fix globalThis check (#9)

Author: Le0Developer

HISTORY.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - `onTimeout` callback not properly registering
 - `ref` not passing properly - pass `userRef` instead
+- `globalThis` errors on older browsers
 
 ### Removed
 

src/index.tsx

@@ -1,7 +1,7 @@
 import React, { useEffect, useState, useRef } from "react";
 import { TurnstileOptions, SupportedLanguages } from "turnstile-types";
 
-const global = (globalThis ?? window) as any;
+const global = (typeof globalThis !== "undefined" ? globalThis : window) as any;
 let turnstileState =
   typeof global.turnstile !== "undefined" ? "ready" : "unloaded";
 let ensureTurnstile: () => Promise<any>;