From e50b24a83beec5d4c1f81b9dcb8ea66534b20e49 Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Tue, 17 Apr 2018 09:15:05 -0700
Subject: [PATCH] convertFunctionToEs6Class: Copy comment from variable
 declaration (#23445)

---
 .../codefixes/convertFunctionToEs6Class.ts       |  3 ++-
 ...ionToEs6Class_commentOnVariableDeclaration.ts | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 tests/cases/fourslash/convertFunctionToEs6Class_commentOnVariableDeclaration.ts

diff --git a/src/services/codefixes/convertFunctionToEs6Class.ts b/src/services/codefixes/convertFunctionToEs6Class.ts
index bf20aeda72b..d137785a7e7 100644
--- a/src/services/codefixes/convertFunctionToEs6Class.ts
+++ b/src/services/codefixes/convertFunctionToEs6Class.ts
@@ -34,13 +34,14 @@ namespace ts.codefix {
 
             case SyntaxKind.VariableDeclaration:
                 precedingNode = ctorDeclaration.parent.parent;
+                newClassDeclaration = createClassFromVariableDeclaration(ctorDeclaration as VariableDeclaration);
                 if ((<VariableDeclarationList>ctorDeclaration.parent).declarations.length === 1) {
+                    copyComments(precedingNode, newClassDeclaration, sourceFile);
                     deleteNode(precedingNode);
                 }
                 else {
                     deleteNode(ctorDeclaration, /*inList*/ true);
                 }
-                newClassDeclaration = createClassFromVariableDeclaration(ctorDeclaration as VariableDeclaration);
                 break;
         }
 
diff --git a/tests/cases/fourslash/convertFunctionToEs6Class_commentOnVariableDeclaration.ts b/tests/cases/fourslash/convertFunctionToEs6Class_commentOnVariableDeclaration.ts
new file mode 100644
index 00000000000..417bf0bc905
--- /dev/null
+++ b/tests/cases/fourslash/convertFunctionToEs6Class_commentOnVariableDeclaration.ts
@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+// @allowJs: true
+// @Filename: /a.js
+/////** Doc */
+////const C = function() { this.x = 0; }
+
+verify.codeFix({
+    description: "Convert function to an ES2015 class",
+    newFileContent:
+`/** Doc */
+class C {
+    constructor() { this.x = 0; }
+}
+`,
+});