diff --git a/dist/AxialMap.js b/dist/AxialMap.js
index 7d66500..ba890a9 100644
--- a/dist/AxialMap.js
+++ b/dist/AxialMap.js
@@ -1,19 +1,17 @@
-'use strict';
+"use strict";
 
-var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
-
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-var AxialMap = function () {
+var AxialMap =
+/*#__PURE__*/
+function () {
   /**
    * @param {Object} opts
    *
    * @return {void}
    */
-  function AxialMap() {
-    var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
-
-    _classCallCheck(this, AxialMap);
+  function AxialMap(opts) {
+    if (opts === void 0) {
+      opts = {};
+    }
 
     this.map = new Map();
     this.maxSize = opts.maxSize || Infinity;
@@ -22,374 +20,353 @@ var AxialMap = function () {
     this.cursor = -1;
   }
 
-  _createClass(AxialMap, [{
-    key: 'keyIsValid',
-    value: function keyIsValid(key) {
-      var isString = typeof key === 'string' || key instanceof String;
-      if (!isString && !Number.isInteger(key)) {
-        throw new Error('Key must be an integer or a string.');
-      }
-    }
+  var _proto = AxialMap.prototype;
 
-    /**
-     * @param  {string|integer} key
-     * @param  {any} object
-     *
-     * @return {void}
-     */
-
-  }, {
-    key: 'add',
-    value: function add(key, object) {
-      this.keyIsValid(key);
-      // Don't push a new element to the keys stack if it's an update.
-      if (this.keys.indexOf(key) === -1) {
-        this.keys.push(key);
-      }
+  _proto.keyIsValid = function keyIsValid(key) {
+    var isString = typeof key === 'string' || key instanceof String;
 
-      this.map.set(key, object);
-      this.size = this.map.size;
-      this.fifo();
+    if (!isString && !Number.isInteger(key)) {
+      throw new Error('Key must be an integer or a string.');
     }
+  }
+  /**
+   * @param  {string|integer} key
+   * @param  {any} object
+   *
+   * @return {void}
+   */
+  ;
 
-    /**
-     * First in first out. Remove the oldest item from the map and the keys array
-     *
-     * @return {void}
-     */
-
-  }, {
-    key: 'fifo',
-    value: function fifo() {
-      if (this.map.size > this.maxSize) {
-        this.remove(this.firstKey());
-      }
-      this.size = this.map.size;
+  _proto.add = function add(key, object) {
+    this.keyIsValid(key); // Don't push a new element to the keys stack if it's an update.
+
+    if (this.keys.indexOf(key) === -1) {
+      this.keys.push(key);
     }
 
-    /**
-     * Returns the first key of the keys array or null.
-     *
-     * @return {string|null}
-     */
+    this.map.set(key, object);
+    this.size = this.map.size;
+    this.fifo();
+  }
+  /**
+   * First in first out. Remove the oldest item from the map and the keys array
+   *
+   * @return {void}
+   */
+  ;
 
-  }, {
-    key: 'firstKey',
-    value: function firstKey() {
-      return this.keys[0] || null;
+  _proto.fifo = function fifo() {
+    if (this.map.size > this.maxSize) {
+      this.remove(this.firstKey());
     }
 
-    /**
-     * Returns the first item in the map.
-     *
-     * @return {any|null}
-     */
+    this.size = this.map.size;
+  }
+  /**
+   * Returns the first key of the keys array or null.
+   *
+   * @return {string|null}
+   */
+  ;
 
-  }, {
-    key: 'first',
-    value: function first() {
-      return this.map.has(this.firstKey()) ? this.map.get(this.firstKey()) : null;
-    }
+  _proto.firstKey = function firstKey() {
+    return this.keys[0] || null;
+  }
+  /**
+   * Returns the first item in the map.
+   *
+   * @return {any|null}
+   */
+  ;
 
-    /**
-     * Return the (n)th key of the keys array.
-     *
-     * @param {integer} n
-     *
-     * @return {string|null}
-     */
-
-  }, {
-    key: 'nthKey',
-    value: function nthKey(n) {
-      return this.keys[n - 1] || null;
-    }
+  _proto.first = function first() {
+    return this.map.has(this.firstKey()) ? this.map.get(this.firstKey()) : null;
+  }
+  /**
+   * Return the (n)th key of the keys array.
+   *
+   * @param {integer} n
+   *
+   * @return {string|null}
+   */
+  ;
 
-    /**
-     * Returns the (n)th item of the map or null.
-     *
-     * @param {*} n
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'nth',
-    value: function nth(n) {
-      return this.map.has(this.nthKey(n)) ? this.map.get(this.nthKey(n)) : null;
-    }
+  _proto.nthKey = function nthKey(n) {
+    return this.keys[n - 1] || null;
+  }
+  /**
+   * Returns the (n)th item of the map or null.
+   *
+   * @param {*} n
+   *
+   * @return {any|null}
+   */
+  ;
 
-    /**
-     * Returns the last key of the keys array
-     *
-     * @return {string|null}
-     */
+  _proto.nth = function nth(n) {
+    return this.map.has(this.nthKey(n)) ? this.map.get(this.nthKey(n)) : null;
+  }
+  /**
+   * Returns the last key of the keys array
+   *
+   * @return {string|null}
+   */
+  ;
 
-  }, {
-    key: 'lastKey',
-    value: function lastKey() {
-      return this.keys[this.keys.length - 1] || null;
-    }
+  _proto.lastKey = function lastKey() {
+    return this.keys[this.keys.length - 1] || null;
+  }
+  /**
+   * Returns the last item of the map or null.
+   *
+   * @param {*} n
+   *
+   * @return {any|null}
+   */
+  ;
 
-    /**
-     * Returns the last item of the map or null.
-     *
-     * @param {*} n
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'last',
-    value: function last() {
-      return this.map.has(this.lastKey()) ? this.map.get(this.lastKey()) : null;
-    }
+  _proto.last = function last() {
+    return this.map.has(this.lastKey()) ? this.map.get(this.lastKey()) : null;
+  }
+  /**
+   * Get an item from the map given its key.
+   *
+   * @param {string} key
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.get = function get(key) {
+    return this.map.has(key) ? this.map.get(key) : null;
+  }
+  /**
+   * Set the cursor to the position of `key` in the keys array.
+   *
+   * @param {string} key
+   *
+   * @return {void}
+   */
+  ;
 
-    /**
-     * Get an item from the map given its key.
-     *
-     * @param {string} key
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'get',
-    value: function get(key) {
-      return this.map.has(key) ? this.map.get(key) : null;
+  _proto.setCursor = function setCursor(key) {
+    var index = this.keys.indexOf(key);
+    this.cursor = index !== -1 ? index : -1;
+  }
+  /**
+   * Returns the item of the map that corresponds to the current cursor location.
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.current = function current() {
+    var key = this.keys[this.cursor];
+    return key !== undefined ? this.get(key) : null;
+  }
+  /**
+   * Advances the cursor from its current position and returns the item of the map
+   * that corresponds with the new cursor position. If the cursor would advance out
+   * of bounds, then the current position (the last position) is maintained and
+   * that item is returned.
+   *
+   * `null` is returned if the map is empty.
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.nextOrLast = function nextOrLast() {
+    this.cursor = this.cursor < this.keys.length - 1 ? this.cursor + 1 : this.cursor;
+    return this.current();
+  }
+  /**
+   * Advances the cursor and returns the next item. If the "next" item is out of
+   * bounds `null` is returned.
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.next = function next() {
+    if (!this.keys[this.cursor + 1]) {
+      return null;
     }
 
-    /**
-     * Set the cursor to the position of `key` in the keys array.
-     *
-     * @param {string} key
-     *
-     * @return {void}
-     */
-
-  }, {
-    key: 'setCursor',
-    value: function setCursor(key) {
-      var index = this.keys.indexOf(key);
-      this.cursor = index !== -1 ? index : -1;
+    this.cursor += 1;
+    return this.current();
+  }
+  /**
+   * Rolls back the cursor 1 position from its current position and returns the
+   * item of the map that corresponds with the new cursor position. If the cursor
+   * would roll back out of bounds, then the current position (the first position)
+   * is maintained and that item is returned.
+   *
+   * `null` is returned if the map is empty.
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.previousOrFirst = function previousOrFirst() {
+    this.cursor = this.cursor > 0 ? this.cursor - 1 : this.cursor;
+    return this.current();
+  }
+  /**
+   * Rolls back the cursor 1 position and returns the next item. If the "previous"
+   * item is out of bounds `null` is returned.
+   *
+   * @return {any|null}
+   */
+  ;
+
+  _proto.previous = function previous() {
+    if (!this.keys[this.cursor - 1]) {
+      return null;
     }
 
-    /**
-     * Returns the item of the map that corresponds to the current cursor location.
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'current',
-    value: function current() {
-      var key = this.keys[this.cursor];
-      return key !== undefined ? this.get(key) : null;
+    this.cursor -= 1;
+    return this.current();
+  }
+  /**
+   * Copies a selection of the map and returns a multidimensional array containing
+   * keys and items from `start` to `end` exclusive.
+   *
+   * @param {integer} start
+   * @param {integer} end
+   *
+   * @return {Array}
+   */
+  ;
+
+  _proto.slice = function slice(start, end) {
+    if (end === void 0) {
+      end = Infinity;
     }
 
-    /**
-     * Advances the cursor from its current position and returns the item of the map
-     * that corresponds with the new cursor position. If the cursor would advance out
-     * of bounds, then the current position (the last position) is maintained and
-     * that item is returned.
-     *
-     * `null` is returned if the map is empty.
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'nextOrLast',
-    value: function nextOrLast() {
-      this.cursor = this.cursor < this.keys.length - 1 ? this.cursor + 1 : this.cursor;
-      return this.current();
+    var key = this.keys[start];
+
+    if (!key) {
+      return [];
     }
 
-    /**
-     * Advances the cursor and returns the next item. If the "next" item is out of
-     * bounds `null` is returned.
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'next',
-    value: function next() {
-      if (!this.keys[this.cursor + 1]) {
-        return null;
+    this.setCursor(key);
+    var output = [[key, this.current()]];
+
+    for (var i = this.cursor + 1; i < end; i += 1) {
+      var nextItem = this.next();
+
+      if (!nextItem) {
+        break;
       }
-      this.cursor += 1;
-      return this.current();
+
+      output.push([this.keys[this.cursor], nextItem]);
     }
 
-    /**
-     * Rolls back the cursor 1 position from its current position and returns the
-     * item of the map that corresponds with the new cursor position. If the cursor
-     * would roll back out of bounds, then the current position (the first position)
-     * is maintained and that item is returned.
-     *
-     * `null` is returned if the map is empty.
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'previousOrFirst',
-    value: function previousOrFirst() {
-      this.cursor = this.cursor > 0 ? this.cursor - 1 : this.cursor;
-      return this.current();
+    return output;
+  }
+  /**
+   * Removes a group of items from `start` to `end` exclusive. The removed items
+   * are returned as a multidimensional array containing keys and items.
+   *
+   * @param {integer} start
+   * @param {integer} deleteCount
+   */
+  ;
+
+  _proto.splice = function splice(start, deleteCount) {
+    if (deleteCount === void 0) {
+      deleteCount = Infinity;
     }
 
-    /**
-     * Rolls back the cursor 1 position and returns the next item. If the "previous"
-     * item is out of bounds `null` is returned.
-     *
-     * @return {any|null}
-     */
-
-  }, {
-    key: 'previous',
-    value: function previous() {
-      if (!this.keys[this.cursor - 1]) {
-        return null;
-      }
-      this.cursor -= 1;
-      return this.current();
+    var key = this.keys[start];
+
+    if (!key) {
+      return [];
     }
 
-    /**
-     * Copies a selection of the map and returns a multidimensional array containing
-     * keys and items from `start` to `end` exclusive.
-     *
-     * @param {integer} start
-     * @param {integer} end
-     *
-     * @return {Array}
-     */
-
-  }, {
-    key: 'slice',
-    value: function slice(start) {
-      var end = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Infinity;
-
-      var key = this.keys[start];
-      if (!key) {
-        return [];
-      }
+    this.setCursor(key);
+    var output = [this.remove(key)];
 
-      this.setCursor(key);
-      var output = [[key, this.current()]];
-      for (var i = this.cursor + 1; i < end; i += 1) {
-        var nextItem = this.next();
-        if (!nextItem) {
-          break;
-        }
-        output.push([this.keys[this.cursor], nextItem]);
+    for (var i = this.cursor; i < deleteCount; i += 1) {
+      var nextItem = this.next();
+
+      if (!nextItem) {
+        break;
       }
 
-      return output;
+      output.push(this.remove(this.keys[this.cursor]));
     }
 
-    /**
-     * Removes a group of items from `start` to `end` exclusive. The removed items
-     * are returned as a multidimensional array containing keys and items.
-     *
-     * @param {integer} start
-     * @param {integer} deleteCount
-     */
-
-  }, {
-    key: 'splice',
-    value: function splice(start) {
-      var deleteCount = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Infinity;
-
-      var key = this.keys[start];
-      if (!key) {
-        return [];
-      }
+    return output;
+  }
+  /**
+   * Removes and returns an element from the map given its key.
+   *
+   * @param {string|integer} key
+   *
+   * @return {Array|null}
+   */
+  ;
 
-      this.setCursor(key);
-      var output = [this.remove(key)];
-      for (var i = this.cursor; i < deleteCount; i += 1) {
-        var nextItem = this.next();
-        if (!nextItem) {
-          break;
-        }
-        output.push(this.remove(this.keys[this.cursor]));
-      }
+  _proto.remove = function remove(key) {
+    if (this.map.has(key)) {
+      var element = this.map.get(key);
+      this.map["delete"](key);
+      var index = this.keys.indexOf(key);
+
+      if (index > -1) {
+        this.keys.splice(index, 1);
+        this.size = this.map.size;
+      } // check the cursor
 
-      return output;
-    }
 
-    /**
-     * Removes and returns an element from the map given its key.
-     *
-     * @param {string|integer} key
-     *
-     * @return {Array|null}
-     */
-
-  }, {
-    key: 'remove',
-    value: function remove(key) {
-      if (this.map.has(key)) {
-        var element = this.map.get(key);
-        this.map.delete(key);
-        var index = this.keys.indexOf(key);
-        if (index > -1) {
-          this.keys.splice(index, 1);
-          this.size = this.map.size;
-        }
-        // check the cursor
-        if (this.keys[this.cursor] && this.cursor > -1) {
-          this.cursor -= 1;
-        }
-
-        return [key, element];
+      if (this.keys[this.cursor] && this.cursor > -1) {
+        this.cursor -= 1;
       }
-      return null;
+
+      return [key, element];
     }
 
-    /**
-     * Will iterate over each item in the map invoking the provided callback. The
-     * callback is provided three arguments. The element itself, the key, and the
-     * iteration number (index).
-     *
-     * @param {function} callback
-     *
-     * @return {void}
-     */
-
-  }, {
-    key: 'each',
-    value: function each(callback) {
-      if (typeof callback !== 'function') {
-        throw new Error('A callback function must be supplied as the only parameter.');
-      }
+    return null;
+  }
+  /**
+   * Will iterate over each item in the map invoking the provided callback. The
+   * callback is provided three arguments. The element itself, the key, and the
+   * iteration number (index).
+   *
+   * @param {function} callback
+   *
+   * @return {void}
+   */
+  ;
 
-      var iterator = this.map.entries();
-      var keyPair = iterator.next();
-      var index = 0;
-      while (!keyPair.done) {
-        callback(keyPair.value[1], keyPair.value[0], index);
-        index += 1;
-        keyPair = iterator.next();
-      }
+  _proto.each = function each(callback) {
+    if (typeof callback !== 'function') {
+      throw new Error('A callback function must be supplied as the only parameter.');
     }
 
-    /**
-     * Reset the AxialMap to it's initial state. The `maxSize` property is maintained.
-     */
-
-  }, {
-    key: 'reset',
-    value: function reset() {
-      this.map = new Map();
-      this.size = 0;
-      this.keys = [];
-      this.cursor = -1;
+    var iterator = this.map.entries();
+    var keyPair = iterator.next();
+    var index = 0;
+
+    while (!keyPair.done) {
+      callback(keyPair.value[1], keyPair.value[0], index);
+      index += 1;
+      keyPair = iterator.next();
     }
-  }]);
+  }
+  /**
+   * Reset the AxialMap to it's initial state. The `maxSize` property is maintained.
+   */
+  ;
+
+  _proto.reset = function reset() {
+    this.map = new Map();
+    this.size = 0;
+    this.keys = [];
+    this.cursor = -1;
+  };
 
   return AxialMap;
 }();
diff --git a/package-lock.json b/package-lock.json
index bc551e2..f6c87e5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,92 +4,138 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/cli": {
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/cli/-/cli-7.6.0.tgz",
+      "integrity": "sha512-1CTDyGUjQqW3Mz4gfKZ04KGOckyyaNmKneAMlABPS+ZyuxWv3FrVEVz7Ag08kNIztVx8VaJ8YgvYLSNlMKAT5Q==",
+      "dev": true,
+      "requires": {
+        "chokidar": "^2.1.8",
+        "commander": "^2.8.1",
+        "convert-source-map": "^1.1.0",
+        "fs-readdir-recursive": "^1.1.0",
+        "glob": "^7.0.0",
+        "lodash": "^4.17.13",
+        "mkdirp": "^0.5.1",
+        "output-file-sync": "^2.0.0",
+        "slash": "^2.0.0",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "output-file-sync": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/output-file-sync/-/output-file-sync-2.0.1.tgz",
+          "integrity": "sha512-mDho4qm7WgIXIGf4eYU1RHN2UU5tPfVYVSRwDJw0uTmj35DQUt/eNp19N7v6T3SrR0ESTEf2up2CGO73qI35zQ==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.11",
+            "is-plain-obj": "^1.1.0",
+            "mkdirp": "^0.5.1"
+          }
+        },
+        "slash": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
+          "integrity": "sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A==",
+          "dev": true
+        }
+      }
+    },
     "@babel/code-frame": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
       "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
-      "dev": true,
       "requires": {
         "@babel/highlight": "^7.0.0"
       }
     },
     "@babel/core": {
-      "version": "7.2.2",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.2.2.tgz",
-      "integrity": "sha512-59vB0RWt09cAct5EIe58+NzGP4TFSD3Bz//2/ELy3ZeTeKF6VTD1AXlH8BGGbCX0PuobZBsIzO7IAI9PH67eKw==",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.2.2",
-        "@babel/helpers": "^7.2.0",
-        "@babel/parser": "^7.2.2",
-        "@babel/template": "^7.2.2",
-        "@babel/traverse": "^7.2.2",
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@@ -4036,17 +4198,20 @@
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@@ -4113,7 +4278,7 @@
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@@ -4270,13 +4441,13 @@
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@@ -4351,12 +4524,12 @@
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@@ -4386,18 +4559,19 @@
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+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "dev": true
     },
     "validate-npm-package-license": {
       "version": "3.0.4",
diff --git a/package.json b/package.json
index ffa7a40..b2db5ce 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "A wrapper for a JS native Map object to make traversing them a bit easier.",
   "main": "./dist/AxialMap.js",
   "scripts": {
-    "build": "babel src -d dist --presets babel-preset-es2015",
+    "build": "babel src -d dist",
     "prepublish": "npm run test && npm run build",
     "test": "mocha **/*.test.js",
     "test:watch": "nodemon --exec \"npm test\"",
@@ -32,7 +32,7 @@
   },
   "homepage": "https://github.com/sarcastron/axial-map#readme",
   "devDependencies": {
-    "babel-cli": "^6.26.0",
+    "@babel/cli": "^7.6.0",
     "babel-preset-es2015": "^6.24.1",
     "chai": "^4.2.0",
     "documentation": "^9.1.1",
@@ -40,6 +40,23 @@
     "eslint-plugin-chai-friendly": "^0.4.1",
     "mocha": "^5.2.0",
     "nodemon": "^1.18.9",
-    "nyc": "^13.1.0"
+    "nyc": "^14.1.1"
+  },
+  "dependencies": {
+    "@babel/core": "^7.6.0",
+    "@babel/preset-env": "^7.6.0"
+  },
+  "browserslist": [
+    "defaults"
+  ],
+  "babel": {
+    "presets": [
+      [
+        "@babel/env",
+        {
+          "loose": true
+        }
+      ]
+    ]
   }
 }
diff --git a/tests/axial-map.test.js b/tests/axial-map.test.js
index 280364c..3b2f534 100644
--- a/tests/axial-map.test.js
+++ b/tests/axial-map.test.js
@@ -427,4 +427,4 @@ describe('Axial Map', () => {
       assert.deepEqual(testMap.keys, []);
     });
   });
-});
\ No newline at end of file
+});