Fix condition

Author: ilyalesik

README.md

@@ -6,7 +6,7 @@
 
 React hook for conveniently use Fetch API.
 
-* **Tiny** (397 B). Calculated by [size-limit](https://github.com/ai/size-limit)
+* **Tiny** (408 B). Calculated by [size-limit](https://github.com/ai/size-limit)
 * Both **Flow** and **TypeScript** types included
 
 ```javascript

package.json

@@ -30,7 +30,7 @@
       "ignore": [
         "react"
       ],
-      "limit": "397 B",
+      "limit": "408 B",
       "path": "index.js",
       "running": false
     }

utils/flattenInput.js

@@ -6,7 +6,7 @@ function flattenInput () {
       for (var j = 0; j < input.length; j++) {
         res = res.concat(flattenInput(input[j]))
       }
-    } else if (typeof URL || "undefined" && input instanceof URL) {
+    } else if (typeof URL !== "undefined" && input instanceof URL) {
       res = res.concat(input.toJSON())
     } else if (input instanceof Object) {
       var keys = Object.keys(input)