diff --git a/point-in-polygon/point-in-polygon-tests.ts b/point-in-polygon/point-in-polygon-tests.ts
new file mode 100644
index 0000000000..39851bd00e
--- /dev/null
+++ b/point-in-polygon/point-in-polygon-tests.ts
@@ -0,0 +1,6 @@
+/// <reference path="point-in-polygon.d.ts" />
+
+import inside from 'point-in-polygon';
+
+const polygon = [ [ 1, 1 ], [ 1, 2 ], [ 2, 2 ], [ 2, 1 ] ];
+const inPolygon: boolean = inside([ 1.5, 1.5 ], polygon);
diff --git a/point-in-polygon/point-in-polygon.d.ts b/point-in-polygon/point-in-polygon.d.ts
new file mode 100644
index 0000000000..ceb85ecdec
--- /dev/null
+++ b/point-in-polygon/point-in-polygon.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for point-in-polygon
+// Project: https://github.com/substack/point-in-polygon
+// Definitions by: kogai <https://github.com/kogai>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module 'point-in-polygon' {
+    export default function inside(point: number[], polygon: number[][]): boolean;
+}