diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index da10144d679ad..1272cbc53a90d 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -673,7 +673,7 @@ namespace ts {
                             /*type*/ undefined,
                             iife
                         )
-                    ], languageVersion > ScriptTarget.ES5 ? NodeFlags.Let : undefined)
+                    ], languageVersion > ScriptTarget.ES5 ? NodeFlags.Const : undefined)
                 );
 
                 setOriginalNode(varStatement, node);
diff --git a/tests/baselines/reference/awaitAndYieldInProperty.js b/tests/baselines/reference/awaitAndYieldInProperty.js
index 238666278a8f1..1be0d297bb989 100644
--- a/tests/baselines/reference/awaitAndYieldInProperty.js
+++ b/tests/baselines/reference/awaitAndYieldInProperty.js
@@ -20,7 +20,7 @@ async function* test(x: Promise<string>) {
 //// [awaitAndYieldInProperty.js]
 async function* test(x) {
     var _a, _b, _c, _d, _e;
-    let C = /** @class */ (() => {
+    const C = /** @class */ (() => {
         var _e, _f, _g, _h;
         class C {
             constructor() {
diff --git a/tests/baselines/reference/classDeclarationCheckUsedBeforeDefinitionInItself.js b/tests/baselines/reference/classDeclarationCheckUsedBeforeDefinitionInItself.js
index 0d5cc7e784553..347054aa347a9 100644
--- a/tests/baselines/reference/classDeclarationCheckUsedBeforeDefinitionInItself.js
+++ b/tests/baselines/reference/classDeclarationCheckUsedBeforeDefinitionInItself.js
@@ -4,7 +4,7 @@ class C3 {
 }
 
 //// [classDeclarationCheckUsedBeforeDefinitionInItself.js]
-let C3 = /** @class */ (() => {
+const C3 = /** @class */ (() => {
     class C3 {
     }
     C3.intance = new C3(); // ok
diff --git a/tests/baselines/reference/computedPropertyNames12_ES6.js b/tests/baselines/reference/computedPropertyNames12_ES6.js
index 9a0e26d1e24f3..7be7ee2313b29 100644
--- a/tests/baselines/reference/computedPropertyNames12_ES6.js
+++ b/tests/baselines/reference/computedPropertyNames12_ES6.js
@@ -20,7 +20,7 @@ class C {
 var s;
 var n;
 var a;
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     var _a, _b, _c;
     class C {
         constructor() {
diff --git a/tests/baselines/reference/computedPropertyNamesWithStaticProperty.js b/tests/baselines/reference/computedPropertyNamesWithStaticProperty.js
index fcff09585fbfe..83481347b43e1 100644
--- a/tests/baselines/reference/computedPropertyNamesWithStaticProperty.js
+++ b/tests/baselines/reference/computedPropertyNamesWithStaticProperty.js
@@ -11,7 +11,7 @@ class C {
 }
 
 //// [computedPropertyNamesWithStaticProperty.js]
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         get [C.staticProp]() {
             return "hello";
diff --git a/tests/baselines/reference/decoratedClassExportsCommonJS1.js b/tests/baselines/reference/decoratedClassExportsCommonJS1.js
index 3b8d6507b4fcb..d537217f8bdba 100644
--- a/tests/baselines/reference/decoratedClassExportsCommonJS1.js
+++ b/tests/baselines/reference/decoratedClassExportsCommonJS1.js
@@ -15,7 +15,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-let Testing123 = /** @class */ (() => {
+const Testing123 = /** @class */ (() => {
     var Testing123_1;
     let Testing123 = Testing123_1 = class Testing123 {
     };
diff --git a/tests/baselines/reference/decoratedClassExportsCommonJS2.js b/tests/baselines/reference/decoratedClassExportsCommonJS2.js
index 5af634a7b9dc1..05be638f93b5e 100644
--- a/tests/baselines/reference/decoratedClassExportsCommonJS2.js
+++ b/tests/baselines/reference/decoratedClassExportsCommonJS2.js
@@ -13,7 +13,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-let Testing123 = /** @class */ (() => {
+const Testing123 = /** @class */ (() => {
     var Testing123_1;
     let Testing123 = Testing123_1 = class Testing123 {
     };
diff --git a/tests/baselines/reference/decoratedClassFromExternalModule.js b/tests/baselines/reference/decoratedClassFromExternalModule.js
index a4ae38133b89a..9bce0de4dd491 100644
--- a/tests/baselines/reference/decoratedClassFromExternalModule.js
+++ b/tests/baselines/reference/decoratedClassFromExternalModule.js
@@ -17,7 +17,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 function decorate(target) { }
-let Decorated = /** @class */ (() => {
+const Decorated = /** @class */ (() => {
     let Decorated = class Decorated {
     };
     Decorated = __decorate([
diff --git a/tests/baselines/reference/decoratedDefaultExportsGetExportedAmd.js b/tests/baselines/reference/decoratedDefaultExportsGetExportedAmd.js
index 5772bdade2003..fa1d60e5b59cd 100644
--- a/tests/baselines/reference/decoratedDefaultExportsGetExportedAmd.js
+++ b/tests/baselines/reference/decoratedDefaultExportsGetExportedAmd.js
@@ -24,7 +24,7 @@ define(["require", "exports"], function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let Foo = /** @class */ (() => {
+    const Foo = /** @class */ (() => {
         let Foo = class Foo {
         };
         Foo = __decorate([
@@ -45,7 +45,7 @@ define(["require", "exports"], function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let default_1 = /** @class */ (() => {
+    const default_1 = /** @class */ (() => {
         let default_1 = class {
         };
         default_1 = __decorate([
diff --git a/tests/baselines/reference/decoratedDefaultExportsGetExportedCommonjs.js b/tests/baselines/reference/decoratedDefaultExportsGetExportedCommonjs.js
index 51a3144eb91f2..bf7bf3170dabc 100644
--- a/tests/baselines/reference/decoratedDefaultExportsGetExportedCommonjs.js
+++ b/tests/baselines/reference/decoratedDefaultExportsGetExportedCommonjs.js
@@ -23,7 +23,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 var decorator;
-let Foo = /** @class */ (() => {
+const Foo = /** @class */ (() => {
     let Foo = class Foo {
     };
     Foo = __decorate([
@@ -42,7 +42,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 var decorator;
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     let default_1 = class {
     };
     default_1 = __decorate([
diff --git a/tests/baselines/reference/decoratedDefaultExportsGetExportedUmd.js b/tests/baselines/reference/decoratedDefaultExportsGetExportedUmd.js
index f8c2160559e40..48dd01c3fbf14 100644
--- a/tests/baselines/reference/decoratedDefaultExportsGetExportedUmd.js
+++ b/tests/baselines/reference/decoratedDefaultExportsGetExportedUmd.js
@@ -32,7 +32,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let Foo = /** @class */ (() => {
+    const Foo = /** @class */ (() => {
         let Foo = class Foo {
         };
         Foo = __decorate([
@@ -61,7 +61,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let default_1 = /** @class */ (() => {
+    const default_1 = /** @class */ (() => {
         let default_1 = class {
         };
         default_1 = __decorate([
diff --git a/tests/baselines/reference/decoratorMetadataPromise.js b/tests/baselines/reference/decoratorMetadataPromise.js
index d724e048afda0..b20a3d18e068a 100644
--- a/tests/baselines/reference/decoratorMetadataPromise.js
+++ b/tests/baselines/reference/decoratorMetadataPromise.js
@@ -30,7 +30,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     class A {
         foo() {
             return __awaiter(this, void 0, void 0, function* () { });
diff --git a/tests/baselines/reference/decoratorOnClass1.es6.js b/tests/baselines/reference/decoratorOnClass1.es6.js
index 6e2f74e995780..2a313e39f4e7f 100644
--- a/tests/baselines/reference/decoratorOnClass1.es6.js
+++ b/tests/baselines/reference/decoratorOnClass1.es6.js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     let C = class C {
     };
     C = __decorate([
diff --git a/tests/baselines/reference/decoratorOnClass2.es6.js b/tests/baselines/reference/decoratorOnClass2.es6.js
index 6946945df6267..79b8a0eabe26b 100644
--- a/tests/baselines/reference/decoratorOnClass2.es6.js
+++ b/tests/baselines/reference/decoratorOnClass2.es6.js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     let C = class C {
     };
     C = __decorate([
diff --git a/tests/baselines/reference/decoratorOnClass3.es6.js b/tests/baselines/reference/decoratorOnClass3.es6.js
index 4cdfc3e6865de..7f86ee49d1fc8 100644
--- a/tests/baselines/reference/decoratorOnClass3.es6.js
+++ b/tests/baselines/reference/decoratorOnClass3.es6.js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     let C = class C {
     };
     C = __decorate([
diff --git a/tests/baselines/reference/decoratorOnClass4.es6.js b/tests/baselines/reference/decoratorOnClass4.es6.js
index 915f91f8721b0..b6963270e9fc3 100644
--- a/tests/baselines/reference/decoratorOnClass4.es6.js
+++ b/tests/baselines/reference/decoratorOnClass4.es6.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     let default_1 = class {
     };
     default_1 = __decorate([
diff --git a/tests/baselines/reference/decoratorOnClass5.es6.js b/tests/baselines/reference/decoratorOnClass5.es6.js
index 0c9fa643ebe03..6330c41d2b76d 100644
--- a/tests/baselines/reference/decoratorOnClass5.es6.js
+++ b/tests/baselines/reference/decoratorOnClass5.es6.js
@@ -16,7 +16,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     var C_1;
     let C = C_1 = class C {
         static x() { return C_1.y; }
diff --git a/tests/baselines/reference/decoratorOnClass6.es6.js b/tests/baselines/reference/decoratorOnClass6.es6.js
index e54247c0246c3..eb674f058aed8 100644
--- a/tests/baselines/reference/decoratorOnClass6.es6.js
+++ b/tests/baselines/reference/decoratorOnClass6.es6.js
@@ -16,7 +16,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     var C_1;
     let C = C_1 = class C {
         static x() { return C_1.y; }
diff --git a/tests/baselines/reference/decoratorOnClass7.es6.js b/tests/baselines/reference/decoratorOnClass7.es6.js
index 105ce5f5ef35e..484697d7a9b1d 100644
--- a/tests/baselines/reference/decoratorOnClass7.es6.js
+++ b/tests/baselines/reference/decoratorOnClass7.es6.js
@@ -16,7 +16,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     var C_1;
     let C = C_1 = class C {
         static x() { return C_1.y; }
diff --git a/tests/baselines/reference/decoratorOnClass8.es6.js b/tests/baselines/reference/decoratorOnClass8.es6.js
index 7b91f4d266b24..1d291fe920ad5 100644
--- a/tests/baselines/reference/decoratorOnClass8.es6.js
+++ b/tests/baselines/reference/decoratorOnClass8.es6.js
@@ -13,7 +13,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     let default_1 = class default_1 {
     };
     default_1.y = 1;
diff --git a/tests/baselines/reference/decoratorOnClassAccessor1.es6.js b/tests/baselines/reference/decoratorOnClassAccessor1.es6.js
index 6b010f8a1b033..16d2632342f4d 100644
--- a/tests/baselines/reference/decoratorOnClassAccessor1.es6.js
+++ b/tests/baselines/reference/decoratorOnClassAccessor1.es6.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     class default_1 {
         get accessor() { return 1; }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethod1.es6.js b/tests/baselines/reference/decoratorOnClassMethod1.es6.js
index ffdac44708e6d..e416c5ed21996 100644
--- a/tests/baselines/reference/decoratorOnClassMethod1.es6.js
+++ b/tests/baselines/reference/decoratorOnClassMethod1.es6.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     class default_1 {
         method() { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethod13.js b/tests/baselines/reference/decoratorOnClassMethod13.js
index 9bc4d1e45ab57..b9766fac9d3ca 100644
--- a/tests/baselines/reference/decoratorOnClassMethod13.js
+++ b/tests/baselines/reference/decoratorOnClassMethod13.js
@@ -13,7 +13,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         ["1"]() { }
         ["b"]() { }
diff --git a/tests/baselines/reference/decoratorOnClassMethod4.js b/tests/baselines/reference/decoratorOnClassMethod4.js
index f719fb309931a..a324ca34ec9c0 100644
--- a/tests/baselines/reference/decoratorOnClassMethod4.js
+++ b/tests/baselines/reference/decoratorOnClassMethod4.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         ["method"]() { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethod5.js b/tests/baselines/reference/decoratorOnClassMethod5.js
index d3985ad6904e4..b870b287b838b 100644
--- a/tests/baselines/reference/decoratorOnClassMethod5.js
+++ b/tests/baselines/reference/decoratorOnClassMethod5.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         ["method"]() { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethod6.js b/tests/baselines/reference/decoratorOnClassMethod6.js
index a436f1a7ec95e..d72030ae43556 100644
--- a/tests/baselines/reference/decoratorOnClassMethod6.js
+++ b/tests/baselines/reference/decoratorOnClassMethod6.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         ["method"]() { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethod7.js b/tests/baselines/reference/decoratorOnClassMethod7.js
index 0777661051512..9d99b26bcc6a7 100644
--- a/tests/baselines/reference/decoratorOnClassMethod7.js
+++ b/tests/baselines/reference/decoratorOnClassMethod7.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         ["method"]() { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassMethodParameter1.es6.js b/tests/baselines/reference/decoratorOnClassMethodParameter1.es6.js
index 9d249d8bdf304..bfd5ce04d4763 100644
--- a/tests/baselines/reference/decoratorOnClassMethodParameter1.es6.js
+++ b/tests/baselines/reference/decoratorOnClassMethodParameter1.es6.js
@@ -15,7 +15,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 var __param = (this && this.__param) || function (paramIndex, decorator) {
     return function (target, key) { decorator(target, key, paramIndex); }
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     class default_1 {
         method(p) { }
     }
diff --git a/tests/baselines/reference/decoratorOnClassProperty1.es6.js b/tests/baselines/reference/decoratorOnClassProperty1.es6.js
index 17ef5044de986..e5572c70edd3e 100644
--- a/tests/baselines/reference/decoratorOnClassProperty1.es6.js
+++ b/tests/baselines/reference/decoratorOnClassProperty1.es6.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     class default_1 {
     }
     __decorate([
diff --git a/tests/baselines/reference/decoratorsOnComputedProperties.js b/tests/baselines/reference/decoratorsOnComputedProperties.js
index cdaead9ec259f..9969cca2430b5 100644
--- a/tests/baselines/reference/decoratorsOnComputedProperties.js
+++ b/tests/baselines/reference/decoratorsOnComputedProperties.js
@@ -204,7 +204,7 @@ function foo() { return ++i + ""; }
 const fieldNameA = "fieldName1";
 const fieldNameB = "fieldName2";
 const fieldNameC = "fieldName3";
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     var _a, _b, _c, _d;
     class A {
         constructor() {
@@ -259,7 +259,7 @@ void (_a = class B {
     _g = fieldNameB,
     _h = fieldNameC,
     _a);
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     var _a, _b, _c, _d;
     class C {
         constructor() {
@@ -309,7 +309,7 @@ void class D {
     }
     [(foo(), _j = foo(), _k = foo(), _l = fieldNameB, _m = fieldNameC, "some" + "method")]() { }
 };
-let E = /** @class */ (() => {
+const E = /** @class */ (() => {
     var _a, _b, _c, _d;
     class E {
         constructor() {
@@ -363,7 +363,7 @@ void (_b = class F {
     _q = fieldNameB,
     _r = fieldNameC,
     _b);
-let G = /** @class */ (() => {
+const G = /** @class */ (() => {
     var _a, _b, _c, _d;
     class G {
         constructor() {
@@ -418,7 +418,7 @@ void (_c = class H {
     },
     _v = fieldNameC,
     _c);
-let I = /** @class */ (() => {
+const I = /** @class */ (() => {
     var _a, _b, _c, _d, _e;
     class I {
         constructor() {
diff --git a/tests/baselines/reference/emitClassDeclarationWithLiteralPropertyNameInES6.js b/tests/baselines/reference/emitClassDeclarationWithLiteralPropertyNameInES6.js
index 337dc8d03f743..135c7a729c799 100644
--- a/tests/baselines/reference/emitClassDeclarationWithLiteralPropertyNameInES6.js
+++ b/tests/baselines/reference/emitClassDeclarationWithLiteralPropertyNameInES6.js
@@ -15,7 +15,7 @@ class B {
 }
 
 //// [emitClassDeclarationWithLiteralPropertyNameInES6.js]
-let B = /** @class */ (() => {
+const B = /** @class */ (() => {
     class B {
         constructor() {
             this["hello"] = 10;
diff --git a/tests/baselines/reference/emitClassDeclarationWithStaticPropertyAssignmentInES6.js b/tests/baselines/reference/emitClassDeclarationWithStaticPropertyAssignmentInES6.js
index 7d0b9e7e95c86..29f77cb4b9e4f 100644
--- a/tests/baselines/reference/emitClassDeclarationWithStaticPropertyAssignmentInES6.js
+++ b/tests/baselines/reference/emitClassDeclarationWithStaticPropertyAssignmentInES6.js
@@ -10,13 +10,13 @@ class D {
 
 
 //// [emitClassDeclarationWithStaticPropertyAssignmentInES6.js]
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
     }
     C.z = "Foo";
     return C;
 })();
-let D = /** @class */ (() => {
+const D = /** @class */ (() => {
     class D {
         constructor() {
             this.x = 20000;
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=amd).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=amd).js
index 69f5522723f07..5448443c9fdb1 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=amd).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=amd).js
@@ -17,7 +17,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 define(["require", "exports"], function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
-    let A = /** @class */ (() => {
+    const A = /** @class */ (() => {
         let A = class A {
         };
         A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=commonjs).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=commonjs).js
index 09dacd74722f5..23c16638f7c6d 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=commonjs).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=commonjs).js
@@ -16,7 +16,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es2020).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es2020).js
index a8e82719015ea..7733aaf50295e 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es2020).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es2020).js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es6).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es6).js
index a8e82719015ea..7733aaf50295e 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es6).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=es6).js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=esnext).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=esnext).js
index a8e82719015ea..7733aaf50295e 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=esnext).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=esnext).js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=none).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=none).js
index 09dacd74722f5..23c16638f7c6d 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=none).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=none).js
@@ -16,7 +16,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=umd).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=umd).js
index 3014bd421f450..58c293f53ff43 100644
--- a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=umd).js
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=umd).js
@@ -25,7 +25,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 })(function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
-    let A = /** @class */ (() => {
+    const A = /** @class */ (() => {
         let A = class A {
         };
         A = __decorate([
diff --git a/tests/baselines/reference/es6ModuleClassDeclaration.js b/tests/baselines/reference/es6ModuleClassDeclaration.js
index d0dbc29e7daa1..e5d4b1a3f52e7 100644
--- a/tests/baselines/reference/es6ModuleClassDeclaration.js
+++ b/tests/baselines/reference/es6ModuleClassDeclaration.js
@@ -113,7 +113,7 @@ module m2 {
 }
 
 //// [es6ModuleClassDeclaration.js]
-let c = /** @class */ (() => {
+const c = /** @class */ (() => {
     class c {
         constructor() {
             this.x = 10;
@@ -133,7 +133,7 @@ let c = /** @class */ (() => {
     return c;
 })();
 export { c };
-let c2 = /** @class */ (() => {
+const c2 = /** @class */ (() => {
     class c2 {
         constructor() {
             this.x = 10;
@@ -156,7 +156,7 @@ new c();
 new c2();
 export var m1;
 (function (m1) {
-    let c3 = /** @class */ (() => {
+    const c3 = /** @class */ (() => {
         class c3 {
             constructor() {
                 this.x = 10;
@@ -176,7 +176,7 @@ export var m1;
         return c3;
     })();
     m1.c3 = c3;
-    let c4 = /** @class */ (() => {
+    const c4 = /** @class */ (() => {
         class c4 {
             constructor() {
                 this.x = 10;
@@ -202,7 +202,7 @@ export var m1;
 })(m1 || (m1 = {}));
 var m2;
 (function (m2) {
-    let c3 = /** @class */ (() => {
+    const c3 = /** @class */ (() => {
         class c3 {
             constructor() {
                 this.x = 10;
@@ -222,7 +222,7 @@ var m2;
         return c3;
     })();
     m2.c3 = c3;
-    let c4 = /** @class */ (() => {
+    const c4 = /** @class */ (() => {
         class c4 {
             constructor() {
                 this.x = 10;
diff --git a/tests/baselines/reference/exportDefaultClassWithStaticPropertyAssignmentsInES6.js b/tests/baselines/reference/exportDefaultClassWithStaticPropertyAssignmentsInES6.js
index 6e0bdb295a168..bf4b3cfa31434 100644
--- a/tests/baselines/reference/exportDefaultClassWithStaticPropertyAssignmentsInES6.js
+++ b/tests/baselines/reference/exportDefaultClassWithStaticPropertyAssignmentsInES6.js
@@ -4,7 +4,7 @@ export default class {
 }
 
 //// [exportDefaultClassWithStaticPropertyAssignmentsInES6.js]
-let default_1 = /** @class */ (() => {
+const default_1 = /** @class */ (() => {
     class default_1 {
     }
     default_1.z = "Foo";
diff --git a/tests/baselines/reference/generatorTypeCheck39.js b/tests/baselines/reference/generatorTypeCheck39.js
index 73b1416c82f3f..4da3470e419b5 100644
--- a/tests/baselines/reference/generatorTypeCheck39.js
+++ b/tests/baselines/reference/generatorTypeCheck39.js
@@ -20,7 +20,7 @@ function decorator(x) {
     return y => { };
 }
 function* g() {
-    let C = /** @class */ (() => {
+    const C = /** @class */ (() => {
         let C = class C {
             constructor() {
                 this.x = yield 0;
diff --git a/tests/baselines/reference/generatorTypeCheck58.js b/tests/baselines/reference/generatorTypeCheck58.js
index c969eb9ba7bbf..e8ddded5319a1 100644
--- a/tests/baselines/reference/generatorTypeCheck58.js
+++ b/tests/baselines/reference/generatorTypeCheck58.js
@@ -7,7 +7,7 @@ function* g() {
 
 //// [generatorTypeCheck58.js]
 function* g() {
-    let C = /** @class */ (() => {
+    const C = /** @class */ (() => {
         class C {
         }
         C.x = yield 0;
diff --git a/tests/baselines/reference/generatorTypeCheck59.js b/tests/baselines/reference/generatorTypeCheck59.js
index 8b1dfbd777c03..24b3dd1cf1121 100644
--- a/tests/baselines/reference/generatorTypeCheck59.js
+++ b/tests/baselines/reference/generatorTypeCheck59.js
@@ -14,7 +14,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 function* g() {
-    let C = /** @class */ (() => {
+    const C = /** @class */ (() => {
         class C {
             m() { }
         }
diff --git a/tests/baselines/reference/generatorTypeCheck61.js b/tests/baselines/reference/generatorTypeCheck61.js
index bd095dd2478b5..9b0a4dbec1163 100644
--- a/tests/baselines/reference/generatorTypeCheck61.js
+++ b/tests/baselines/reference/generatorTypeCheck61.js
@@ -12,7 +12,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 function* g() {
-    let C = /** @class */ (() => {
+    const C = /** @class */ (() => {
         let C = class C {
         };
         C = __decorate([
diff --git a/tests/baselines/reference/importHelpersES6.js b/tests/baselines/reference/importHelpersES6.js
index df12fb0c0502f..63f0b231248d2 100644
--- a/tests/baselines/reference/importHelpersES6.js
+++ b/tests/baselines/reference/importHelpersES6.js
@@ -19,7 +19,7 @@ export declare function __awaiter(thisArg: any, _arguments: any, P: Function, ge
 
 //// [a.js]
 import { __decorate } from "tslib";
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate([
diff --git a/tests/baselines/reference/importHelpersWithLocalCollisions(module=amd).js b/tests/baselines/reference/importHelpersWithLocalCollisions(module=amd).js
index 74631aae213cb..f330893743748 100644
--- a/tests/baselines/reference/importHelpersWithLocalCollisions(module=amd).js
+++ b/tests/baselines/reference/importHelpersWithLocalCollisions(module=amd).js
@@ -21,7 +21,7 @@ export declare function __awaiter(thisArg: any, _arguments: any, P: Function, ge
 define(["require", "exports", "tslib"], function (require, exports, tslib_1) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
-    let A = /** @class */ (() => {
+    const A = /** @class */ (() => {
         let A = class A {
         };
         A = tslib_1.__decorate([
diff --git a/tests/baselines/reference/importHelpersWithLocalCollisions(module=commonjs).js b/tests/baselines/reference/importHelpersWithLocalCollisions(module=commonjs).js
index b201899e5c733..94bd8b70974a3 100644
--- a/tests/baselines/reference/importHelpersWithLocalCollisions(module=commonjs).js
+++ b/tests/baselines/reference/importHelpersWithLocalCollisions(module=commonjs).js
@@ -21,7 +21,7 @@ export declare function __awaiter(thisArg: any, _arguments: any, P: Function, ge
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
 const tslib_1 = require("tslib");
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = tslib_1.__decorate([
diff --git a/tests/baselines/reference/importHelpersWithLocalCollisions(module=es2015).js b/tests/baselines/reference/importHelpersWithLocalCollisions(module=es2015).js
index 0f029ca44fa87..730f5078980b5 100644
--- a/tests/baselines/reference/importHelpersWithLocalCollisions(module=es2015).js
+++ b/tests/baselines/reference/importHelpersWithLocalCollisions(module=es2015).js
@@ -19,7 +19,7 @@ export declare function __awaiter(thisArg: any, _arguments: any, P: Function, ge
 
 //// [a.js]
 import { __decorate as __decorate_1 } from "tslib";
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
     };
     A = __decorate_1([
diff --git a/tests/baselines/reference/invalidNewTarget.es6.js b/tests/baselines/reference/invalidNewTarget.es6.js
index f77704edd759d..97444efb83717 100644
--- a/tests/baselines/reference/invalidNewTarget.es6.js
+++ b/tests/baselines/reference/invalidNewTarget.es6.js
@@ -27,7 +27,7 @@ const O = {
 //// [invalidNewTarget.es6.js]
 const a = new.target;
 const b = () => new.target;
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         constructor() {
             this.f = () => new.target;
diff --git a/tests/baselines/reference/newTarget.es6.js b/tests/baselines/reference/newTarget.es6.js
index a209735d51573..c795ab217bfe6 100644
--- a/tests/baselines/reference/newTarget.es6.js
+++ b/tests/baselines/reference/newTarget.es6.js
@@ -33,7 +33,7 @@ const O = {
 
 
 //// [newTarget.es6.js]
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     class A {
         constructor() {
             this.d = function () { return new.target; };
diff --git a/tests/baselines/reference/potentiallyUncalledDecorators.js b/tests/baselines/reference/potentiallyUncalledDecorators.js
index fe46a41c41ba6..3e9c0e8d61016 100644
--- a/tests/baselines/reference/potentiallyUncalledDecorators.js
+++ b/tests/baselines/reference/potentiallyUncalledDecorators.js
@@ -85,7 +85,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-let FooComponent = /** @class */ (() => {
+const FooComponent = /** @class */ (() => {
     class FooComponent {
     }
     __decorate([
@@ -93,7 +93,7 @@ let FooComponent = /** @class */ (() => {
     ], FooComponent.prototype, "foo", void 0);
     return FooComponent;
 })();
-let Person = /** @class */ (() => {
+const Person = /** @class */ (() => {
     class Person {
     }
     __decorate([
@@ -101,7 +101,7 @@ let Person = /** @class */ (() => {
     ], Person.prototype, "person", void 0);
     return Person;
 })();
-let MultiplyByTwo = /** @class */ (() => {
+const MultiplyByTwo = /** @class */ (() => {
     class MultiplyByTwo {
         get multiplied() {
             return this.args.number * 2;
@@ -112,7 +112,7 @@ let MultiplyByTwo = /** @class */ (() => {
     ], MultiplyByTwo.prototype, "multiplied", null);
     return MultiplyByTwo;
 })();
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
         bar() { }
     };
@@ -127,7 +127,7 @@ let A = /** @class */ (() => {
     ], A);
     return A;
 })();
-let B = /** @class */ (() => {
+const B = /** @class */ (() => {
     let B = class B {
         bar() { }
     };
@@ -142,7 +142,7 @@ let B = /** @class */ (() => {
     ], B);
     return B;
 })();
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     let C = class C {
         bar() { }
     };
@@ -157,7 +157,7 @@ let C = /** @class */ (() => {
     ], C);
     return C;
 })();
-let D = /** @class */ (() => {
+const D = /** @class */ (() => {
     let D = class D {
         bar() { }
     };
@@ -172,7 +172,7 @@ let D = /** @class */ (() => {
     ], D);
     return D;
 })();
-let E = /** @class */ (() => {
+const E = /** @class */ (() => {
     let E = class E {
         bar() { }
     };
@@ -187,7 +187,7 @@ let E = /** @class */ (() => {
     ], E);
     return E;
 })();
-let F = /** @class */ (() => {
+const F = /** @class */ (() => {
     let F = class F {
         bar() { }
     };
@@ -202,7 +202,7 @@ let F = /** @class */ (() => {
     ], F);
     return F;
 })();
-let G = /** @class */ (() => {
+const G = /** @class */ (() => {
     let G = class G {
         bar() { }
     };
diff --git a/tests/baselines/reference/privateNameAndStaticInitializer(target=es2015).js b/tests/baselines/reference/privateNameAndStaticInitializer(target=es2015).js
index 0d03cc006e8c0..ad0e8cbd0af97 100644
--- a/tests/baselines/reference/privateNameAndStaticInitializer(target=es2015).js
+++ b/tests/baselines/reference/privateNameAndStaticInitializer(target=es2015).js
@@ -8,7 +8,7 @@ class A {
 
 
 //// [privateNameAndStaticInitializer.js]
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     var _foo, _prop;
     class A {
         constructor() {
diff --git a/tests/baselines/reference/privateNameAndStaticInitializer(target=esnext).js b/tests/baselines/reference/privateNameAndStaticInitializer(target=esnext).js
index b5c90411438f1..2b0ec4012088e 100644
--- a/tests/baselines/reference/privateNameAndStaticInitializer(target=esnext).js
+++ b/tests/baselines/reference/privateNameAndStaticInitializer(target=esnext).js
@@ -8,7 +8,7 @@ class A {
 
 
 //// [privateNameAndStaticInitializer.js]
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     class A {
         constructor() {
             this.#foo = 1;
diff --git a/tests/baselines/reference/privateNameFieldsESNext.js b/tests/baselines/reference/privateNameFieldsESNext.js
index dfa84989314fa..cdace16aa7e8e 100644
--- a/tests/baselines/reference/privateNameFieldsESNext.js
+++ b/tests/baselines/reference/privateNameFieldsESNext.js
@@ -21,7 +21,7 @@ class C {
 
 
 //// [privateNameFieldsESNext.js]
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         constructor() {
             this.a = 123;
diff --git a/tests/baselines/reference/privateNamesConstructorChain-1.js b/tests/baselines/reference/privateNamesConstructorChain-1.js
index 87ee524349529..83c1b42709126 100644
--- a/tests/baselines/reference/privateNamesConstructorChain-1.js
+++ b/tests/baselines/reference/privateNamesConstructorChain-1.js
@@ -22,7 +22,7 @@ var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (
     return privateMap.get(receiver);
 };
 var _foo, _bar;
-let Parent = /** @class */ (() => {
+const Parent = /** @class */ (() => {
     var _foo_1, _bar;
     class Parent {
         constructor() {
diff --git a/tests/baselines/reference/privateNamesConstructorChain-2.js b/tests/baselines/reference/privateNamesConstructorChain-2.js
index a6e6e88c65505..8698eeda31169 100644
--- a/tests/baselines/reference/privateNamesConstructorChain-2.js
+++ b/tests/baselines/reference/privateNamesConstructorChain-2.js
@@ -24,7 +24,7 @@ var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (
     return privateMap.get(receiver);
 };
 var _foo, _bar;
-let Parent = /** @class */ (() => {
+const Parent = /** @class */ (() => {
     var _foo_1, _bar;
     class Parent {
         constructor() {
diff --git a/tests/baselines/reference/privateNamesInNestedClasses-2.js b/tests/baselines/reference/privateNamesInNestedClasses-2.js
index edf6658baf426..79930b2a5329c 100644
--- a/tests/baselines/reference/privateNamesInNestedClasses-2.js
+++ b/tests/baselines/reference/privateNamesInNestedClasses-2.js
@@ -24,7 +24,7 @@ var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (
     }
     return privateMap.get(receiver);
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     var _x;
     class A {
         constructor() {
diff --git a/tests/baselines/reference/privateNamesUnique-3.js b/tests/baselines/reference/privateNamesUnique-3.js
index 2ba6381a234ec..cb8628fe20ba4 100644
--- a/tests/baselines/reference/privateNamesUnique-3.js
+++ b/tests/baselines/reference/privateNamesUnique-3.js
@@ -21,7 +21,7 @@ var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (
     }
     return privateMap.get(receiver);
 };
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     var _foo, _foo_1;
     class A {
         constructor() {
@@ -35,7 +35,7 @@ let A = /** @class */ (() => {
     _foo_1.set(A, true); // error (duplicate)
     return A;
 })();
-let B = /** @class */ (() => {
+const B = /** @class */ (() => {
     var _foo;
     class B {
         test(x) {
diff --git a/tests/baselines/reference/symbolDeclarationEmit11.js b/tests/baselines/reference/symbolDeclarationEmit11.js
index 88520763dafb8..a418788de2999 100644
--- a/tests/baselines/reference/symbolDeclarationEmit11.js
+++ b/tests/baselines/reference/symbolDeclarationEmit11.js
@@ -7,7 +7,7 @@ class C {
 }
 
 //// [symbolDeclarationEmit11.js]
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         static [Symbol.isConcatSpreadable]() { }
         static get [Symbol.toPrimitive]() { return ""; }
diff --git a/tests/baselines/reference/transformApi/transformsCorrectly.rewrittenNamespaceFollowingClass.js b/tests/baselines/reference/transformApi/transformsCorrectly.rewrittenNamespaceFollowingClass.js
index 93cf7f8788380..26c058477ea1e 100644
--- a/tests/baselines/reference/transformApi/transformsCorrectly.rewrittenNamespaceFollowingClass.js
+++ b/tests/baselines/reference/transformApi/transformsCorrectly.rewrittenNamespaceFollowingClass.js
@@ -1,4 +1,4 @@
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         constructor() {
             this.foo = 10;
diff --git a/tests/baselines/reference/transformApi/transformsCorrectly.transformAddCommentToProperties.js b/tests/baselines/reference/transformApi/transformsCorrectly.transformAddCommentToProperties.js
index 6a7d3c0d77f90..efe8b5346e2e8 100644
--- a/tests/baselines/reference/transformApi/transformsCorrectly.transformAddCommentToProperties.js
+++ b/tests/baselines/reference/transformApi/transformsCorrectly.transformAddCommentToProperties.js
@@ -1,5 +1,5 @@
 /*comment*/
-let Clazz = /** @class */ (() => {
+const Clazz = /** @class */ (() => {
     /*comment*/
     class Clazz {
         /*comment*/
diff --git a/tests/baselines/reference/tscWatch/programUpdates/updates-diagnostics-and-emit-for-decorators.js b/tests/baselines/reference/tscWatch/programUpdates/updates-diagnostics-and-emit-for-decorators.js
index cdc688545f786..fc90c243a6ff2 100644
--- a/tests/baselines/reference/tscWatch/programUpdates/updates-diagnostics-and-emit-for-decorators.js
+++ b/tests/baselines/reference/tscWatch/programUpdates/updates-diagnostics-and-emit-for-decorators.js
@@ -38,7 +38,7 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 import './b';
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
         constructor(p) { }
     };
@@ -158,7 +158,7 @@ var __metadata = (this && this.__metadata) || function (k, v) {
     if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
 };
 import { B } from './b';
-let A = /** @class */ (() => {
+const A = /** @class */ (() => {
     let A = class A {
         constructor(p) { }
     };
diff --git a/tests/baselines/reference/uniqueSymbols.js b/tests/baselines/reference/uniqueSymbols.js
index 70372d894baed..800b8c85bcaee 100644
--- a/tests/baselines/reference/uniqueSymbols.js
+++ b/tests/baselines/reference/uniqueSymbols.js
@@ -314,7 +314,7 @@ async function* asyncGenFuncYieldConstCall() { yield constCall; }
 async function* asyncGenFuncYieldLetCall() { yield letCall; }
 async function* asyncGenFuncYieldVarCall() { yield varCall; }
 // classes
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         constructor() {
             this.readonlyCall = Symbol();
@@ -373,7 +373,7 @@ const o2 = {
     method5(p = s) { return p; },
 };
 // property initializers
-let C0 = /** @class */ (() => {
+const C0 = /** @class */ (() => {
     class C0 {
         constructor() {
             this.a = s;
diff --git a/tests/baselines/reference/uniqueSymbolsDeclarations.js b/tests/baselines/reference/uniqueSymbolsDeclarations.js
index 5f9223ef2b322..5d86b14c723a7 100644
--- a/tests/baselines/reference/uniqueSymbolsDeclarations.js
+++ b/tests/baselines/reference/uniqueSymbolsDeclarations.js
@@ -282,7 +282,7 @@ async function* asyncGenFuncYieldConstCall() { yield constCall; }
 async function* asyncGenFuncYieldLetCall() { yield letCall; }
 async function* asyncGenFuncYieldVarCall() { yield varCall; }
 // classes
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
         constructor() {
             this.readonlyCall = Symbol();
@@ -341,7 +341,7 @@ const o2 = {
     method5(p = s) { return p; }
 };
 // property initializers
-let C0 = /** @class */ (() => {
+const C0 = /** @class */ (() => {
     class C0 {
         constructor() {
             this.a = s;
diff --git a/tests/baselines/reference/useBeforeDeclaration_jsx.js b/tests/baselines/reference/useBeforeDeclaration_jsx.js
index 7f443a826c5f7..458f03e88772a 100644
--- a/tests/baselines/reference/useBeforeDeclaration_jsx.js
+++ b/tests/baselines/reference/useBeforeDeclaration_jsx.js
@@ -16,7 +16,7 @@ class C {
 
 
 //// [useBeforeDeclaration_jsx.jsx]
-let C = /** @class */ (() => {
+const C = /** @class */ (() => {
     class C {
     }
     C.a = <C.z></C.z>;
diff --git a/tests/baselines/reference/useBeforeDeclaration_propertyAssignment.js b/tests/baselines/reference/useBeforeDeclaration_propertyAssignment.js
index d3ab479be50be..07907687927ad 100644
--- a/tests/baselines/reference/useBeforeDeclaration_propertyAssignment.js
+++ b/tests/baselines/reference/useBeforeDeclaration_propertyAssignment.js
@@ -25,7 +25,7 @@ export class C {
         this.c = { c: this.b };
     }
 }
-let D = /** @class */ (() => {
+const D = /** @class */ (() => {
     class D {
     }
     D.A = class extends D.B {