diff --git a/package.json b/package.json
index b281b63..de79d29 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "url": "https://github.com/joshforisha/open-simplex-noise-js/issues"
   },
   "files": [
-    "lib"
+    "src"
   ],
   "contributors": [
     "Florian Völker <Neirolf2030@web.de>"
diff --git a/src/index.ts b/src/index.ts
index 7a6c315..7b6875c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -22,11 +22,11 @@ import {
   p4D
 } from "./constants";
 
-type Noise2D = (x: number, y: number) => number;
+export type Noise2D = (x: number, y: number) => number;
 
-type Noise3D = (x: number, y: number, z: number) => number;
+export type Noise3D = (x: number, y: number, z: number) => number;
 
-type Noise4D = (x: number, y: number, z: number, w: number) => number;
+export type Noise4D = (x: number, y: number, z: number, w: number) => number;
 
 interface Contribution2D {
   dx: number;