diff --git a/ndarray/ndarray-test.ts b/ndarray/ndarray-test.ts
new file mode 100644
index 0000000000..1c4e829d90
--- /dev/null
+++ b/ndarray/ndarray-test.ts
@@ -0,0 +1,27 @@
+/// <reference path="ndarray.d.ts" />
+
+import ndarray = require('ndarray');
+
+const data = new Int32Array(2 * 2 * 2 + 10);
+const a = ndarray(data, [2, 2, 2], [1, 2, 4], 5);
+
+console.log(a.data === data);
+console.log(a.shape[0] === 2);
+console.log(a.shape[1] === 2);
+console.log(a.shape[2] === 2);
+console.log(a.stride[0] === 1);
+console.log(a.stride[1] === 2);
+console.log(a.stride[2] === 4);
+console.log(a.offset === 5);
+console.log(a.dtype === 'int32');
+console.log(a.size === 8);
+console.log(a.order[0] === 0);
+console.log(a.order[1] === 1);
+console.log(a.order[2] === 2);
+console.log(a.dimension === 3);
+console.log(a.set(0, 0, 0, 1) === 1);
+console.log(a.get(0, 0, 0) === 1);
+console.log(a.index(1, 1, 1) === 12);
+
+const b = a.lo(0, 0, 0).hi(1, 1, 1);
+const c = b.step(0).transpose(0, 0, 0).pick(null, null, 0);
diff --git a/ndarray/ndarray.d.ts b/ndarray/ndarray.d.ts
new file mode 100644
index 0000000000..64be7833ba
--- /dev/null
+++ b/ndarray/ndarray.d.ts
@@ -0,0 +1,35 @@
+// Type definitions for ndarray v1.0.18
+// Project: https://github.com/scijs/ndarray
+// Definitions by: Giff Song <https://github.com/pawsong/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module 'ndarray' {
+  type Data =
+    Array<number> | Int8Array | Int16Array | Int32Array |
+    Uint8Array | Uint16Array | Uint32Array |
+    Float32Array | Float64Array | Uint8ClampedArray;
+
+  interface ndarray {
+    data: Data;
+    shape: number[];
+    stride: number[];
+    offset: number;
+    dtype: 'int8' | 'int16' | 'int32' | 'uint8' | 'uint16' |'uint32' |
+           'float32' | 'float64' | 'array'| 'uint8_clamped' | 'buffer' | 'generic';
+    size: number;
+    order: number[];
+    dimension: number;
+    get(...args: number[]): number;
+    set(...args: number[]): number;
+    index(...args: number[]): number;
+    lo(...args: number[]): ndarray;
+    hi(...args: number[]): ndarray;
+    step(...args: number[]): ndarray;
+    transpose(...args: number[]): ndarray;
+    pick(...args: number[]): ndarray;
+  }
+
+  function ndarray(data: Data, shape?: number[], stride?: number[], offset?: number): ndarray;
+
+  export = ndarray;
+}