From 1318e1e3e0659238b5590ec791106eefabe4b344 Mon Sep 17 00:00:00 2001
From: Andy Hanson <anhans@microsoft.com>
Date: Mon, 1 May 2017 15:34:49 -0700
Subject: [PATCH] importTracker: Fix error for undefined importClause

---
 src/services/importTracker.ts                      |  4 ++++
 tests/cases/fourslash/findAllRefsNoImportClause.ts | 11 +++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 tests/cases/fourslash/findAllRefsNoImportClause.ts

diff --git a/src/services/importTracker.ts b/src/services/importTracker.ts
index 0108d830dd1..c94d5cc3143 100644
--- a/src/services/importTracker.ts
+++ b/src/services/importTracker.ts
@@ -212,6 +212,10 @@ namespace ts.FindAllReferences {
                 return;
             }
 
+            if (!decl.importClause) {
+                return;
+            }
+
             const { importClause } = decl;
 
             const { namedBindings } = importClause;
diff --git a/tests/cases/fourslash/findAllRefsNoImportClause.ts b/tests/cases/fourslash/findAllRefsNoImportClause.ts
new file mode 100644
index 00000000000..52bc68bba20
--- /dev/null
+++ b/tests/cases/fourslash/findAllRefsNoImportClause.ts
@@ -0,0 +1,11 @@
+/// <reference path="fourslash.ts" />
+
+// https://github.com/Microsoft/TypeScript/issues/15452
+
+// @Filename: /a.ts
+////export const [|{| "isWriteAccess": true, "isDefinition": true |}x|] = 0;
+
+// @Filename: /b.ts
+////import "./a";
+
+verify.singleReferenceGroup("const x: 0");