Add polyfill to globalThis

fix: #38

src/GoTrueClient.ts

@@ -10,6 +10,9 @@ import {
   AuthChangeEvent,
   CookieOptions,
 } from './lib/types'
+import { polyfillGlobalThis } from './lib/polyfills'
+
+polyfillGlobalThis() // Make "globalThis" available
 
 const DEFAULT_OPTIONS = {
   url: GOTRUE_URL,

src/lib/polyfills.ts

@@ -0,0 +1,16 @@
+// @ts-nocheck
+
+/**
+ * https://mathiasbynens.be/notes/globalthis
+ */
+export function polyfillGlobalThis() {
+  if (typeof globalThis === 'object') return
+  Object.defineProperty(Object.prototype, '__magic__', {
+    get: function () {
+      return this
+    },
+    configurable: true,
+  })
+  __magic__.globalThis = __magic__
+  delete Object.prototype.__magic__
+}