fix: browser detection

update browser detection logic:
detect either window or web worker (WorkerGlobalScope).

fixes #8299 #8284

Author: JoseVSeb

.changeset/chilly-moons-play.md

@@ -0,0 +1,5 @@
+---
+'@firebase/util': patch
+---
+
+fix: browser detection (detect either window or web worker)

config/tsconfig.base.json

@@ -7,6 +7,7 @@
     "lib": [
       "es5",
       "dom",
+      "WebWorker",
       "es2015.promise",
       "es2015.symbol",
       "es2015.iterable",

packages/util/src/environment.ts

@@ -77,7 +77,17 @@ export function isNode(): boolean {
  * Detect Browser Environment
  */
 export function isBrowser(): boolean {
-  return typeof self === 'object' && self.self === self;
+  return typeof window !== 'undefined' || isWebWorker();
+}
+
+/**
+ * Detect Web Worker context
+ */
+export function isWebWorker(): boolean {
+  return (
+    typeof WorkerGlobalScope !== 'undefined' &&
+    self instanceof WorkerGlobalScope
+  );
 }
 
 /**