pkg: update lint and fix rbt performance for v14 and v16.

rbt: remove public class fields (minor) as node v14 and v16 struggle
with performance when they are declared. (almost 5x)

.eslintrc.json

@@ -1,19 +1,9 @@
 {
   "env": {
-    "es6": true,
+    "es2022": true,
     "node": true
   },
   "extends": "eslint:recommended",
-  "globals": {
-    "Atomics": "readable",
-    "BigInt": "readable",
-    "BigInt64Array": "readable",
-    "BigUint64Array": "readable",
-    "queueMicrotask": "readable",
-    "SharedArrayBuffer": "readable",
-    "TextEncoder": "readable",
-    "TextDecoder": "readable"
-  },
   "overrides": [
     {
       "files": ["*.mjs"],
@@ -39,13 +29,13 @@
       },
       "rules": {
         "max-len": "off",
-        "prefer-arrow-callback": "off"
+        "prefer-arrow-callback": "off",
+        "no-return-assign": "off"
       }
     }
   ],
-  "parser": "babel-eslint",
   "parserOptions": {
-    "ecmaVersion": 10,
+    "ecmaVersion": 13,
     "ecmaFeatures": {
       "globalReturn": true
     },

lib/key.js

@@ -343,6 +343,7 @@ class BaseKey {
 
       assert(typeof name === 'string');
 
+      // eslint-disable-next-line no-prototype-builtins
       if (!types.hasOwnProperty(name))
         throw new Error(`Invalid type name: ${name}.`);
 

lib/rbt.js

@@ -759,24 +759,6 @@ class RBTIterator {
  */
 
 class RBTNode {
-  /** @type {Buffer} */
-  key;
-
-  /** @type {Buffer} */
-  value;
-
-  /** @type {Number} */
-  color;
-
-  /** @type {RBTNode|RBTSentinel} */
-  parent;
-
-  /** @type {RBTNode|RBTSentinel} */
-  left;
-
-  /** @type {RBTNode|RBTSentinel} */
-  right;
-
   /**
    * Create an RBT node.
    * @constructor
@@ -849,24 +831,6 @@ class RBTNode {
  */
 
 class RBTSentinel {
-  /** @type {null} */
-  key;
-
-  /** @type {null} */
-  value;
-
-  /** @type {Number} */
-  color;
-
-  /** @type {null} */
-  parent;
-
-  /** @type {null} */
-  left;
-
-  /** @type {null} */
-  right;
-
   /**
    * Create an RBT Sentinel Node.
    * @constructor