From 1cf6c6d07944c5f85e28b05bbefdac88c48eeb43 Mon Sep 17 00:00:00 2001
From: Andy Hanson <anhans@microsoft.com>
Date: Wed, 16 Aug 2017 08:02:19 -0700
Subject: [PATCH] Avoid climbing ancestors in `getAnyImportSyntax`

---
 src/compiler/checker.ts | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 4481531b5982d..efec102b0051c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -1330,13 +1330,18 @@ namespace ts {
             return parent && !!findAncestor(initial, n => n === stopAt || isFunctionLike(n) ? "quit" : n === parent);
         }
 
-        function getAnyImportSyntax(node: Node): AnyImportSyntax {
-            if (isAliasSymbolDeclaration(node)) {
-                if (node.kind === SyntaxKind.ImportEqualsDeclaration) {
-                    return <ImportEqualsDeclaration>node;
-                }
-
-                return findAncestor(node, isImportDeclaration);
+        function getAnyImportSyntax(node: Node): AnyImportSyntax | undefined {
+            switch (node.kind) {
+                case SyntaxKind.ImportEqualsDeclaration:
+                    return node as ImportEqualsDeclaration;
+                case SyntaxKind.ImportClause:
+                    return (node as ImportClause).parent;
+                case SyntaxKind.NamespaceImport:
+                    return (node as NamespaceImport).parent.parent;
+                case SyntaxKind.ImportSpecifier:
+                    return (node as ImportSpecifier).parent.parent.parent;
+                default:
+                    return undefined;
             }
         }