Add typescript types

Author: freddydumont

index.d.ts

@@ -0,0 +1,6 @@
+/**
+ * Smooth scrolling onClick event handler
+ * @param {string} selector argument will be passed to `querySelector`, usually an HTML id
+ */
+declare const scrollTo: (selector: string) => void;
+export default scrollTo;

package.json

@@ -32,5 +32,6 @@
     "@babel/core": "^7.6.0",
     "babel-preset-gatsby-package": "^0.2.4",
     "cross-env": "^5.2.1"
-  }
+  },
+  "types": "index.d.ts"
 }