diff --git a/hashset/hashset-tests.ts b/hashset/hashset-tests.ts
new file mode 100644
index 000000000..fda2e4d1a
--- /dev/null
+++ b/hashset/hashset-tests.ts
@@ -0,0 +1,36 @@
+/// <reference path="hashset.d.ts" />
+
+class Point {
+    constructor(public x: number, public y: number) {
+    }
+}
+
+function hashPoint(p: Point) {
+    return "Point:" + p.x + "," + p.y;
+}
+
+function pointsEqual(p1: Point, p2: Point) {
+    return p1.x === p2.x && p1.y === p2.y;
+}
+
+var points = new HashSet<Point>({ hashCode: hashPoint, equals: pointsEqual });
+
+points.add(new Point(1, 2));
+points.add(new Point(2, 3));
+points.add(new Point(1, 2));
+points.add(new Point(6, 5));
+
+alert(points.size()); // Alerts 3
+
+var otherPoints = new HashSet<Point>({ hashCode: hashPoint, equals: pointsEqual });
+
+otherPoints.add(new Point(4, 4));
+otherPoints.add(new Point(7, 9));
+otherPoints.add(new Point(2, 3));
+otherPoints.add(new Point(6, 5));
+
+var intersection = points.intersection(otherPoints);
+
+alert(intersection.contains(new Point(2, 3))); // Alerts true
+alert(intersection.contains(new Point(7, 9))); // Alerts false
+alert(intersection.size()); // Alerts 2
diff --git a/hashset/hashset.d.ts b/hashset/hashset.d.ts
new file mode 100644
index 000000000..cca5af535
--- /dev/null
+++ b/hashset/hashset.d.ts
@@ -0,0 +1,38 @@
+// Type definitions for jshashset 3.0
+// Project: http://www.timdown.co.uk/jshashtable/jshashset.html
+// Definitions by: Sergey Gerasimov <https://github.com/gerichhome/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../hashtable/hashtable.d.ts" />
+
+interface IHashSet<TValue>
+{
+    add(value: TValue): void;
+    addAll(arr: TValue[]): void;
+    contains(value: TValue): boolean;
+
+    clear(): void;
+    isEmpty(): boolean; values(): TValue[];
+
+    remove(value: TValue): void;
+    size(): number;
+
+    clone(): IHashSet<TValue>;
+
+    isSubsetOf(set: IHashSet<TValue>): boolean;
+    intersection(set: IHashSet<TValue>): IHashSet<TValue>;
+    union(set: IHashSet<TValue>): IHashSet<TValue>;
+    complement(set: IHashSet<TValue>): IHashSet<TValue>;
+}
+
+interface IHashSetStatic {
+    new <TValue>(): IHashSet<TValue>;
+    new <TValue>(options: IHashtableOptions<TValue>): IHashSet<TValue>;
+    new <TValue>(hashCode?: (value: TValue) => any, equals?: (value1: TValue, value2: TValue) => boolean): IHashSet<TValue>;
+}
+
+declare var HashSet: IHashSetStatic;
+
+declare module "hashset" {
+    export = HashSet;
+}
\ No newline at end of file