diff --git a/src/compiler/transformers/es2017.ts b/src/compiler/transformers/es2017.ts
index 14f840f2e66..c87dbe32518 100644
--- a/src/compiler/transformers/es2017.ts
+++ b/src/compiler/transformers/es2017.ts
@@ -494,7 +494,7 @@ namespace ts {
                     function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
                     function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
                     function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-                    step((generator = generator.apply(thisArg, _arguments)).next());
+                    step((generator = generator.apply(thisArg, _arguments || [])).next());
                 });
             };`
     };
diff --git a/tests/baselines/reference/asyncAwaitIsolatedModules_es5.js b/tests/baselines/reference/asyncAwaitIsolatedModules_es5.js
index 2f11dddf7de..49404267009 100644
--- a/tests/baselines/reference/asyncAwaitIsolatedModules_es5.js
+++ b/tests/baselines/reference/asyncAwaitIsolatedModules_es5.js
@@ -46,7 +46,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/asyncAwaitIsolatedModules_es6.js b/tests/baselines/reference/asyncAwaitIsolatedModules_es6.js
index 98d11d72bfb..046b74e6569 100644
--- a/tests/baselines/reference/asyncAwaitIsolatedModules_es6.js
+++ b/tests/baselines/reference/asyncAwaitIsolatedModules_es6.js
@@ -45,7 +45,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function f0() {
diff --git a/tests/baselines/reference/asyncAwait_es5.js b/tests/baselines/reference/asyncAwait_es5.js
index 043e68abeab..e4dc62ea1cf 100644
--- a/tests/baselines/reference/asyncAwait_es5.js
+++ b/tests/baselines/reference/asyncAwait_es5.js
@@ -45,7 +45,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/asyncAwait_es6.js b/tests/baselines/reference/asyncAwait_es6.js
index 4ba9e096e10..d6635098aed 100644
--- a/tests/baselines/reference/asyncAwait_es6.js
+++ b/tests/baselines/reference/asyncAwait_es6.js
@@ -45,7 +45,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function f0() {
diff --git a/tests/baselines/reference/asyncFunctionNoReturnType.js b/tests/baselines/reference/asyncFunctionNoReturnType.js
index fd39fc74d0e..b1c55416566 100644
--- a/tests/baselines/reference/asyncFunctionNoReturnType.js
+++ b/tests/baselines/reference/asyncFunctionNoReturnType.js
@@ -11,7 +11,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/asyncFunctionReturnType.js b/tests/baselines/reference/asyncFunctionReturnType.js
index 76f9952ab9f..dcdead47c6b 100644
--- a/tests/baselines/reference/asyncFunctionReturnType.js
+++ b/tests/baselines/reference/asyncFunctionReturnType.js
@@ -16,7 +16,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function fAsync() {
diff --git a/tests/baselines/reference/asyncFunctionsAcrossFiles.js b/tests/baselines/reference/asyncFunctionsAcrossFiles.js
index e9b5710dc07..b1a766e4e41 100644
--- a/tests/baselines/reference/asyncFunctionsAcrossFiles.js
+++ b/tests/baselines/reference/asyncFunctionsAcrossFiles.js
@@ -21,7 +21,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 import { a } from './a';
@@ -36,7 +36,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 import { b } from './b';
diff --git a/tests/baselines/reference/asyncFunctionsAndStrictNullChecks.js b/tests/baselines/reference/asyncFunctionsAndStrictNullChecks.js
index ac9a558a53f..50ecbbb2beb 100644
--- a/tests/baselines/reference/asyncFunctionsAndStrictNullChecks.js
+++ b/tests/baselines/reference/asyncFunctionsAndStrictNullChecks.js
@@ -32,7 +32,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function sample(promise) {
diff --git a/tests/baselines/reference/asyncIIFE.js b/tests/baselines/reference/asyncIIFE.js
index 79779af62f3..2460dbdf26b 100644
--- a/tests/baselines/reference/asyncIIFE.js
+++ b/tests/baselines/reference/asyncIIFE.js
@@ -16,7 +16,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function f1() {
diff --git a/tests/baselines/reference/asyncImportedPromise_es5.js b/tests/baselines/reference/asyncImportedPromise_es5.js
index e5c28eb2dc1..641b8e0381f 100644
--- a/tests/baselines/reference/asyncImportedPromise_es5.js
+++ b/tests/baselines/reference/asyncImportedPromise_es5.js
@@ -31,7 +31,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/asyncImportedPromise_es6.js b/tests/baselines/reference/asyncImportedPromise_es6.js
index 17c9de51ee6..6c6e34e7b1d 100644
--- a/tests/baselines/reference/asyncImportedPromise_es6.js
+++ b/tests/baselines/reference/asyncImportedPromise_es6.js
@@ -21,7 +21,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 class Test {
diff --git a/tests/baselines/reference/asyncMultiFile_es5.js b/tests/baselines/reference/asyncMultiFile_es5.js
index 6b44f5393fc..547135e5c19 100644
--- a/tests/baselines/reference/asyncMultiFile_es5.js
+++ b/tests/baselines/reference/asyncMultiFile_es5.js
@@ -11,7 +11,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/asyncMultiFile_es6.js b/tests/baselines/reference/asyncMultiFile_es6.js
index 0c45aa6c8a3..e7dd854b95b 100644
--- a/tests/baselines/reference/asyncMultiFile_es6.js
+++ b/tests/baselines/reference/asyncMultiFile_es6.js
@@ -11,7 +11,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function f() {
diff --git a/tests/baselines/reference/await_unaryExpression_es6.js b/tests/baselines/reference/await_unaryExpression_es6.js
index 6609cc6f3f4..f9183f7af3e 100644
--- a/tests/baselines/reference/await_unaryExpression_es6.js
+++ b/tests/baselines/reference/await_unaryExpression_es6.js
@@ -22,7 +22,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function bar() {
diff --git a/tests/baselines/reference/await_unaryExpression_es6_1.js b/tests/baselines/reference/await_unaryExpression_es6_1.js
index 48f50d76f4a..948e537cb01 100644
--- a/tests/baselines/reference/await_unaryExpression_es6_1.js
+++ b/tests/baselines/reference/await_unaryExpression_es6_1.js
@@ -26,7 +26,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function bar() {
diff --git a/tests/baselines/reference/await_unaryExpression_es6_2.js b/tests/baselines/reference/await_unaryExpression_es6_2.js
index 5e9d63a21d2..4b4c1cd6513 100644
--- a/tests/baselines/reference/await_unaryExpression_es6_2.js
+++ b/tests/baselines/reference/await_unaryExpression_es6_2.js
@@ -18,7 +18,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function bar1() {
diff --git a/tests/baselines/reference/await_unaryExpression_es6_3.js b/tests/baselines/reference/await_unaryExpression_es6_3.js
index 469c8ea3ee9..6db5d5a7c31 100644
--- a/tests/baselines/reference/await_unaryExpression_es6_3.js
+++ b/tests/baselines/reference/await_unaryExpression_es6_3.js
@@ -24,7 +24,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function bar1() {
diff --git a/tests/baselines/reference/castOfAwait.js b/tests/baselines/reference/castOfAwait.js
index 1f66d49e0f3..9f67f74b11b 100644
--- a/tests/baselines/reference/castOfAwait.js
+++ b/tests/baselines/reference/castOfAwait.js
@@ -14,7 +14,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function f() {
diff --git a/tests/baselines/reference/declarationEmitPromise.js b/tests/baselines/reference/declarationEmitPromise.js
index e6f3f922b46..9e820a789c9 100644
--- a/tests/baselines/reference/declarationEmitPromise.js
+++ b/tests/baselines/reference/declarationEmitPromise.js
@@ -29,7 +29,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 class bluebird {
diff --git a/tests/baselines/reference/decoratorMetadataPromise.js b/tests/baselines/reference/decoratorMetadataPromise.js
index 52449f91755..23491449dfa 100644
--- a/tests/baselines/reference/decoratorMetadataPromise.js
+++ b/tests/baselines/reference/decoratorMetadataPromise.js
@@ -27,7 +27,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 class A {
diff --git a/tests/baselines/reference/defaultExportInAwaitExpression01.js b/tests/baselines/reference/defaultExportInAwaitExpression01.js
index a16e2f07f5f..9a122ae99c5 100644
--- a/tests/baselines/reference/defaultExportInAwaitExpression01.js
+++ b/tests/baselines/reference/defaultExportInAwaitExpression01.js
@@ -32,7 +32,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 (function (dependencies, factory) {
diff --git a/tests/baselines/reference/defaultExportInAwaitExpression02.js b/tests/baselines/reference/defaultExportInAwaitExpression02.js
index db05d62a2ad..8499164f675 100644
--- a/tests/baselines/reference/defaultExportInAwaitExpression02.js
+++ b/tests/baselines/reference/defaultExportInAwaitExpression02.js
@@ -24,7 +24,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 const a_1 = require("./a");
diff --git a/tests/baselines/reference/es5-asyncFunction.js b/tests/baselines/reference/es5-asyncFunction.js
index 5123566dc8c..6f04c7ed7ef 100644
--- a/tests/baselines/reference/es5-asyncFunction.js
+++ b/tests/baselines/reference/es5-asyncFunction.js
@@ -14,7 +14,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/es5-importHelpersAsyncFunctions.js b/tests/baselines/reference/es5-importHelpersAsyncFunctions.js
index 0fd308cee3b..71c4af8d559 100644
--- a/tests/baselines/reference/es5-importHelpersAsyncFunctions.js
+++ b/tests/baselines/reference/es5-importHelpersAsyncFunctions.js
@@ -34,7 +34,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {
diff --git a/tests/baselines/reference/exportDefaultAsyncFunction.js b/tests/baselines/reference/exportDefaultAsyncFunction.js
index 22f686b6ec8..9931d1f1eea 100644
--- a/tests/baselines/reference/exportDefaultAsyncFunction.js
+++ b/tests/baselines/reference/exportDefaultAsyncFunction.js
@@ -9,7 +9,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 export default function foo() {
diff --git a/tests/baselines/reference/exportDefaultAsyncFunction2.js b/tests/baselines/reference/exportDefaultAsyncFunction2.js
index aed6eb6c879..7b79bed9408 100644
--- a/tests/baselines/reference/exportDefaultAsyncFunction2.js
+++ b/tests/baselines/reference/exportDefaultAsyncFunction2.js
@@ -40,7 +40,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 export default () => __awaiter(this, void 0, void 0, function* () { return 0; });
diff --git a/tests/baselines/reference/inferenceLimit.js b/tests/baselines/reference/inferenceLimit.js
index b9423ebd655..84f0989e987 100644
--- a/tests/baselines/reference/inferenceLimit.js
+++ b/tests/baselines/reference/inferenceLimit.js
@@ -49,7 +49,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 class BrokenClass {
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.js b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.js
index 180b53028ff..b83efdce890 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.js
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.js
@@ -87,7 +87,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 // Using Es6 array
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.js b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.js
index cf69f260223..32d7135916b 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.js
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.js
@@ -87,7 +87,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 // Using Es6 array
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.js b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.js
index 350113ec6a0..d0de3c93da0 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.js
+++ b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.js
@@ -87,7 +87,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 // Using Es6 array
diff --git a/tests/baselines/reference/noImplicitReturnsInAsync1.js b/tests/baselines/reference/noImplicitReturnsInAsync1.js
index 5274264a6b1..5ab86a91d3b 100644
--- a/tests/baselines/reference/noImplicitReturnsInAsync1.js
+++ b/tests/baselines/reference/noImplicitReturnsInAsync1.js
@@ -13,7 +13,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function test(isError = false) {
diff --git a/tests/baselines/reference/noImplicitReturnsInAsync2.js b/tests/baselines/reference/noImplicitReturnsInAsync2.js
index 93f8c97d1fb..7e7f22bd691 100644
--- a/tests/baselines/reference/noImplicitReturnsInAsync2.js
+++ b/tests/baselines/reference/noImplicitReturnsInAsync2.js
@@ -42,7 +42,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 // Should be an error, Promise<number>, currently retorted correctly 
diff --git a/tests/baselines/reference/objectRest2.js b/tests/baselines/reference/objectRest2.js
index e21c8c79853..6abff9e56a1 100644
--- a/tests/baselines/reference/objectRest2.js
+++ b/tests/baselines/reference/objectRest2.js
@@ -28,7 +28,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 function rootConnection(name) {
diff --git a/tests/baselines/reference/promiseType.js b/tests/baselines/reference/promiseType.js
index 9fbdb2ab2b6..4e42ea24073 100644
--- a/tests/baselines/reference/promiseType.js
+++ b/tests/baselines/reference/promiseType.js
@@ -161,7 +161,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 const a = p.then();
diff --git a/tests/baselines/reference/promiseTypeStrictNull.js b/tests/baselines/reference/promiseTypeStrictNull.js
index 8c5cef4c7c4..4aefeb3403e 100644
--- a/tests/baselines/reference/promiseTypeStrictNull.js
+++ b/tests/baselines/reference/promiseTypeStrictNull.js
@@ -161,7 +161,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 const a = p.then();
diff --git a/tests/baselines/reference/reachabilityChecks7.js b/tests/baselines/reference/reachabilityChecks7.js
index b8334f4276b..c17472205a4 100644
--- a/tests/baselines/reference/reachabilityChecks7.js
+++ b/tests/baselines/reference/reachabilityChecks7.js
@@ -36,7 +36,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 // async function without return type annotation - error
diff --git a/tests/baselines/reference/transformNestedGeneratorsWithTry.js b/tests/baselines/reference/transformNestedGeneratorsWithTry.js
index 69273e62633..7c3597ddc4b 100644
--- a/tests/baselines/reference/transformNestedGeneratorsWithTry.js
+++ b/tests/baselines/reference/transformNestedGeneratorsWithTry.js
@@ -29,7 +29,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
         function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
         function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments)).next());
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
 var __generator = (this && this.__generator) || function (thisArg, body) {