From 4087757e9d376cdc97b30a4516881db1f90636ae Mon Sep 17 00:00:00 2001
From: TypeScript Bot <ts_bot@rcavanaugh.com>
Date: Thu, 28 May 2020 18:14:29 +0000
Subject: [PATCH] Bump version to 3.9.4 and LKG

---
 lib/tsc.js                 | 17 ++++++++---------
 lib/tsserver.js            | 22 ++++++++++------------
 lib/tsserverlibrary.js     | 22 ++++++++++------------
 lib/typescript.js          | 22 ++++++++++------------
 lib/typescriptServices.js  | 22 ++++++++++------------
 lib/typingsInstaller.js    | 22 ++++++++++------------
 package.json               |  2 +-
 src/compiler/corePublic.ts |  2 +-
 8 files changed, 60 insertions(+), 71 deletions(-)

diff --git a/lib/tsc.js b/lib/tsc.js
index 9294e9ec7b2..d250b6958f3 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -67,7 +67,7 @@ var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cook
 var ts;
 (function (ts) {
     ts.versionMajorMinor = "3.9";
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     function tryGetNativeMap() {
         return typeof Map !== "undefined" && "entries" in Map.prototype ? Map : undefined;
     }
@@ -65536,6 +65536,8 @@ var ts;
                 facts |= 32;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16;
+            if (languageVersion <= 1 && (facts & 7))
+                facts |= 128;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -65553,7 +65555,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, true, true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7) {
+            if (facts & 128) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 ? ts.getGeneratedNameForNode(node) : undefined);
@@ -65564,7 +65566,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, false);
             addClassElementDecorationStatements(statements, node, true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7) {
+            if (facts & 128) {
                 var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentSourceFile.text, node.members.end), 19);
                 var localName = ts.getInternalName(node);
                 var outer = ts.createPartiallyEmittedExpression(localName);
@@ -65577,12 +65579,9 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432);
-                if (languageVersion > 1) {
-                    ts.addSyntheticLeadingComment(iife, 3, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, false, false), undefined, iife)
-                ], languageVersion > 1 ? 1 : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -65592,7 +65591,7 @@ var ts;
             if (facts & 8) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 || facts & 2) {
+            else if (facts & 128 || facts & 2) {
                 if (facts & 32) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, false, true)));
                 }
@@ -65607,7 +65606,7 @@ var ts;
             return ts.singleOrMany(statements);
         }
         function createClassDeclarationHeadWithoutDecorators(node, name, facts) {
-            var modifiers = !(facts & 7)
+            var modifiers = !(facts & 128)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(undefined, modifiers, name, undefined, ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause), transformClassMembers(node));
diff --git a/lib/tsserver.js b/lib/tsserver.js
index b45cc52a005..58fd6f824c6 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -94,7 +94,7 @@ var ts;
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     ts.versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     /**
      * Returns the native Map implementation if it is available and compatible (i.e. supports iteration).
      */
@@ -77269,9 +77269,10 @@ var ts;
         ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
         ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
         ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
         ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
-        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 7] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
     })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
@@ -77758,6 +77759,8 @@ var ts;
                 facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -77775,7 +77778,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, /*requireInitializer*/ true, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
@@ -77787,7 +77790,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
             addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
                 // 'es2015' transformer can properly nest static initializers and decorators. The result
                 // looks something like:
@@ -77813,16 +77816,11 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > 1 /* ES5 */) {
-                    ts.addSyntheticLeadingComment(iife, 3 /* MultiLineCommentTrivia */, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(
                 /*modifiers*/ undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
                     /*type*/ undefined, iife)
-                ], languageVersion > 1 /* ES5 */ ? 1 /* Let */ : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -77835,7 +77833,7 @@ var ts;
             if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
                 if (facts & 32 /* IsDefaultExternalExport */) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
@@ -77862,7 +77860,7 @@ var ts;
             //      ${members}
             //  }
             // we do not emit modifiers on the declaration if we are emitting an IIFE
-            var modifiers = !(facts & 7 /* UseImmediatelyInvokedFunctionExpression */)
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index b6d63386244..71401dfc371 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -244,7 +244,7 @@ var ts;
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     ts.versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     /**
      * Returns the native Map implementation if it is available and compatible (i.e. supports iteration).
      */
@@ -77419,9 +77419,10 @@ var ts;
         ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
         ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
         ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
         ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
-        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 7] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
     })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
@@ -77908,6 +77909,8 @@ var ts;
                 facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -77925,7 +77928,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, /*requireInitializer*/ true, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
@@ -77937,7 +77940,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
             addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
                 // 'es2015' transformer can properly nest static initializers and decorators. The result
                 // looks something like:
@@ -77963,16 +77966,11 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > 1 /* ES5 */) {
-                    ts.addSyntheticLeadingComment(iife, 3 /* MultiLineCommentTrivia */, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(
                 /*modifiers*/ undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
                     /*type*/ undefined, iife)
-                ], languageVersion > 1 /* ES5 */ ? 1 /* Let */ : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -77985,7 +77983,7 @@ var ts;
             if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
                 if (facts & 32 /* IsDefaultExternalExport */) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
@@ -78012,7 +78010,7 @@ var ts;
             //      ${members}
             //  }
             // we do not emit modifiers on the declaration if we are emitting an IIFE
-            var modifiers = !(facts & 7 /* UseImmediatelyInvokedFunctionExpression */)
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(
diff --git a/lib/typescript.js b/lib/typescript.js
index 423d4c31612..a7a20629768 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -244,7 +244,7 @@ var ts;
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     ts.versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     /**
      * Returns the native Map implementation if it is available and compatible (i.e. supports iteration).
      */
@@ -77419,9 +77419,10 @@ var ts;
         ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
         ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
         ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
         ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
-        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 7] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
     })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
@@ -77908,6 +77909,8 @@ var ts;
                 facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -77925,7 +77928,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, /*requireInitializer*/ true, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
@@ -77937,7 +77940,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
             addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
                 // 'es2015' transformer can properly nest static initializers and decorators. The result
                 // looks something like:
@@ -77963,16 +77966,11 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > 1 /* ES5 */) {
-                    ts.addSyntheticLeadingComment(iife, 3 /* MultiLineCommentTrivia */, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(
                 /*modifiers*/ undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
                     /*type*/ undefined, iife)
-                ], languageVersion > 1 /* ES5 */ ? 1 /* Let */ : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -77985,7 +77983,7 @@ var ts;
             if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
                 if (facts & 32 /* IsDefaultExternalExport */) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
@@ -78012,7 +78010,7 @@ var ts;
             //      ${members}
             //  }
             // we do not emit modifiers on the declaration if we are emitting an IIFE
-            var modifiers = !(facts & 7 /* UseImmediatelyInvokedFunctionExpression */)
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 3c934b91701..174193080fb 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -244,7 +244,7 @@ var ts;
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     ts.versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     /**
      * Returns the native Map implementation if it is available and compatible (i.e. supports iteration).
      */
@@ -77419,9 +77419,10 @@ var ts;
         ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
         ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
         ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
         ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
-        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 7] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
     })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
@@ -77908,6 +77909,8 @@ var ts;
                 facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -77925,7 +77928,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, /*requireInitializer*/ true, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
@@ -77937,7 +77940,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
             addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
                 // 'es2015' transformer can properly nest static initializers and decorators. The result
                 // looks something like:
@@ -77963,16 +77966,11 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > 1 /* ES5 */) {
-                    ts.addSyntheticLeadingComment(iife, 3 /* MultiLineCommentTrivia */, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(
                 /*modifiers*/ undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
                     /*type*/ undefined, iife)
-                ], languageVersion > 1 /* ES5 */ ? 1 /* Let */ : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -77985,7 +77983,7 @@ var ts;
             if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
                 if (facts & 32 /* IsDefaultExternalExport */) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
@@ -78012,7 +78010,7 @@ var ts;
             //      ${members}
             //  }
             // we do not emit modifiers on the declaration if we are emitting an IIFE
-            var modifiers = !(facts & 7 /* UseImmediatelyInvokedFunctionExpression */)
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index a30a2a2bb2a..e6475f4829d 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -83,7 +83,7 @@ var ts;
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     ts.versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    ts.version = "3.9.3";
+    ts.version = "3.9.4";
     /**
      * Returns the native Map implementation if it is available and compatible (i.e. supports iteration).
      */
@@ -77258,9 +77258,10 @@ var ts;
         ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
         ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
         ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
         ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
-        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 7] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
         ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
     })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
@@ -77747,6 +77748,8 @@ var ts;
                 facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
                 facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
         function hasTypeScriptClassSyntax(node) {
@@ -77764,7 +77767,7 @@ var ts;
             }
             var staticProperties = ts.getProperties(node, /*requireInitializer*/ true, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
             var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
@@ -77776,7 +77779,7 @@ var ts;
             addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
             addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
                 // 'es2015' transformer can properly nest static initializers and decorators. The result
                 // looks something like:
@@ -77802,16 +77805,11 @@ var ts;
                 ts.insertStatementsAfterStandardPrologue(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
                 ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > 1 /* ES5 */) {
-                    ts.addSyntheticLeadingComment(iife, 3 /* MultiLineCommentTrivia */, "* @class ");
-                }
                 var varStatement = ts.createVariableStatement(
                 /*modifiers*/ undefined, ts.createVariableDeclarationList([
                     ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
                     /*type*/ undefined, iife)
-                ], languageVersion > 1 /* ES5 */ ? 1 /* Let */ : undefined));
+                ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
                 ts.setSourceMapRange(varStatement, ts.moveRangePastDecorators(node));
@@ -77824,7 +77822,7 @@ var ts;
             if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 7 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
                 if (facts & 32 /* IsDefaultExternalExport */) {
                     statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
@@ -77851,7 +77849,7 @@ var ts;
             //      ${members}
             //  }
             // we do not emit modifiers on the declaration if we are emitting an IIFE
-            var modifiers = !(facts & 7 /* UseImmediatelyInvokedFunctionExpression */)
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
             var classDeclaration = ts.createClassDeclaration(
diff --git a/package.json b/package.json
index 479179622c1..fc3d79884a6 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "https://www.typescriptlang.org/",
-    "version": "3.9.3",
+    "version": "3.9.4",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [
diff --git a/src/compiler/corePublic.ts b/src/compiler/corePublic.ts
index 9b149a43c30..6ff7176d32a 100644
--- a/src/compiler/corePublic.ts
+++ b/src/compiler/corePublic.ts
@@ -3,7 +3,7 @@ namespace ts {
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     export const versionMajorMinor = "3.9";
     /** The version of the TypeScript compiler release */
-    export const version = "3.9.3" as string;
+    export const version = "3.9.4" as string;
 
     /**
      * Type of objects whose values are all of the same type.