diff --git a/package.json b/package.json
index 41e8e4f..2d15880 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "lint:test": "eslint --fix 'test/**/*.{js,ts}'",
     "lint": "npm run lint:src && npm run lint:test",
     "format:src": "prettier --write 'src/**/*.{js,ts}'",
+    "format:specific": "prettier --write 'src/data-structures/binary-tree/bst.ts'",
     "format:test": "prettier --write 'test/**/*.{js,ts}'",
     "format": "npm run format:src && npm run format:test",
     "fix:src": "npm run lint:src && npm run format:src",
diff --git a/src/data-structures/binary-tree/avl-tree.ts b/src/data-structures/binary-tree/avl-tree.ts
index e1c7bc7..e232497 100644
--- a/src/data-structures/binary-tree/avl-tree.ts
+++ b/src/data-structures/binary-tree/avl-tree.ts
@@ -10,8 +10,8 @@ import type {AVLTreeNodeNested, AVLTreeOptions, BinaryTreeDeletedResult, BinaryT
 import {MapCallback} from '../../types';
 import {IBinaryTree} from '../../interfaces';
 
-export class AVLTreeNode<V = any, FAMILY extends AVLTreeNode<V, FAMILY> = AVLTreeNodeNested<V>> extends
-  BSTNode<V, FAMILY> {
+export class AVLTreeNode<V = any, N extends AVLTreeNode<V, N> = AVLTreeNodeNested<V>> extends
+  BSTNode<V, N> {
   height: number;
 
   constructor(key: BinaryTreeNodeKey, val?: V) {
@@ -20,7 +20,7 @@ export class AVLTreeNode<V = any, FAMILY extends AVLTreeNode<V, FAMILY> = AVLTre
   }
 }
 
-export class AVLTree<N extends AVLTreeNode<N['val'], N> = AVLTreeNode> extends BST<N> implements IBinaryTree<N> {
+export class AVLTree<V = any, N extends AVLTreeNode<V, N> = AVLTreeNode> extends BST<V, N>  implements IBinaryTree<V, N>{
   /**
    * This is a constructor function for an AVL tree data structure in TypeScript.
    * @param {AVLTreeOptions} [options] - The `options` parameter is an optional object that can be passed to the
@@ -36,12 +36,12 @@ export class AVLTree<N extends AVLTreeNode<N['val'], N> = AVLTreeNode> extends B
    * @param {BinaryTreeNodeKey} key - The key parameter is the key value that will be associated with
    * the new node. It is used to determine the position of the node in the binary search tree.
    * @param [val] - The parameter `val` is an optional value that can be assigned to the node. It is of
-   * type `N['val']`, which means it can be any value that is assignable to the `val` property of the
+   * type `V`, which means it can be any value that is assignable to the `val` property of the
    * node type `N`.
    * @returns a new AVLTreeNode object with the specified key and value.
    */
-  override createNode(key: BinaryTreeNodeKey, val?: N['val']): N {
-    return new AVLTreeNode<N['val'], N>(key, val) as N;
+  override createNode(key: BinaryTreeNodeKey, val?: V): N {
+    return new AVLTreeNode<V, N>(key, val) as N;
   }
 
   /**
@@ -53,7 +53,7 @@ export class AVLTree<N extends AVLTreeNode<N['val'], N> = AVLTreeNode> extends B
    * are adding to the binary search tree.
    * @returns The method is returning the inserted node (`N`), `null`, or `undefined`.
    */
-  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined {
+  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: V): N | null | undefined {
     // TODO support node as a param
     const inserted = super.add(keyOrNode, val);
     if (inserted) this._balancePath(inserted);
diff --git a/src/data-structures/binary-tree/binary-tree.ts b/src/data-structures/binary-tree/binary-tree.ts
index b18e848..5a30edf 100644
--- a/src/data-structures/binary-tree/binary-tree.ts
+++ b/src/data-structures/binary-tree/binary-tree.ts
@@ -23,9 +23,9 @@ import {Queue} from '../queue';
 /**
  * Represents a node in a binary tree.
  * @template V - The type of data stored in the node.
- * @template FAMILY - The type of the family relationship in the binary tree.
+ * @template N - The type of the family relationship in the binary tree.
  */
-export class BinaryTreeNode<V = any, FAMILY extends BinaryTreeNode<V, FAMILY> = BinaryTreeNodeNested<V>> {
+export class BinaryTreeNode<V = any, N extends BinaryTreeNode<V, N> = BinaryTreeNode<V, BinaryTreeNodeNested<V>>> {
   /**
    * The key associated with the node.
    */
@@ -39,7 +39,7 @@ export class BinaryTreeNode<V = any, FAMILY extends BinaryTreeNode<V, FAMILY> =
   /**
    * The parent node of the current node.
    */
-  parent: FAMILY | null | undefined;
+  parent: N | null | undefined;
 
   /**
    * Creates a new instance of BinaryTreeNode.
@@ -51,42 +51,42 @@ export class BinaryTreeNode<V = any, FAMILY extends BinaryTreeNode<V, FAMILY> =
     this.val = val;
   }
 
-  private _left: FAMILY | null | undefined;
+  private _left: N | null | undefined;
 
   /**
    * Get the left child node.
    */
-  get left(): FAMILY | null | undefined {
+  get left(): N | null | undefined {
     return this._left;
   }
 
   /**
    * Set the left child node.
-   * @param {FAMILY | null | undefined} v - The left child node.
+   * @param {N | null | undefined} v - The left child node.
    */
-  set left(v: FAMILY | null | undefined) {
+  set left(v: N | null | undefined) {
     if (v) {
-      v.parent = this as unknown as FAMILY;
+      v.parent = this as unknown as N;
     }
     this._left = v;
   }
 
-  private _right: FAMILY | null | undefined;
+  private _right: N | null | undefined;
 
   /**
    * Get the right child node.
    */
-  get right(): FAMILY | null | undefined {
+  get right(): N | null | undefined {
     return this._right;
   }
 
   /**
    * Set the right child node.
-   * @param {FAMILY | null | undefined} v - The right child node.
+   * @param {N | null | undefined} v - The right child node.
    */
-  set right(v: FAMILY | null | undefined) {
+  set right(v: N | null | undefined) {
     if (v) {
-      v.parent = this as unknown as FAMILY;
+      v.parent = this as unknown as N;
     }
     this._right = v;
   }
@@ -96,7 +96,7 @@ export class BinaryTreeNode<V = any, FAMILY extends BinaryTreeNode<V, FAMILY> =
    * @returns {FamilyPosition} - The family position of the node.
    */
   get familyPosition(): FamilyPosition {
-    const that = this as unknown as FAMILY;
+    const that = this as unknown as N;
     if (!this.parent) {
       return this.left || this.right ? FamilyPosition.ROOT : FamilyPosition.ISOLATED;
     }
@@ -115,7 +115,7 @@ export class BinaryTreeNode<V = any, FAMILY extends BinaryTreeNode<V, FAMILY> =
  * Represents a binary tree data structure.
  * @template N - The type of the binary tree's nodes.
  */
-export class BinaryTree<N extends BinaryTreeNode<N['val'], N> = BinaryTreeNode> implements IBinaryTree<N> {
+export class BinaryTree<V = any, N extends BinaryTreeNode<V, N> = BinaryTreeNode> implements IBinaryTree<V, N>{
   /**
    * Creates a new instance of BinaryTree.
    * @param {BinaryTreeOptions} [options] - The options for the binary tree.
@@ -165,11 +165,11 @@ export class BinaryTree<N extends BinaryTreeNode<N['val'], N> = BinaryTreeNode>
   /**
    * Creates a new instance of BinaryTreeNode with the given key and value.
    * @param {BinaryTreeNodeKey} key - The key for the new node.
-   * @param {N['val']} val - The value for the new node.
+   * @param {V} val - The value for the new node.
    * @returns {N} - The newly created BinaryTreeNode.
    */
-  createNode(key: BinaryTreeNodeKey, val?: N['val']): N {
-    return new BinaryTreeNode<N['val'], N>(key, val) as N;
+  createNode(key: BinaryTreeNodeKey, val?: V): N {
+    return new BinaryTreeNode<V, N>(key, val) as N;
   }
 
   /**
@@ -191,10 +191,10 @@ export class BinaryTree<N extends BinaryTreeNode<N['val'], N> = BinaryTreeNode>
   /**
    * Add a node with the given key and value to the binary tree.
    * @param {BinaryTreeNodeKey | N | null} keyOrNode - The key or node to add to the binary tree.
-   * @param {N['val']} val - The value for the new node (optional).
+   * @param {V} val - The value for the new node (optional).
    * @returns {N | null | undefined} - The inserted node, or null if nothing was inserted, or undefined if the operation failed.
    */
-  add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined {
+  add(keyOrNode: BinaryTreeNodeKey | N | null, val?: V): N | null | undefined {
     const _bfs = (root: N, newNode: N | null): N | undefined | null => {
       const queue = new Queue<N | null>([root]);
       while (queue.size > 0) {
@@ -249,12 +249,12 @@ export class BinaryTree<N extends BinaryTreeNode<N['val'], N> = BinaryTreeNode>
    * values, and adds them to the binary tree.
    * @param {(BinaryTreeNodeKey | null)[] | (N | null)[]} keysOrNodes - An array of BinaryTreeNodeKey or BinaryTreeNode
    * objects, or null values.
-   * @param {N['val'][]} [values] - The `values` parameter is an optional array of values (`N['val'][]`) that corresponds to
+   * @param {V[]} [values] - The `values` parameter is an optional array of values (`V[]`) that corresponds to
    * the nodes or node IDs being added. It is used to set the value of each node being added. If `values` is not provided,
    * the value of the nodes will be `undefined`.
    * @returns The function `addMany` returns an array of `N`, `null`, or `undefined` values.
    */
-  addMany(keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[], values?: N['val'][]): (N | null | undefined)[] {
+  addMany(keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[], values?: V[]): (N | null | undefined)[] {
     // TODO not sure addMany not be run multi times
     return keysOrNodes.map((keyOrNode, i) => {
       if (keyOrNode instanceof BinaryTreeNode) {
@@ -274,12 +274,12 @@ export class BinaryTree<N extends BinaryTreeNode<N['val'], N> = BinaryTreeNode>
    * The `refill` function clears the binary tree and adds multiple nodes with the given IDs or nodes and optional data.
    * @param {(BinaryTreeNodeKey | N)[]} keysOrNodes - The `keysOrNodes` parameter is an array that can contain either
    * `BinaryTreeNodeKey` or `N` values.
-   * @param {N[] | Array<N['val']>} [data] - The `data` parameter is an optional array of values that will be assigned to
+   * @param {N[] | Array<V>} [data] - The `data` parameter is an optional array of values that will be assigned to
    * the nodes being added. If provided, the length of the `data` array should be equal to the length of the `keysOrNodes`
    * array. Each value in the `data` array will be assigned to the
    * @returns The method is returning a boolean value.
    */
-  refill(keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[], data?: N[] | Array<N['val']>): boolean {
+  refill(keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[], data?: Array<V>): boolean {
     this.clear();
     return keysOrNodes.length === this.addMany(keysOrNodes, data).length;
   }
diff --git a/src/data-structures/binary-tree/bst.ts b/src/data-structures/binary-tree/bst.ts
index 1e632aa..9c2a22d 100644
--- a/src/data-structures/binary-tree/bst.ts
+++ b/src/data-structures/binary-tree/bst.ts
@@ -18,13 +18,13 @@ import {BinaryTree, BinaryTreeNode} from './binary-tree';
 import {IBinaryTree} from '../../interfaces';
 import {Queue} from '../queue';
 
-export class BSTNode<V = any, FAMILY extends BSTNode<V, FAMILY> = BSTNodeNested<V>> extends BinaryTreeNode<V, FAMILY> {
+export class BSTNode<V = any, N extends BSTNode<V, N> = BSTNodeNested<V>> extends BinaryTreeNode<V, N> {
   constructor(key: BinaryTreeNodeKey, val?: V) {
     super(key, val);
   }
 }
 
-export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N> implements IBinaryTree<N> {
+export class BST<V = any, N extends BSTNode<V, N> = BSTNode> extends BinaryTree<V, N> implements IBinaryTree<V, N> {
   /**
    * The constructor function initializes a binary search tree object with an optional comparator
    * function.
@@ -49,8 +49,8 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
    * represents the value associated with the node in a binary search tree.
    * @returns a new instance of the BSTNode class with the specified key and value.
    */
-  override createNode(key: BinaryTreeNodeKey, val?: N['val']): N {
-    return new BSTNode<N['val'], N>(key, val) as N;
+  override createNode(key: BinaryTreeNodeKey, val?: V): N {
+    return new BSTNode<V, N>(key, val) as N;
   }
 
   /**
@@ -63,7 +63,7 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
    * @returns the inserted node (N) if it was successfully added to the binary search tree. If the node
    * was not added or if the parameters were invalid, it returns null or undefined.
    */
-  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined {
+  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: V): N | null | undefined {
     // TODO support node as a parameter
     let inserted: N | null = null;
     let newNode: N | null = null;
@@ -136,7 +136,7 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
    * represents an array of keys or nodes that need to be added to the binary search tree. It can be an
    * array of `BinaryTreeNodeKey` or `N` (which represents the node type in the binary search tree) or
    * `null
-   * @param {N['val'][]} data - The values of tree nodes
+   * @param {V[]} data - The values of tree nodes
    * @param {boolean} isBalanceAdd - If true the nodes will be balance inserted in binary search method.
    * @param iterationType - The `iterationType` parameter determines the type of iteration to be used.
    * It can have two possible values:
@@ -145,7 +145,7 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
 
   override addMany(
     keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[],
-    data?: N['val'][],
+    data?: V[],
     isBalanceAdd = true,
     iterationType = this.iterationType
   ): (N | null | undefined)[] {
@@ -174,7 +174,7 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
     }
 
     let sortedKeysOrNodes: (number | N | null)[] = [],
-      sortedData: (N['val'] | undefined)[] | undefined = [];
+      sortedData: (V | undefined)[] | undefined = [];
 
     if (isNodeOrNullTuple(combinedArr)) {
       sorted = combinedArr.sort((a, b) => a[0].key - b[0].key);
@@ -185,7 +185,7 @@ export class BST<N extends BSTNode<N['val'], N> = BSTNode> extends BinaryTree<N>
     }
     sortedKeysOrNodes = sorted.map(([keyOrNode]) => keyOrNode);
     sortedData = sorted.map(([, val]) => val);
-    const recursive = (arr: (BinaryTreeNodeKey | null | N)[], data?: N['val'][]) => {
+    const recursive = (arr: (BinaryTreeNodeKey | null | N)[], data?: (V | undefined)[]) => {
       if (arr.length === 0) return;
 
       const mid = Math.floor((arr.length - 1) / 2);
diff --git a/src/data-structures/binary-tree/rb-tree.ts b/src/data-structures/binary-tree/rb-tree.ts
index 475f058..b8ef6db 100644
--- a/src/data-structures/binary-tree/rb-tree.ts
+++ b/src/data-structures/binary-tree/rb-tree.ts
@@ -2,9 +2,9 @@ import {BinaryTreeNodeKey, RBColor, RBTreeNodeNested, RBTreeOptions} from '../..
 import {IBinaryTree} from '../../interfaces';
 import {BST, BSTNode} from './bst';
 
-export class RBTreeNode<V = any, FAMILY extends RBTreeNode<V, FAMILY> = RBTreeNodeNested<V>> extends BSTNode<
+export class RBTreeNode<V = any, N extends RBTreeNode<V, N> = RBTreeNodeNested<V>> extends BSTNode<
   V,
-  FAMILY
+  N
 > {
   constructor(key: BinaryTreeNodeKey, val?: V) {
     super(key, val);
@@ -22,16 +22,16 @@ export class RBTreeNode<V = any, FAMILY extends RBTreeNode<V, FAMILY> = RBTreeNo
   }
 }
 
-export class RBTree<N extends RBTreeNode<N['val'], N> = RBTreeNode> extends BST<N> implements IBinaryTree<N> {
+export class RBTree<V, N extends RBTreeNode<V, N> = RBTreeNode> extends BST<V, N> implements IBinaryTree<V, N> {
   constructor(options?: RBTreeOptions) {
     super(options);
   }
 
-  override createNode(key: BinaryTreeNodeKey, val?: N['val']): N {
+  override createNode(key: BinaryTreeNodeKey, val?: V): N {
     return new RBTreeNode(key, val) as N;
   }
 
-  // override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined {
+  // override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: V): N | null | undefined {
   //   const inserted = super.add(keyOrNode, val);
   //   if (inserted) this._fixInsertViolation(inserted);
   //   return inserted;
diff --git a/src/data-structures/binary-tree/tree-multiset.ts b/src/data-structures/binary-tree/tree-multiset.ts
index 9dbf025..3cc76f4 100644
--- a/src/data-structures/binary-tree/tree-multiset.ts
+++ b/src/data-structures/binary-tree/tree-multiset.ts
@@ -12,8 +12,8 @@ import {AVLTree, AVLTreeNode} from './avl-tree';
 
 export class TreeMultisetNode<
   V = any,
-  FAMILY extends TreeMultisetNode<V, FAMILY> = TreeMultisetNodeNested<V>
-> extends AVLTreeNode<V, FAMILY> {
+  N extends TreeMultisetNode<V, N> = TreeMultisetNodeNested<V>
+> extends AVLTreeNode<V, N> {
   count: number;
 
   /**
@@ -35,9 +35,9 @@ export class TreeMultisetNode<
 /**
  * The only distinction between a TreeMultiset and a AVLTree lies in the ability of the former to store duplicate nodes through the utilization of counters.
  */
-export class TreeMultiset<N extends TreeMultisetNode<N['val'], N> = TreeMultisetNode>
-  extends AVLTree<N>
-  implements IBinaryTree<N> {
+export class TreeMultiset<V = any, N extends TreeMultisetNode<V, N> = TreeMultisetNode>
+  extends AVLTree<V, N>
+  implements IBinaryTree<V, N> {
   /**
    * The constructor function for a TreeMultiset class in TypeScript, which extends another class and sets an option to
    * merge duplicated values.
@@ -63,7 +63,7 @@ export class TreeMultiset<N extends TreeMultisetNode<N['val'], N> = TreeMultiset
    * occurrences of the value in the binary search tree node. If not provided, the count will default to 1.
    * @returns A new instance of the BSTNode class with the specified key, value, and count (if provided).
    */
-  override createNode(key: BinaryTreeNodeKey, val?: N['val'], count?: number): N {
+  override createNode(key: BinaryTreeNodeKey, val?: V, count?: number): N {
     return new TreeMultisetNode(key, val, count) as N;
   }
 
@@ -80,7 +80,7 @@ export class TreeMultiset<N extends TreeMultisetNode<N['val'], N> = TreeMultiset
    * count is specified, the default count will be 1.
    * @returns The function `add` returns a value of type `N | null | undefined`.
    */
-  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val'], count = 1): N | null | undefined {
+  override add(keyOrNode: BinaryTreeNodeKey | N | null, val?: V, count = 1): N | null | undefined {
     let inserted: N | null | undefined = undefined,
       newNode: N | null;
     if (keyOrNode instanceof TreeMultisetNode) {
@@ -186,14 +186,14 @@ export class TreeMultiset<N extends TreeMultisetNode<N['val'], N> = TreeMultiset
    * inserted nodes.
    * @param {(BinaryTreeNodeKey | null)[] | (N | null)[]} keysOrNodes - An array of keys or nodes to be
    * added to the multiset. Each element can be either a BinaryTreeNodeKey or a TreeMultisetNode.
-   * @param {N['val'][]} [data] - The `data` parameter is an optional array of values that correspond
+   * @param {V[]} [data] - The `data` parameter is an optional array of values that correspond
    * to the keys or nodes being added to the multiset. It is used to associate additional data with
    * each key or node.
    * @returns The function `addMany` returns an array of `N`, `null`, or `undefined` values.
    */
   override addMany(
     keysOrNodes: (BinaryTreeNodeKey | null)[] | (N | null)[],
-    data?: N['val'][]
+    data?: V[]
   ): (N | null | undefined)[] {
     const inserted: (N | null | undefined)[] = [];
 
@@ -206,7 +206,7 @@ export class TreeMultiset<N extends TreeMultisetNode<N['val'], N> = TreeMultiset
       }
 
       if (keyOrNode === null) {
-        inserted.push(this.add(NaN, null, 0));
+        inserted.push(this.add(NaN, undefined, 0));
         continue;
       }
 
diff --git a/src/interfaces/binary-tree.ts b/src/interfaces/binary-tree.ts
index a499659..61afbfd 100644
--- a/src/interfaces/binary-tree.ts
+++ b/src/interfaces/binary-tree.ts
@@ -1,7 +1,7 @@
 import {BinaryTreeNode} from '../data-structures';
-import {BinaryTreeDeletedResult, BinaryTreeNodeKey, MapCallback} from '../types';
+import {BinaryTreeDeletedResult, BinaryTreeNodeKey, BinaryTreeNodeNested, MapCallback} from '../types';
 
-export interface IBinaryTree<N extends BinaryTreeNode<N['val'], N>> {
+export interface IBinaryTree<V = any, N extends BinaryTreeNode<V, N> = BinaryTreeNodeNested<V>> {
   createNode(key: BinaryTreeNodeKey, val?: N['val']): N;
 
   add(keyOrNode: BinaryTreeNodeKey | N | null, val?: N['val']): N | null | undefined;
diff --git a/test/unit/data-structures/binary-tree/avl-tree.test.ts b/test/unit/data-structures/binary-tree/avl-tree.test.ts
index 1bd8174..01c0e16 100644
--- a/test/unit/data-structures/binary-tree/avl-tree.test.ts
+++ b/test/unit/data-structures/binary-tree/avl-tree.test.ts
@@ -3,7 +3,7 @@ import {AVLTree, AVLTreeNode, CP} from '../../../../src';
 describe('AVL Tree Test', () => {
   it('should perform various operations on a AVL Tree', () => {
     const arr = [11, 3, 15, 1, 8, 13, 16, 2, 6, 9, 12, 14, 4, 7, 10, 5];
-    const tree = new AVLTree<AVLTreeNode<number>>();
+    const tree = new AVLTree<number>();
 
     for (const i of arr) tree.add(i, i);
 
@@ -110,7 +110,7 @@ describe('AVL Tree Test', () => {
 });
 
 describe('AVLTree APIs test', () => {
-  const avl = new AVLTree<AVLTreeNode<{id: number; text: string}>>();
+  const avl = new AVLTree<{id: number; text: string}>();
   beforeEach(() => {
     avl.clear();
   });
diff --git a/test/unit/data-structures/binary-tree/binary-tree.test.ts b/test/unit/data-structures/binary-tree/binary-tree.test.ts
index fcb5f4e..49d87d8 100644
--- a/test/unit/data-structures/binary-tree/binary-tree.test.ts
+++ b/test/unit/data-structures/binary-tree/binary-tree.test.ts
@@ -196,7 +196,7 @@ describe('BinaryTree Morris Traversal', () => {
 });
 
 describe('BinaryTree APIs test', () => {
-  const avl = new AVLTree<AVLTreeNode<{id: number; text: string}>>();
+  const avl = new AVLTree<{id: number; text: string}>();
   beforeEach(() => {
     avl.clear();
   });
diff --git a/test/unit/data-structures/binary-tree/bst.test.ts b/test/unit/data-structures/binary-tree/bst.test.ts
index 9683af9..872223f 100644
--- a/test/unit/data-structures/binary-tree/bst.test.ts
+++ b/test/unit/data-structures/binary-tree/bst.test.ts
@@ -189,7 +189,7 @@ describe('BST operations test', () => {
   });
 
   it('should perform various operations on a Binary Search Tree with object values', () => {
-    const objBST = new BST<BSTNode<{key: number; keyA: number}>>();
+    const objBST = new BST<{key: number; keyA: number}>();
     expect(objBST).toBeInstanceOf(BST);
     objBST.add(11, {key: 11, keyA: 11});
     objBST.add(3, {key: 3, keyA: 3});
diff --git a/test/unit/data-structures/binary-tree/overall.test.ts b/test/unit/data-structures/binary-tree/overall.test.ts
index 5325180..e4301b1 100644
--- a/test/unit/data-structures/binary-tree/overall.test.ts
+++ b/test/unit/data-structures/binary-tree/overall.test.ts
@@ -29,7 +29,7 @@ describe('Overall BinaryTree Test', () => {
     bfsIDs[0] === 11; // true
     expect(bfsIDs[0]).toBe(11);
 
-    const objBST = new BST<BSTNode<{key: number; keyA: number}>>();
+    const objBST = new BST<{key: number; keyA: number}>();
     objBST.add(11, {key: 11, keyA: 11});
     objBST.add(3, {key: 3, keyA: 3});
 
diff --git a/test/unit/data-structures/binary-tree/tree-multiset.test.ts b/test/unit/data-structures/binary-tree/tree-multiset.test.ts
index e0f7125..795ce47 100644
--- a/test/unit/data-structures/binary-tree/tree-multiset.test.ts
+++ b/test/unit/data-structures/binary-tree/tree-multiset.test.ts
@@ -206,7 +206,7 @@ describe('TreeMultiset operations test', () => {
   });
 
   it('should perform various operations on a Binary Search Tree with object values', () => {
-    const objTreeMultiset = new TreeMultiset<TreeMultisetNode<{key: number; keyA: number}>>();
+    const objTreeMultiset = new TreeMultiset<{key: number; keyA: number}>();
     expect(objTreeMultiset).toBeInstanceOf(TreeMultiset);
     objTreeMultiset.add(11, {key: 11, keyA: 11});
     objTreeMultiset.add(3, {key: 3, keyA: 3});