From 1dab9526c15eb13f5d7095c9e7a4cf270241b4ac Mon Sep 17 00:00:00 2001
From: bluelovers <codelovers@users.sourceforge.net>
Date: Fri, 7 Jun 2019 14:43:06 +0800
Subject: [PATCH] emitDeclarationFileOrBundle: allow preserve comments in
 declaration

---
 src/compiler/commandLineParser.ts    | 8 ++++++++
 src/compiler/diagnosticMessages.json | 6 +++++-
 src/compiler/emitter.ts              | 2 +-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 394a94cb663b7..5d1257d21c627 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -369,6 +369,14 @@ namespace ts {
             category: Diagnostics.Basic_Options,
             description: Diagnostics.Do_not_emit_comments_to_output,
         },
+        {
+            name: "preserveDeclarationComments",
+            type: "boolean",
+            affectsEmit: true,
+            showInSimplifiedHelpView: true,
+            category: Diagnostics.Basic_Options,
+            description: Diagnostics.Preserve_emit_comments_to_output_in_declaration,
+        },
         {
             name: "noEmit",
             type: "boolean",
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 5d6dc7d6df411..94b45e22a3b15 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -4109,6 +4109,10 @@
         "category": "Message",
         "code": 6502
     },
+    "Preserve emit comments to output in declaration.": {
+        "category": "Message",
+        "code": 6503
+    },
 
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
@@ -4295,7 +4299,7 @@
     "Element implicitly has an 'any' type because expression of type '{0}' can't be used to index type '{1}'.": {
         "category": "Error",
         "code": 7053
-    },    
+    },
     "No index signature with a parameter of type '{0}' was found on type '{1}'.": {
         "category": "Error",
         "code": 7054
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index ddd273c360201..83738427092a1 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -356,7 +356,7 @@ namespace ts {
             }
 
             const printerOptions: PrinterOptions = {
-                removeComments: compilerOptions.removeComments,
+                removeComments: compilerOptions.removeComments && !compilerOptions.preserveDeclarationComments,
                 newLine: compilerOptions.newLine,
                 noEmitHelpers: true,
                 module: compilerOptions.module,