diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
index c4e8c7f325c2..71f4ca7b224d 100644
--- a/packages/babel-helpers/src/helpers.js
+++ b/packages/babel-helpers/src/helpers.js
@@ -588,16 +588,12 @@ helpers.interopRequireDefault = helper("7.0.0-beta.0")`
 `;
 
 helpers.interopRequireWildcard = helper("7.0.0-beta.0")`
-  function _getRequireWildcardCache(obj) {
-    if (typeof global === 'undefined' || typeof WeakMap !== 'function') {
-      return null;
-    }
-
-    if (!global._REQUIRE_WILD_CACHE) {
-      global._REQUIRE_WILD_CACHE = new WeakMap();
-    }
+  function _getRequireWildcardCache() {
+    if (typeof WeakMap !== "function") return null;
 
-    return global._REQUIRE_WILD_CACHE;
+    var cache = new WeakMap();
+    _getRequireWildcardCache = function () { return cache; };
+    return cache;
   }
 
   export default function _interopRequireWildcard(obj) {
@@ -605,19 +601,20 @@ helpers.interopRequireWildcard = helper("7.0.0-beta.0")`
       return obj;
     }
 
-    var cache = _getRequireWildcardCache(obj);
+    var cache = _getRequireWildcardCache();
     if (cache && cache.has(obj)) {
       return cache.get(obj);
     }
 
     var newObj = {};
     if (obj != null) {
+      var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor;
       for (var key in obj) {
         if (Object.prototype.hasOwnProperty.call(obj, key)) {
-          var desc = Object.defineProperty && Object.getOwnPropertyDescriptor
+          var desc = hasPropertyDescriptor
             ? Object.getOwnPropertyDescriptor(obj, key)
-            : {};
-          if (desc.get || desc.set) {
+            : null;
+          if (desc && (desc.get || desc.set)) {
             Object.defineProperty(newObj, key, desc);
           } else {
             newObj[key] = obj[key];
diff --git a/packages/babel-plugin-transform-modules-commonjs/test/fixtures/misc/copy-getters-setters-star/output.js b/packages/babel-plugin-transform-modules-commonjs/test/fixtures/misc/copy-getters-setters-star/output.js
index 8e8188104420..39e2362d7c13 100644
--- a/packages/babel-plugin-transform-modules-commonjs/test/fixtures/misc/copy-getters-setters-star/output.js
+++ b/packages/babel-plugin-transform-modules-commonjs/test/fixtures/misc/copy-getters-setters-star/output.js
@@ -9,6 +9,6 @@ var foo = _interopRequireWildcard(require("./moduleWithGetter"));
 
 exports.foo = foo;
 
-function _getRequireWildcardCache(obj) { if (typeof global === 'undefined' || typeof WeakMap !== 'function') { return null; } if (!global._REQUIRE_WILD_CACHE) { global._REQUIRE_WILD_CACHE = new WeakMap(); } return global._REQUIRE_WILD_CACHE; }
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
 
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(obj); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; cache && cache.set(obj, newObj); return newObj; }
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; cache && cache.set(obj, newObj); return newObj; }
diff --git a/packages/babel-preset-env/test/fixtures/dynamic-import/auto-esm-unsupported-import-unsupported/output.js b/packages/babel-preset-env/test/fixtures/dynamic-import/auto-esm-unsupported-import-unsupported/output.js
index dab4055297cb..60242afb1c72 100644
--- a/packages/babel-preset-env/test/fixtures/dynamic-import/auto-esm-unsupported-import-unsupported/output.js
+++ b/packages/babel-preset-env/test/fixtures/dynamic-import/auto-esm-unsupported-import-unsupported/output.js
@@ -1,8 +1,8 @@
 "use strict";
 
-function _getRequireWildcardCache(obj) { if (typeof global === 'undefined' || typeof WeakMap !== 'function') { return null; } if (!global._REQUIRE_WILD_CACHE) { global._REQUIRE_WILD_CACHE = new WeakMap(); } return global._REQUIRE_WILD_CACHE; }
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
 
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(obj); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
 
 Promise.resolve().then(function () {
   return _interopRequireWildcard(require("foo"));
diff --git a/packages/babel-preset-env/test/fixtures/dynamic-import/modules-amd/output.js b/packages/babel-preset-env/test/fixtures/dynamic-import/modules-amd/output.js
index ac9f1bc851f9..b873c9070825 100644
--- a/packages/babel-preset-env/test/fixtures/dynamic-import/modules-amd/output.js
+++ b/packages/babel-preset-env/test/fixtures/dynamic-import/modules-amd/output.js
@@ -1,7 +1,7 @@
 define(["require"], function (_require) {
-  function _getRequireWildcardCache(obj) { if (typeof global === 'undefined' || typeof WeakMap !== 'function') { return null; } if (!global._REQUIRE_WILD_CACHE) { global._REQUIRE_WILD_CACHE = new WeakMap(); } return global._REQUIRE_WILD_CACHE; }
+  function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
 
-  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(obj); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
+  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
 
   new Promise(function (_resolve, _reject) {
     return _require(["foo"], function (imported) {
diff --git a/packages/babel-preset-env/test/fixtures/dynamic-import/modules-cjs/output.js b/packages/babel-preset-env/test/fixtures/dynamic-import/modules-cjs/output.js
index dab4055297cb..60242afb1c72 100644
--- a/packages/babel-preset-env/test/fixtures/dynamic-import/modules-cjs/output.js
+++ b/packages/babel-preset-env/test/fixtures/dynamic-import/modules-cjs/output.js
@@ -1,8 +1,8 @@
 "use strict";
 
-function _getRequireWildcardCache(obj) { if (typeof global === 'undefined' || typeof WeakMap !== 'function') { return null; } if (!global._REQUIRE_WILD_CACHE) { global._REQUIRE_WILD_CACHE = new WeakMap(); } return global._REQUIRE_WILD_CACHE; }
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
 
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(obj); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; cache && cache.set(obj, newObj); return newObj; }
 
 Promise.resolve().then(function () {
   return _interopRequireWildcard(require("foo"));