alphabetChars.length) + BigInt(index)\n      } else {\n        // we do not have support for BigInt:\n        throw new Error(\n          `Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment`,\n        )\n      }\n    }\n  }, 0 as NumberLike)\n\nconst safeToParseNumberRegExp = /^\\+?[0-9]+$/\nconst safeParseInt10 = (str: string) =>\n  safeToParseNumberRegExp.test(str) ? parseInt(str, 10) : NaN\n\nconst splitAtIntervalAndMap = <T>(\n  str: string,\n  nth: number,\n  map: (n: string) => T,\n): T[] =>\n  Array.from<never, T>({length: Math.ceil(str.length / nth)}, (_, index) =>\n    map(str.slice(index * nth, (index + 1) * nth)),\n  )\n\nconst makeAnyCharRegExp = (chars: string[]) =>\n  new RegExp(\n    chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('|'),\n  )\n\nconst makeEveryCharRegExp = (chars: string[]) =>\n  new RegExp(\n    `^[${chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('')}]+$`,\n  )\n\nconst escapeRegExp = (text: string) =>\n  text.replace(/[-[\\]{}()*+?.,\\\\^$|#\\s]/g, '\\\\$&')\n"]}
\ No newline at end of file
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NumberLike = number | bigint\n\nexport default class Hashids {\n  private alphabet: string[]\n  private seps: string[]\n  private guards: string[]\n  private salt: string[]\n  private guardsRegExp: RegExp\n  private sepsRegExp: RegExp\n  private allowedCharsRegExp: RegExp\n\n  public constructor(\n    salt = '',\n    private minLength = 0,\n    alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890',\n    seps = 'cfhistuCFHISTU',\n  ) {\n    if (typeof minLength !== 'number') {\n      throw new TypeError(\n        `Hashids: Provided 'minLength' has to be a number (is ${typeof minLength})`,\n      )\n    }\n    if (typeof salt !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided 'salt' has to be a string (is ${typeof salt})`,\n      )\n    }\n    if (typeof alphabet !== 'string') {\n      throw new TypeError(\n        `Hashids: Provided alphabet has to be a string (is ${typeof alphabet})`,\n      )\n    }\n\n    const saltChars = Array.from(salt)\n    const alphabetChars = Array.from(alphabet)\n    const sepsChars = Array.from(seps)\n\n    this.salt = saltChars\n\n    const uniqueAlphabet = keepUnique(alphabetChars)\n\n    if (uniqueAlphabet.length < minAlphabetLength) {\n      throw new Error(\n        `Hashids: alphabet must contain at least ${minAlphabetLength} unique characters, provided: ${uniqueAlphabet}`,\n      )\n    }\n\n    /** `alphabet` should not contains `seps` */\n    this.alphabet = withoutChars(uniqueAlphabet, sepsChars)\n    /** `seps` should contain only characters present in `alphabet` */\n    const filteredSeps = onlyChars(sepsChars, uniqueAlphabet)\n    this.seps = shuffle(filteredSeps, saltChars)\n\n    let sepsLength\n    let diff\n\n    if (\n      this.seps.length === 0 ||\n      this.alphabet.length / this.seps.length > sepDiv\n    ) {\n      sepsLength = Math.ceil(this.alphabet.length / sepDiv)\n\n      if (sepsLength > this.seps.length) {\n        diff = sepsLength - this.seps.length\n        this.seps.push(...this.alphabet.slice(0, diff))\n        this.alphabet = this.alphabet.slice(diff)\n      }\n    }\n\n    this.alphabet = shuffle(this.alphabet, saltChars)\n    const guardCount = Math.ceil(this.alphabet.length / guardDiv)\n\n    if (this.alphabet.length < 3) {\n      this.guards = this.seps.slice(0, guardCount)\n      this.seps = this.seps.slice(guardCount)\n    } else {\n      this.guards = this.alphabet.slice(0, guardCount)\n      this.alphabet = this.alphabet.slice(guardCount)\n    }\n\n    this.guardsRegExp = makeAnyOfCharsRegExp(this.guards)\n    this.sepsRegExp = makeAnyOfCharsRegExp(this.seps)\n    this.allowedCharsRegExp = makeAtLeastSomeCharRegExp([\n      ...this.alphabet,\n      ...this.guards,\n      ...this.seps,\n    ])\n  }\n\n  public encode(numbers: string): string\n  public encode(numbers: NumberLike[]): string\n  public encode(...numbers: NumberLike[]): string\n  public encode(numbers: string[]): string\n  public encode(...numbers: string[]): string\n  public encode<T extends string | NumberLike>(\n    first: T[] | T,\n    ...numbers: T[]\n  ): string {\n    const ret = ''\n\n    if (Array.isArray(first)) {\n      numbers = first\n    } else {\n      // eslint-disable-next-line eqeqeq\n      numbers = [...(first != null ? [first] : []), ...numbers]\n    }\n\n    if (!numbers.length) {\n      return ret\n    }\n\n    if (!numbers.every(isIntegerNumber)) {\n      numbers = numbers.map((n) =>\n        typeof n === 'bigint' || typeof n === 'number'\n          ? n\n          : safeParseInt10(String(n)),\n      ) as T[]\n    }\n\n    if (!(numbers as NumberLike[]).every(isPositiveAndFinite)) {\n      return ret\n    }\n\n    return this._encode(numbers as number[]).join('')\n  }\n\n  public decode(id: string): NumberLike[] {\n    if (!id || typeof id !== 'string' || id.length === 0) return []\n    return this._decode(id)\n  }\n\n  /**\n   * @description Splits a hex string into groups of 12-digit hexadecimal numbers,\n   * then prefixes each with '1' and encodes the resulting array of numbers\n   *\n   * Encoding '00000000000f00000000000f000f' would be the equivalent of:\n   * Hashids.encode([0x100000000000f, 0x100000000000f, 0x1000f])\n   *\n   * This means that if your environment supports BigInts,\n   * you will get different (shorter) results if you provide\n   * a BigInt representation of your hex and use `encode` directly, e.g.:\n   * Hashids.encode(BigInt(`0x${hex}`))\n   *\n   * To decode such a representation back to a hex string, use the following snippet:\n   * Hashids.decode(id)[0].toString(16)\n   */\n  public encodeHex(hex: string | bigint): string {\n    switch (typeof hex) {\n      case 'bigint':\n        hex = hex.toString(16)\n        break\n      case 'string':\n        if (!/^[0-9a-fA-F]+$/.test(hex)) return ''\n        break\n      default:\n        throw new Error(\n          `Hashids: The provided value is neither a string, nor a BigInt (got: ${typeof hex})`,\n        )\n    }\n\n    const numbers = splitAtIntervalAndMap(hex, 12, (part) =>\n      parseInt(`1${part}`, 16),\n    )\n    return this.encode(numbers)\n  }\n\n  public decodeHex(id: string) {\n    return this.decode(id)\n      .map((number) => number.toString(16).slice(1))\n      .join('')\n  }\n\n  private _encode(numbers: NumberLike[]): string[] {\n    let alphabet = this.alphabet\n\n    const numbersIdInt = numbers.reduce<number>(\n      (last, number, i) =>\n        last +\n        (typeof number === 'bigint'\n          ? Number(number % BigInt(i + 100))\n          : number % (i + 100)),\n      0,\n    )\n\n    let ret: string[] = [alphabet[numbersIdInt % alphabet.length]]\n    const lottery = ret.slice()\n\n    const seps = this.seps\n    const guards = this.guards\n\n    numbers.forEach((number, i) => {\n      const buffer = lottery.concat(this.salt, alphabet)\n\n      alphabet = shuffle(alphabet, buffer)\n      const last = toAlphabet(number, alphabet)\n\n      ret.push(...last)\n\n      if (i + 1 < numbers.length) {\n        const charCode = last[0].codePointAt(0)! + i\n        const extraNumber =\n          typeof number === 'bigint'\n            ? Number(number % BigInt(charCode))\n            : number % charCode\n        ret.push(seps[extraNumber % seps.length])\n      }\n    })\n\n    if (ret.length < this.minLength) {\n      const prefixGuardIndex =\n        (numbersIdInt + ret[0].codePointAt(0)!) % guards.length\n      ret.unshift(guards[prefixGuardIndex])\n\n      if (ret.length < this.minLength) {\n        const suffixGuardIndex =\n          (numbersIdInt + ret[2].codePointAt(0)!) % guards.length\n        ret.push(guards[suffixGuardIndex])\n      }\n    }\n\n    const halfLength = Math.floor(alphabet.length / 2)\n    while (ret.length < this.minLength) {\n      alphabet = shuffle(alphabet, alphabet)\n      ret.unshift(...alphabet.slice(halfLength))\n      ret.push(...alphabet.slice(0, halfLength))\n\n      const excess = ret.length - this.minLength\n      if (excess > 0) {\n        const halfOfExcess = excess / 2\n        ret = ret.slice(halfOfExcess, halfOfExcess + this.minLength)\n      }\n    }\n\n    return ret\n  }\n\n  public isValidId(id: string): boolean {\n    return this.allowedCharsRegExp.test(id)\n  }\n\n  private _decode(id: string): NumberLike[] {\n    if (!this.isValidId(id)) {\n      throw new Error(\n        `The provided ID (${id}) is invalid, as it contains characters that do not exist in the alphabet (${this.guards.join(\n          '',\n        )}${this.seps.join('')}${this.alphabet.join('')})`,\n      )\n    }\n    const idGuardsArray = id.split(this.guardsRegExp)\n    const splitIndex =\n      idGuardsArray.length === 3 || idGuardsArray.length === 2 ? 1 : 0\n\n    const idBreakdown = idGuardsArray[splitIndex]\n    if (idBreakdown.length === 0) return []\n\n    const lotteryChar = idBreakdown[Symbol.iterator]().next().value as string\n    const idArray = idBreakdown.slice(lotteryChar.length).split(this.sepsRegExp)\n\n    let lastAlphabet: string[] = this.alphabet\n    const result: NumberLike[] = []\n\n    for (const subId of idArray) {\n      const buffer = [lotteryChar, ...this.salt, ...lastAlphabet]\n      const nextAlphabet = shuffle(\n        lastAlphabet,\n        buffer.slice(0, lastAlphabet.length),\n      )\n      result.push(fromAlphabet(Array.from(subId), nextAlphabet))\n      lastAlphabet = nextAlphabet\n    }\n\n    // if the result is different from what we'd expect, we return an empty result (malformed input):\n    if (this._encode(result).join('') !== id) return []\n    return result\n  }\n}\n\nconst minAlphabetLength = 16\nconst sepDiv = 3.5\nconst guardDiv = 12\n\nexport const keepUnique = <T>(content: Iterable<T>): T[] =>\n  Array.from(new Set(content))\n\nexport const withoutChars = (\n  chars: string[],\n  withoutChars: string[],\n): string[] => chars.filter((char) => !withoutChars.includes(char))\n\nexport const onlyChars = (chars: string[], keepChars: string[]): string[] =>\n  chars.filter((char) => keepChars.includes(char))\n\nconst isIntegerNumber = (n: NumberLike | string) =>\n  typeof n === 'bigint' ||\n  (!Number.isNaN(Number(n)) && Math.floor(Number(n)) === n)\n\nconst isPositiveAndFinite = (n: NumberLike) =>\n  typeof n === 'bigint' || (n >= 0 && Number.isSafeInteger(n))\n\nfunction shuffle(alphabetChars: string[], saltChars: string[]): string[] {\n  if (saltChars.length === 0) {\n    return alphabetChars\n  }\n\n  let integer: number\n  const transformed = alphabetChars.slice()\n\n  for (let i = transformed.length - 1, v = 0, p = 0; i > 0; i--, v++) {\n    v %= saltChars.length\n    p += integer = saltChars[v].codePointAt(0)!\n    const j = (integer + v + p) % i\n\n    // swap characters at positions i and j\n    const a = transformed[i]\n    const b = transformed[j]\n    transformed[j] = a\n    transformed[i] = b\n  }\n\n  return transformed\n}\n\nconst toAlphabet = (input: NumberLike, alphabetChars: string[]): string[] => {\n  const id: string[] = []\n\n  if (typeof input === 'bigint') {\n    const alphabetLength = BigInt(alphabetChars.length)\n    do {\n      id.unshift(alphabetChars[Number(input % alphabetLength)])\n      input = input / alphabetLength\n    } while (input > BigInt(0))\n  } else {\n    do {\n      id.unshift(alphabetChars[input % alphabetChars.length])\n      input = Math.floor(input / alphabetChars.length)\n    } while (input > 0)\n  }\n\n  return id\n}\n\nconst fromAlphabet = (\n  inputChars: string[],\n  alphabetChars: string[],\n): NumberLike =>\n  inputChars.reduce((carry, item) => {\n    const index = alphabetChars.indexOf(item)\n    if (index === -1) {\n      throw new Error(\n        `The provided ID (${inputChars.join(\n          '',\n        )}) is invalid, as it contains characters that do not exist in the alphabet (${alphabetChars.join(\n          '',\n        )})`,\n      )\n    }\n    if (typeof carry === 'bigint') {\n      return carry * BigInt(alphabetChars.length) + BigInt(index)\n    }\n    const value = carry * alphabetChars.length + index\n    const isSafeValue = Number.isSafeInteger(value)\n    if (isSafeValue) {\n      return value\n    } else {\n      if (typeof BigInt === 'function') {\n        return BigInt(carry) * BigInt(alphabetChars.length) + BigInt(index)\n      } else {\n        // we do not have support for BigInt:\n        throw new Error(\n          `Unable to decode the provided string, due to lack of support for BigInt numbers in the current environment`,\n        )\n      }\n    }\n  }, 0 as NumberLike)\n\nconst safeToParseNumberRegExp = /^\\+?[0-9]+$/\nconst safeParseInt10 = (str: string) =>\n  safeToParseNumberRegExp.test(str) ? parseInt(str, 10) : NaN\n\nconst splitAtIntervalAndMap = <T>(\n  str: string,\n  nth: number,\n  map: (n: string) => T,\n): T[] =>\n  Array.from<never, T>({length: Math.ceil(str.length / nth)}, (_, index) =>\n    map(str.slice(index * nth, (index + 1) * nth)),\n  )\n\nconst makeAnyOfCharsRegExp = (chars: string[]) =>\n  new RegExp(\n    chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('|'),\n  )\n\nconst makeAtLeastSomeCharRegExp = (chars: string[]) =>\n  new RegExp(\n    `^[${chars\n      .map((char) => escapeRegExp(char))\n      // we need to sort these from longest to shortest,\n      // as they may contain multibyte unicode characters (these should come first)\n      .sort((a, b) => b.length - a.length)\n      .join('')}]+$`,\n  )\n\nconst escapeRegExp = (text: string) =>\n  text.replace(/[-[\\]{}()*+?.,\\\\^$|#\\s]/g, '\\\\$&')\n"]}
\ No newline at end of file
diff --git a/lib/hashids.ts b/lib/hashids.ts
index 10db305..5a21b10 100644
--- a/lib/hashids.ts
+++ b/lib/hashids.ts
@@ -31,9 +31,9 @@ export default class Hashids {
       )
     }
 
-    const saltChars = [...salt]
-    const alphabetChars = [...alphabet]
-    const sepsChars = [...seps]
+    const saltChars = Array.from(salt)
+    const alphabetChars = Array.from(alphabet)
+    const sepsChars = Array.from(seps)
 
     this.salt = saltChars
 
@@ -265,7 +265,7 @@ export default class Hashids {
         lastAlphabet,
         buffer.slice(0, lastAlphabet.length),
       )
-      result.push(fromAlphabet([...subId], nextAlphabet))
+      result.push(fromAlphabet(Array.from(subId), nextAlphabet))
       lastAlphabet = nextAlphabet
     }
 
diff --git a/package.json b/package.json
index c845c38..1e5be39 100644
--- a/package.json
+++ b/package.json
@@ -27,9 +27,20 @@
   "module": "esm/index.js",
   "browser": "dist/hashids.min",
   "exports": {
-    "import": "./esm/index.js",
-    "require": "./cjs/index.js",
-    "browser": "dist/hashids.min"
+    ".": {
+      "import": "./esm/index.js",
+      "require": "./cjs/index.js",
+      "browser": "./dist/hashids.min.js"
+    },
+    "./cjs": {
+      "require": "./cjs/index.js"
+    },
+    "./cjs/": {
+      "require": "./cjs/"
+    },
+    "./esm/": {
+      "import": "./esm/"
+    }
   },
   "scripts": {
     "lint": "eslint lib/* tests/*",
diff --git a/tests-mjs/requiring.cjs b/tests-mjs/requiring.cjs
new file mode 100644
index 0000000..81dc8ad
--- /dev/null
+++ b/tests-mjs/requiring.cjs
@@ -0,0 +1,18 @@
+const Hashids = require('hashids')
+const Hashids2 = require('hashids/cjs')
+const Hashids3 = require('hashids/cjs/index')
+const Hashids4 = require('hashids/cjs/index.js')
+
+if (Hashids !== Hashids2 || Hashids !== Hashids3 || Hashids !== Hashids4) {
+  throw new Error('Hashids was not loaded properly')
+}
+
+if (typeof Hashids !== 'function') {
+  throw new Error('Hashids is not a function')
+}
+
+const instance = new Hashids('Not Real', 5, 'ABCDEFGHJKMNPQRTWXY234689')
+
+if (!(instance instanceof Hashids)) {
+  throw new Error('new Hashids(...) did not result in an instance of Hashids')
+}
diff --git a/tests-mjs/requiring.test.ts b/tests-mjs/requiring.test.ts
new file mode 100644
index 0000000..7c4848d
--- /dev/null
+++ b/tests-mjs/requiring.test.ts
@@ -0,0 +1,34 @@
+// this will only parse and run if you're using node >= 12 with the --experimental-modules flag
+// alternatively, if you use something like webpack
+// that's why it is in a separate file
+
+import childProcess from 'child_process'
+
+const supportsConditional = /^v\d[3-9]/.test(process.version)
+const describeIfEsm = supportsConditional ? describe : describe.skip
+
+// only run on node >= v13:
+describeIfEsm('conditional requires', () => {
+  test('loads via .cjs', async () => {
+    expect.assertions(1)
+    const p = childProcess.spawn('node', ['./requiring.cjs'], {
+      cwd: __dirname,
+      env: {
+        PATH: process.env.PATH,
+      },
+    })
+
+    p.stderr.on('data', (d) => {
+      if (!d.toString().includes('ExperimentalWarning:')) {
+        // eslint-disable-next-line no-console
+        console.log(d.toString())
+      }
+    })
+
+    const code = await new Promise((resolve) => {
+      p.on('close', (code, _signal) => resolve(code))
+    })
+
+    expect(code).toBe(0)
+  })
+})