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node_modules/core-js/internals/proxy-accessor.js

@@ -0,0 +1,10 @@
+'use strict';
+var defineProperty = require('../internals/object-define-property').f;
+
+module.exports = function (Target, Source, key) {
+  key in Target || defineProperty(Target, key, {
+    configurable: true,
+    get: function () { return Source[key]; },
+    set: function (it) { Source[key] = it; }
+  });
+};