From 3c6393afe1b60cf10c6fef72cd39089e9f7927dc Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Fri, 19 May 2017 15:18:26 -0700
Subject: [PATCH] More fix+cleanup in getNameOfDeclaration

---
 src/compiler/utilities.ts | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index aaf9fdd97f3..2a2fcd3820e 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -4705,18 +4705,15 @@ namespace ts {
             return undefined;
         }
         if (declaration.kind === SyntaxKind.BinaryExpression) {
-            const kind = getSpecialPropertyAssignmentKind(declaration as BinaryExpression);
-            const lhs = (declaration as BinaryExpression).left;
-            switch (kind) {
-                case SpecialPropertyAssignmentKind.None:
-                case SpecialPropertyAssignmentKind.ModuleExports:
-                    return undefined;
+            const expr = declaration as BinaryExpression;
+            switch (getSpecialPropertyAssignmentKind(expr)) {
                 case SpecialPropertyAssignmentKind.ExportsProperty:
                 case SpecialPropertyAssignmentKind.ThisProperty:
                 case SpecialPropertyAssignmentKind.Property:
-                    return (lhs as PropertyAccessExpression).name;
                 case SpecialPropertyAssignmentKind.PrototypeProperty:
-                    return ((lhs as PropertyAccessExpression).expression as PropertyAccessExpression).name;
+                    return (expr.left as PropertyAccessExpression).name;
+                default:
+                    return undefined;
             }
         }
         else {