refactor: polyfills review

src/polyfills/WeakRef.js

@@ -1,33 +1,16 @@
-(function (global) {
-  if (typeof global === "object" && global) {
-    if (typeof global["WeakRef"] === "undefined") {
-      global.WeakRef = (function (wm) {
-        function WeakRef(target) {
-          wm.set(this, target);
-        }
-
-        WeakRef.prototype.deref = function () {
-          return wm.get(this);
-        };
-
-        return WeakRef;
-      })(new WeakMap());
-    }
+(function () {
+  if (typeof window.WeakRef !== "undefined") {
+    return;
   }
-})(
-  (function () {
-    switch (true) {
-      case typeof globalThis === "object" && !!globalThis:
-        return globalThis;
-      case typeof self === "object" && !!self:
-        return self;
-      case typeof window === "object" && !!window:
-        return window;
-      case typeof global === "object" && !!global:
-        return global;
-      case typeof Function === "function":
-        return Function("return this")();
+
+  window.WeakRef = (function (weakMap) {
+    function WeakRef(target) {
+      weakMap.set(this, target);
     }
-    return null;
-  })()
-);
+    WeakRef.prototype.deref = function () {
+      return weakMap.get(this);
+    };
+
+    return WeakRef;
+  })(new WeakMap());
+})();