diff --git a/tests/baselines/reference/asyncFunctionTempVariableScoping.js b/tests/baselines/reference/asyncFunctionTempVariableScoping.js
index c237e03e0f6f1..51a589e8526aa 100644
--- a/tests/baselines/reference/asyncFunctionTempVariableScoping.js
+++ b/tests/baselines/reference/asyncFunctionTempVariableScoping.js
@@ -45,8 +45,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var _this = this;
diff --git a/tests/baselines/reference/destructuringAssignmentWithStrictNullChecks.js b/tests/baselines/reference/destructuringAssignmentWithStrictNullChecks.js
index 52bac6e239123..3c21233ea8ea5 100644
--- a/tests/baselines/reference/destructuringAssignmentWithStrictNullChecks.js
+++ b/tests/baselines/reference/destructuringAssignmentWithStrictNullChecks.js
@@ -9,8 +9,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var bar;
diff --git a/tests/baselines/reference/destructuringInitializerContextualTypeFromContext.js b/tests/baselines/reference/destructuringInitializerContextualTypeFromContext.js
index 1215d343df009..f297eb31dfcf9 100644
--- a/tests/baselines/reference/destructuringInitializerContextualTypeFromContext.js
+++ b/tests/baselines/reference/destructuringInitializerContextualTypeFromContext.js
@@ -43,8 +43,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var Parent = function (_a) {
diff --git a/tests/baselines/reference/destructuringObjectBindingPatternAndAssignment5.js b/tests/baselines/reference/destructuringObjectBindingPatternAndAssignment5.js
index 4eb341b0561e6..e1b13dc239a7c 100644
--- a/tests/baselines/reference/destructuringObjectBindingPatternAndAssignment5.js
+++ b/tests/baselines/reference/destructuringObjectBindingPatternAndAssignment5.js
@@ -12,8 +12,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function a() {
diff --git a/tests/baselines/reference/forLoopWithDestructuringDoesNotElideFollowingStatement.js b/tests/baselines/reference/forLoopWithDestructuringDoesNotElideFollowingStatement.js
index fb2316426ee57..5ba3c5e545d12 100644
--- a/tests/baselines/reference/forLoopWithDestructuringDoesNotElideFollowingStatement.js
+++ b/tests/baselines/reference/forLoopWithDestructuringDoesNotElideFollowingStatement.js
@@ -9,8 +9,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var array = [{ a: 0, b: 1 }];
diff --git a/tests/baselines/reference/genericIsNeverEmptyObject.js b/tests/baselines/reference/genericIsNeverEmptyObject.js
index d914813ed99fc..ef53c353007d3 100644
--- a/tests/baselines/reference/genericIsNeverEmptyObject.js
+++ b/tests/baselines/reference/genericIsNeverEmptyObject.js
@@ -29,8 +29,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function test(obj) {
diff --git a/tests/baselines/reference/genericObjectRest.js b/tests/baselines/reference/genericObjectRest.js
index 33de97a3d5f6a..d7b395e7d01e5 100644
--- a/tests/baselines/reference/genericObjectRest.js
+++ b/tests/baselines/reference/genericObjectRest.js
@@ -35,8 +35,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 const a = 'a';
diff --git a/tests/baselines/reference/literalTypeWidening.js b/tests/baselines/reference/literalTypeWidening.js
index 93655fe0fc989..42dbacdd4ca39 100644
--- a/tests/baselines/reference/literalTypeWidening.js
+++ b/tests/baselines/reference/literalTypeWidening.js
@@ -156,8 +156,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 exports.__esModule = true;
diff --git a/tests/baselines/reference/mappedTypeConstraints.js b/tests/baselines/reference/mappedTypeConstraints.js
index 0565af1c6ecd2..7a969a33269c2 100644
--- a/tests/baselines/reference/mappedTypeConstraints.js
+++ b/tests/baselines/reference/mappedTypeConstraints.js
@@ -42,8 +42,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function f0(obj) {
diff --git a/tests/baselines/reference/nonPrimitiveAccessProperty.js b/tests/baselines/reference/nonPrimitiveAccessProperty.js
index abfe2605e3266..834149360b074 100644
--- a/tests/baselines/reference/nonPrimitiveAccessProperty.js
+++ b/tests/baselines/reference/nonPrimitiveAccessProperty.js
@@ -13,8 +13,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var a;
diff --git a/tests/baselines/reference/objectBindingPattern_restElementWithPropertyName.js b/tests/baselines/reference/objectBindingPattern_restElementWithPropertyName.js
index a63527b8c3544..fa92c7409c0a4 100644
--- a/tests/baselines/reference/objectBindingPattern_restElementWithPropertyName.js
+++ b/tests/baselines/reference/objectBindingPattern_restElementWithPropertyName.js
@@ -8,8 +8,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var b = __rest({}, []);
diff --git a/tests/baselines/reference/objectRest.js b/tests/baselines/reference/objectRest.js
index c9d6a2a7d2b3f..04fe41d7ed3af 100644
--- a/tests/baselines/reference/objectRest.js
+++ b/tests/baselines/reference/objectRest.js
@@ -53,8 +53,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var _a, _b, _c, _d, _e;
diff --git a/tests/baselines/reference/objectRestAssignment.js b/tests/baselines/reference/objectRestAssignment.js
index 711e5de42c079..88fa2d1898985 100644
--- a/tests/baselines/reference/objectRestAssignment.js
+++ b/tests/baselines/reference/objectRestAssignment.js
@@ -20,8 +20,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var _a, _b, _c;
diff --git a/tests/baselines/reference/objectRestForOf.js b/tests/baselines/reference/objectRestForOf.js
index 7ff72db06e59f..a995281b72e02 100644
--- a/tests/baselines/reference/objectRestForOf.js
+++ b/tests/baselines/reference/objectRestForOf.js
@@ -20,8 +20,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 let array;
diff --git a/tests/baselines/reference/objectRestNegative.js b/tests/baselines/reference/objectRestNegative.js
index 915e0a0e86732..fad2efd4eaa03 100644
--- a/tests/baselines/reference/objectRestNegative.js
+++ b/tests/baselines/reference/objectRestNegative.js
@@ -24,8 +24,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var o = { a: 1, b: 'no' };
diff --git a/tests/baselines/reference/objectRestParameter.js b/tests/baselines/reference/objectRestParameter.js
index a73e9b77b38f2..52740d916b685 100644
--- a/tests/baselines/reference/objectRestParameter.js
+++ b/tests/baselines/reference/objectRestParameter.js
@@ -27,8 +27,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function cloneAgain(_a) {
diff --git a/tests/baselines/reference/objectRestParameterES5.js b/tests/baselines/reference/objectRestParameterES5.js
index 7f81d6d736c1d..bdcf24f5032a0 100644
--- a/tests/baselines/reference/objectRestParameterES5.js
+++ b/tests/baselines/reference/objectRestParameterES5.js
@@ -27,8 +27,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function cloneAgain(_a) {
diff --git a/tests/baselines/reference/objectRestReadonly.js b/tests/baselines/reference/objectRestReadonly.js
index a940dbf52cc11..9bc561fa5b50f 100644
--- a/tests/baselines/reference/objectRestReadonly.js
+++ b/tests/baselines/reference/objectRestReadonly.js
@@ -23,8 +23,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var obj = {
diff --git a/tests/baselines/reference/parameterInitializerBeforeDestructuringEmit.js b/tests/baselines/reference/parameterInitializerBeforeDestructuringEmit.js
index 91a5484b6ee3f..ffee9029d30ed 100644
--- a/tests/baselines/reference/parameterInitializerBeforeDestructuringEmit.js
+++ b/tests/baselines/reference/parameterInitializerBeforeDestructuringEmit.js
@@ -26,8 +26,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function foobar(_a) {
diff --git a/tests/baselines/reference/restIntersection.js b/tests/baselines/reference/restIntersection.js
index d1f9aa3094cc4..b225b1328809b 100644
--- a/tests/baselines/reference/restIntersection.js
+++ b/tests/baselines/reference/restIntersection.js
@@ -11,8 +11,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var intersection;
diff --git a/tests/baselines/reference/restInvalidArgumentType.js b/tests/baselines/reference/restInvalidArgumentType.js
index 75b52a8c6e81c..a591da4a92936 100644
--- a/tests/baselines/reference/restInvalidArgumentType.js
+++ b/tests/baselines/reference/restInvalidArgumentType.js
@@ -61,8 +61,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var E;
diff --git a/tests/baselines/reference/restParameterWithBindingPattern3.js b/tests/baselines/reference/restParameterWithBindingPattern3.js
index 00342e7f741c5..87652a5302ce7 100644
--- a/tests/baselines/reference/restParameterWithBindingPattern3.js
+++ b/tests/baselines/reference/restParameterWithBindingPattern3.js
@@ -15,8 +15,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function a() {
diff --git a/tests/baselines/reference/restUnion.js b/tests/baselines/reference/restUnion.js
index 09a6243d2a957..80d522811733f 100644
--- a/tests/baselines/reference/restUnion.js
+++ b/tests/baselines/reference/restUnion.js
@@ -21,8 +21,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var union;
diff --git a/tests/baselines/reference/restUnion2.js b/tests/baselines/reference/restUnion2.js
index 437ea78019368..21ae81b3381a3 100644
--- a/tests/baselines/reference/restUnion2.js
+++ b/tests/baselines/reference/restUnion2.js
@@ -15,8 +15,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var rest2;
diff --git a/tests/baselines/reference/restUnion3.js b/tests/baselines/reference/restUnion3.js
index 0dbfc425754e7..bbb60ae1dae66 100644
--- a/tests/baselines/reference/restUnion3.js
+++ b/tests/baselines/reference/restUnion3.js
@@ -15,8 +15,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var rest4;
diff --git a/tests/baselines/reference/trailingCommasInBindingPatterns.js b/tests/baselines/reference/trailingCommasInBindingPatterns.js
index 0c51acc8af854..4b828873d4d3c 100644
--- a/tests/baselines/reference/trailingCommasInBindingPatterns.js
+++ b/tests/baselines/reference/trailingCommasInBindingPatterns.js
@@ -19,8 +19,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 var a = [].slice(0);
diff --git a/tests/baselines/reference/unknownType1.js b/tests/baselines/reference/unknownType1.js
index b7e40954359f2..febf595aa5b00 100644
--- a/tests/baselines/reference/unknownType1.js
+++ b/tests/baselines/reference/unknownType1.js
@@ -201,8 +201,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 // Only equality operators are allowed with unknown
diff --git a/tests/baselines/reference/unusedLocalsAndObjectSpread.js b/tests/baselines/reference/unusedLocalsAndObjectSpread.js
index c9329f369d122..8eea55ca1f820 100644
--- a/tests/baselines/reference/unusedLocalsAndObjectSpread.js
+++ b/tests/baselines/reference/unusedLocalsAndObjectSpread.js
@@ -36,8 +36,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 function one() {
diff --git a/tests/baselines/reference/unusedLocalsAndObjectSpread2.js b/tests/baselines/reference/unusedLocalsAndObjectSpread2.js
index 39061c7431cd5..b2be424b14677 100644
--- a/tests/baselines/reference/unusedLocalsAndObjectSpread2.js
+++ b/tests/baselines/reference/unusedLocalsAndObjectSpread2.js
@@ -23,8 +23,10 @@ var __rest = (this && this.__rest) || function (s, e) {
     for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
     if (s != null && typeof Object.getOwnPropertySymbols === "function")
-        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
-            t[p[i]] = s[p[i]];
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable(p[i]))
+                t[p[i]] = s[p[i]];
+        }
     return t;
 };
 exports.__esModule = true;