diff --git a/types/xxhashjs/index.d.ts b/types/xxhashjs/index.d.ts
index 40c45cf3ab..9c9d7e4318 100644
--- a/types/xxhashjs/index.d.ts
+++ b/types/xxhashjs/index.d.ts
@@ -1,19 +1,29 @@
-// Type definitions for xxhashjs 0.1
+// Type definitions for xxhashjs 0.2
 // Project: https://github.com/pierrec/js-xxhash
 // Definitions by: Dibyo Majumdar <https://github.com/mDibyo>
+//                 Nick Zahn <https://github.com/Manc>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+/// <reference types="node" />
+
 export as namespace XXH;
 
+// Ideally we would have a type definition for the "cuint" package.
+// The following interface `UINT` is to resolve the bare minimum.
+interface UINT {
+	toNumber(): number;
+	toString(radix?: number): string;
+}
+
 export interface HashObject {
-  init(seed: number): this;
-  update(data: string | ArrayBuffer): this;
-  digest(): number;
+	init(seed: number): this;
+	update(data: string | ArrayBuffer | Buffer): this;
+	digest(): UINT;
 }
 
 export interface HashInterface {
-  (seed?: number): HashObject;
-  (data: string | ArrayBuffer, seed: number): number;
+	(seed?: number): HashObject;
+	(data: string | ArrayBuffer | Buffer, seed: number): UINT;
 }
 
 export const h32: HashInterface;
diff --git a/types/xxhashjs/xxhashjs-tests.ts b/types/xxhashjs/xxhashjs-tests.ts
index ee2d7ef8f3..889bf9bb40 100644
--- a/types/xxhashjs/xxhashjs-tests.ts
+++ b/types/xxhashjs/xxhashjs-tests.ts
@@ -1,7 +1,37 @@
 import XXH from 'xxhashjs';
 
-// examples adapted from https://github.com/pierrec/js-xxhash
-const h1 = XXH.h32('abcd', 0xABCD).toString(16);
+// Test data
+const seed = 0xABCD;
+const stringData = 'abcd';
+const arrayBufferData = new ArrayBuffer(4);
+const bufferData = Buffer.from([1, 2, 3, 4]);
 
-const H = XXH.h32(0xABCD);
-const h2 = H.update('abcd').digest().toString(16);
+// Test XXH.h32 methods, initialising with string data
+const value32_1 = XXH.h32(stringData, seed);
+value32_1.toString();
+value32_1.toString(16);
+value32_1.toNumber();
+
+const value32_2 = XXH.h32(seed).update(stringData).digest();
+value32_2.toString();
+value32_2.toString(16);
+value32_2.toNumber();
+
+// Test XXH.h64 methods, initialising with string data
+const value64_1 = XXH.h64(stringData, seed);
+value64_1.toString();
+value64_1.toString(16);
+value64_1.toNumber();
+
+const value64_2 = XXH.h64(seed).update(stringData).digest();
+value64_2.toString();
+value64_2.toString(16);
+value64_2.toNumber();
+
+// Initialise with ArrayBuffer
+XXH.h32(arrayBufferData, seed);
+XXH.h64(arrayBufferData, seed);
+
+// Initialise with Buffer
+XXH.h32(bufferData, seed);
+XXH.h64(bufferData, seed);