diff --git a/hashtable/hashtable-tests.ts b/hashtable/hashtable-tests.ts
new file mode 100644
index 0000000000..9c90b5729d
--- /dev/null
+++ b/hashtable/hashtable-tests.ts
@@ -0,0 +1,25 @@
+/// <reference path="hashtable.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 coloursForPoints = new Hashtable<Point, string>({ hashCode: hashPoint, equals: pointsEqual });
+
+function getColourAt(x: number, y: number) {
+    var point = new Point(x, y);
+    return coloursForPoints.get(point);
+}
+
+coloursForPoints.put(new Point(1, 2), "green");
+
+alert(getColourAt(1, 2)); // Alerts green
\ No newline at end of file
diff --git a/hashtable/hashtable.d.ts b/hashtable/hashtable.d.ts
new file mode 100644
index 0000000000..1a5ac47b9c
--- /dev/null
+++ b/hashtable/hashtable.d.ts
@@ -0,0 +1,48 @@
+// Type definitions for jshashtable 3.0
+// Project: http://www.timdown.co.uk/jshashtable/
+// Definitions by: Sergey Gerasimov <https://github.com/gerichhome/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface IHashtable<TKey, TValue>
+{
+    put(key: TKey, value: TValue): TValue;
+    putAll(hashtable: IHashtable<TKey, TValue>, conflictCallback?: (key: TKey, thisValue: TValue, value: TValue) => TValue): void;
+
+    get(key: TKey): TValue;
+    containsKey(key: TKey): boolean;
+    containsValue(value: TValue): boolean;
+
+    clear(): void;
+    isEmpty(): boolean;
+
+    keys(): TKey[];
+    values(): TValue[];
+    entries(): any[][];
+
+    remove(key: TKey): TValue;
+    size(): number;
+
+    clone(): IHashtable<TKey, TValue>;
+    each(callback: (key: TKey, value: TValue) => void): void;
+
+    equals(hashtable: IHashtable<TKey, TValue>): boolean;
+    toQueryString(): string;
+}
+
+interface IHashtableOptions<TKey> {
+    hashCode?: (key: TKey) => any;
+    equals?: (key1: TKey, key2: TKey) => boolean;
+    replaceDuplicateKey?: boolean;
+}
+
+interface IHashtableStatic {
+    new <TKey, TValue>(): IHashtable<TKey, TValue>;
+    new <TKey, TValue>(options: IHashtableOptions<TKey>): IHashtable<TKey, TValue>;
+    new <TKey, TValue>(hashCode?: (value: TValue) => any, equals?: (value1: TValue, value2: TValue) => boolean): IHashtable<TKey, TValue>;
+}
+
+declare var Hashtable: IHashtableStatic;
+
+declare module "hashtable" {
+    export = Hashtable;
+}
\ No newline at end of file