From 0ce51e684f8ba4134e8fbdbdc4dcb82c27e51af8 Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Fri, 30 Jan 2015 18:22:12 -0800
Subject: [PATCH] Fix #1871 by ensuring the at we get the canonical filename
 before we check the extension

---
 src/compiler/program.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 9b52b8dc9ca..ecd8fd71f88 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -176,7 +176,7 @@ module ts {
             }
             var diagnostic: DiagnosticMessage;
             if (hasExtension(filename)) {
-                if (!options.allowNonTsExtensions && !fileExtensionIs(filename, ".ts")) {
+                if (!options.allowNonTsExtensions && !fileExtensionIs(host.getCanonicalFileName(filename), ".ts")) {
                     diagnostic = Diagnostics.File_0_must_have_extension_ts_or_d_ts;
                 }
                 else if (!findSourceFile(filename, isDefaultLib, refFile, refPos, refEnd)) {