diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..7352a13
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,18 @@
+declare module "webcpu" {
+    interface DetectionOptions {
+        hardcore?: boolean
+        estimateInNode?: boolean
+    }
+
+    interface WebCPUResults {
+        reportedCores: number | null
+        estimatedIdleCores: number
+        estimatedPhysicalCores: number
+    }
+
+    interface WebCPULib {
+        detectCPU: (options?: DetectionOptions) => Promise<WebCPUResults>
+    }
+
+    export const WebCPU: WebCPULib 
+}