From a404edae384f758e604a9457a9476de613436b68 Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Sat, 10 Jun 2017 11:12:09 -0700
Subject: [PATCH] Split import into var and type to avoid breaking backword
 compatability of tsserverlibrary (#16409)

---
 src/server/session.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/server/session.ts b/src/server/session.ts
index 713f0a0f179..c06e33eb979 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -112,7 +112,13 @@ namespace ts.server {
         return true;
     }
 
-    export import CommandNames = protocol.CommandTypes;
+    // CommandNames used to be exposed before TS 2.4 as a namespace
+    // In TS 2.4 we switched to an enum, keep this for backward compatibility
+    // The var assignment ensures that even though CommandTypes are a const enum
+    // we want to ensure the value is maintained in the out since the file is
+    // built using --preseveConstEnum.
+    export type CommandNames = protocol.CommandTypes;
+    export const CommandNames = (<any>protocol).CommandTypes;
 
     export function formatMessage<T extends protocol.Message>(msg: T, logger: server.Logger, byteLength: (s: string, encoding: string) => number, newLine: string): string {
         const verboseLogging = logger.hasLevel(LogLevel.verbose);