diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..b7af8bd
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,21 @@
+// index.d.ts
+declare module 'solar-spa' {
+    export default function spa(
+      date: Date,
+      latitude: number,
+      longitude: number,
+      elevation?: number,
+      temperature?: number,
+      pressure?: number,
+      refraction?: number
+    ): Promise<{
+      zenith: number;
+      azimuth: number;
+      incidence: number;
+      sunrise: number;
+      sunset: number;
+      solar_noon: number;
+      sun_transit_alt: number;
+    }>;
+  }
+  
\ No newline at end of file
diff --git a/package.json b/package.json
index 3119f52..f9cec82 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
   "name": "solar-spa",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "NREL Solar Position Algorithm (SPA) in WebAssembly",
   "main": "solar-spa.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "node test.js"
   },
diff --git a/solar-spa.js b/solar-spa.js
index 5fb72f8..1c06bb9 100644
--- a/solar-spa.js
+++ b/solar-spa.js
@@ -1,5 +1,11 @@
+// solar-spa.js
+const path = require('path');
 const spaModule = require('./spa.js');
 
+// Set the wasm file path
+spaModule.locateFile = (filename) => {
+  return path.join(__dirname, filename);
+};
 module.exports = function spa(
   date,
   latitude,