diff --git a/lib/tsc.js b/lib/tsc.js
index dbfdc1cac0475..3c2286041f7d9 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -21922,7 +21922,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     ts.valuesHelper = {
         name: "typescript:values",
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 75b1593464a10..ac49ace7bdcd0 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -22,7 +22,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var __assign = (this && this.__assign) || function () {
     __assign = Object.assign || function(t) {
@@ -27228,7 +27228,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     // ES2015 Destructuring Helpers
     ts.valuesHelper = {
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index 2841c88fd57b3..47d329d5e07e2 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -21,7 +21,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var __assign = (this && this.__assign) || function () {
     __assign = Object.assign || function(t) {
@@ -27422,7 +27422,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     // ES2015 Destructuring Helpers
     ts.valuesHelper = {
diff --git a/lib/typescript.js b/lib/typescript.js
index a017a2df83c17..0f28c735443c2 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -27422,7 +27422,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     // ES2015 Destructuring Helpers
     ts.valuesHelper = {
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index caea5c94199f5..9f7987c8c3322 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -27422,7 +27422,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     // ES2015 Destructuring Helpers
     ts.valuesHelper = {
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index d0c28ce72dd57..3cab1d13f239d 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -27217,7 +27217,7 @@ var ts;
         name: "typescript:spreadArray",
         importName: "__spreadArray",
         scoped: false,
-        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || from);\n            };"
+        text: "\n            var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {\n                if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {\n                    if (ar || !(i in from)) {\n                        if (!ar) ar = Array.prototype.slice.call(from, 0, i);\n                        ar[i] = from[i];\n                    }\n                }\n                return to.concat(ar || Array.prototype.slice.call(from));\n            };"
     };
     // ES2015 Destructuring Helpers
     ts.valuesHelper = {