diff --git a/src/maxHeap.d.ts b/src/maxHeap.d.ts
index 4d7806f..ecd0023 100644
--- a/src/maxHeap.d.ts
+++ b/src/maxHeap.d.ts
@@ -4,24 +4,12 @@ export interface IGetCompareValue<T> {
   (value: T): number | string;
 }
 
-export class MaxHeap<T> implements Iterable<T> {
-  constructor(getCompareValue?: IGetCompareValue<T>, _heap?: Heap<T>);
-  toArray(): T[];
-  [Symbol.iterator](): Iterator<T, any, undefined>;
+export class MaxHeap<T> extends Heap<T> {
+  constructor(getCompareValue?: IGetCompareValue<T>, values?: T[]);
   insert(value: T): MaxHeap<T>;
   push(value: T): MaxHeap<T>;
-  extractRoot(): T | null;
-  pop(): T | null;
-  sort(): T[];
   fix(): MaxHeap<T>;
-  isValid(): boolean;
   clone(): MaxHeap<T>;
-  root(): T | null;
-  top(): T | null;
-  leaf(): T | null;
-  size(): number;
-  isEmpty(): boolean;
-  clear(): void;
   static heapify<T>(
     values: T[],
     getCompareValue?: IGetCompareValue<T>
diff --git a/src/minHeap.d.ts b/src/minHeap.d.ts
index d430004..b4bb117 100644
--- a/src/minHeap.d.ts
+++ b/src/minHeap.d.ts
@@ -1,24 +1,12 @@
 import { Heap } from "./heap";
 import { IGetCompareValue } from "./maxHeap";
 
-export class MinHeap<T> implements Iterable<T> {
-  constructor(getCompareValue?: IGetCompareValue<T>, _heap?: Heap<T>);
-  toArray(): T[];
-  [Symbol.iterator](): Iterator<T, any, undefined>;
+export class MinHeap<T> extends Heap<T> {
+  constructor(getCompareValue?: IGetCompareValue<T>, values?: T[]);
   insert(value: T): MinHeap<T>;
   push(value: T): MinHeap<T>;
-  extractRoot(): T | null;
-  pop(): T | null;
-  sort(): T[];
   fix(): MinHeap<T>;
-  isValid(): boolean;
   clone(): MinHeap<T>;
-  root(): T | null;
-  top(): T | null;
-  leaf(): T | null;
-  size(): number;
-  isEmpty(): boolean;
-  clear(): void;
   static heapify<T>(
     values: T[],
     getCompareValue?: IGetCompareValue<T>