fix(d.ts)

types/iterators/Bidirectional.d.ts

@@ -1,6 +1,6 @@
 import { ForwardIterator } from "./Forward";
 
-export interface BidirectionalIterator<T> extends ForwardIterator<T> {
+export class BidirectionalIterator<T> extends ForwardIterator<T> {
   /**
     * decrements iterator, it doesn't make copy
     * @returns {this}

types/iterators/Forward.d.ts

@@ -1,8 +1,8 @@
-export interface Item<T> {
+export class Item<T> {
   value: T
 }
 
-export interface ForwardIterator<T> {
+export class ForwardIterator<T> {
   clone(): ForwardIterator<T>;
   copy(rhs: ForwardIterator<T>): this;
   get value(): T;

types/iterators/RandomAccess.d.ts

@@ -1,6 +1,6 @@
 import { BidirectionalIterator } from "./Bidirectional";
 
-export interface RandomAccessIterator<T> extends BidirectionalIterator<T> {
+export class RandomAccessIterator<T> extends BidirectionalIterator<T> {
   sub(offset: number): this;
   add(offset: number): this;
   cmp(rhs: RandomAccessIterator<T>): number;