diff --git a/hashtable/hashtable.d.ts b/hashtable/hashtable.d.ts
new file mode 100644
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+++ 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);
+
+    get(key: TKey): TValue;
+    containsKey(key: TKey): boolean;
+    containsValue(value: TValue): boolean;
+
+    clear();
+    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);
+
+    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;
+}
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