diff --git a/rhill-voronoi-core.d.ts b/rhill-voronoi-core.d.ts
new file mode 100644
index 0000000..e908fbb
--- /dev/null
+++ b/rhill-voronoi-core.d.ts
@@ -0,0 +1,56 @@
+
+declare namespace Voronoi {
+    class Point {
+        x: number;
+        y: number;
+    }
+
+    class Site {
+        x: number;
+        y: number;
+        voronoiId: number;
+    }
+
+    class Cell {
+        site: Site;
+        halfedges: HalfEdge[];
+        closeMe: boolean;
+    }
+
+    class Edge {
+        lSite: Site;
+        rSite: Site;
+        vb: Point;
+        va: Point;
+    }
+
+    class HalfEdge {
+        site: Site;
+        edge: Edge;
+        angle: number;
+        getStartpoint(): Point;
+        getEndpoint(): Point;
+    }
+
+    class BBox {
+        xl: number;
+        xr: number;
+        yt: number;
+        yb: number;
+    }
+
+    class VoronoiDiagram {
+        site: any;
+        cells: Cell[];
+        edges: Edge[];
+        vertices: Point[];
+        execTime: number;
+    }
+}
+
+declare class Voronoi {
+    constructor();
+    compute(sites: Voronoi.Point[], bbox: Voronoi.BBox): Voronoi.VoronoiDiagram;
+}
+
+export = Voronoi;