build: polyfills

src/polyfills/WeakRef.js

@@ -0,0 +1,33 @@
+(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 () {
+    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")();
+    }
+    return null;
+  })()
+);