From 739e1e9786c827055ad2dcb4445001cb1563b050 Mon Sep 17 00:00:00 2001
From: BigAru <arooran@indikon.ch>
Date: Wed, 7 Nov 2018 08:49:50 +0100
Subject: [PATCH] fix for unnecessary duplication of comment

---
 ...onvertArrowFunctionOrFunctionExpression.ts |  1 +
 ...tionExpression_ToNamed_Modifier_Comment.ts | 19 +++++++++++++++++++
 ...sion_ToNamed_MultiDecl_Modifier_Comment.ts | 17 +++++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_Modifier_Comment.ts
 create mode 100644 tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_MultiDecl_Modifier_Comment.ts

diff --git a/src/services/refactors/convertArrowFunctionOrFunctionExpression.ts b/src/services/refactors/convertArrowFunctionOrFunctionExpression.ts
index 9bf16775f6c..685ea4b5275 100644
--- a/src/services/refactors/convertArrowFunctionOrFunctionExpression.ts
+++ b/src/services/refactors/convertArrowFunctionOrFunctionExpression.ts
@@ -149,6 +149,7 @@ namespace ts.refactor.convertArrowFunctionOrFunctionExpression {
         if (!variableInfo) return undefined;
 
         const { variableDeclaration, variableDeclarationList, statement, name } = variableInfo;
+        suppressLeadingTrivia(statement);
         const newNode = createFunctionDeclaration(func.decorators, statement.modifiers, func.asteriskToken, name, func.typeParameters, func.parameters, func.type, body);
         let edits: FileTextChanges[];
 
diff --git a/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_Modifier_Comment.ts b/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_Modifier_Comment.ts
new file mode 100644
index 00000000000..20bb3885590
--- /dev/null
+++ b/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_Modifier_Comment.ts
@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+//// // Do not add me second time
+//// export let foo = /*x*/a/*y*/ => {
+////    let b = 1;
+////    return a + b;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to named function",
+    actionDescription: "Convert to named function",
+    newContent: `// Do not add me second time
+export function foo(a) {
+    let b = 1;
+    return a + b;
+}`,
+});
diff --git a/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_MultiDecl_Modifier_Comment.ts b/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_MultiDecl_Modifier_Comment.ts
new file mode 100644
index 00000000000..46fc080ebda
--- /dev/null
+++ b/tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToNamed_MultiDecl_Modifier_Comment.ts
@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//// // Do not add me second time
+//// export let foo, bar = /*x*/(/*y*/) => 1 + 1;
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to named function",
+    actionDescription: "Convert to named function",
+    newContent: `// Do not add me second time
+export let foo;
+export function bar() {
+    return 1 + 1;
+}
+`,
+});