From 08a494ecbfe4d243aa305d0356276a1c1b08b66f Mon Sep 17 00:00:00 2001
From: MartyIX <vseticka.martin@gmail.com>
Date: Sun, 27 Sep 2015 22:51:49 +0200
Subject: [PATCH] Update emitter.ts

Proposed fix for #4908

Can anybody confirm if I'm on a right track?
---
 src/compiler/emitter.ts                          | 6 ++++--
 tests/baselines/reference/classExpressionES63.js | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 6a6b75af65f..51e919ee8ee 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -4529,8 +4529,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
 
                 write("class");
 
-                // check if this is an "export default class" as it may not have a name. Do not emit the name if the class is decorated.
-                if ((node.name || !(node.flags & NodeFlags.Default)) && !thisNodeIsDecorated) {
+                // emit name if
+                // - node has a name
+                // - this is default export and target is not ES6 (for ES6 `export default` does not need to be compiled downlevel)                
+                if ((node.name || (node.flags & NodeFlags.Default && languageVersion < ScriptTarget.ES6)) && !thisNodeIsDecorated) {
                     write(" ");
                     emitDeclarationName(node);
                 }
diff --git a/tests/baselines/reference/classExpressionES63.js b/tests/baselines/reference/classExpressionES63.js
index 6d357af7c5a..6b3a06cf7c3 100644
--- a/tests/baselines/reference/classExpressionES63.js
+++ b/tests/baselines/reference/classExpressionES63.js
@@ -7,7 +7,7 @@ c.c;
 
 
 //// [classExpressionES63.js]
-let C = class class_1 extends class class_2 extends class class_3 {
+let C = class extends class extends class {
     constructor() {
         this.a = 1;
     }