From 6c78ce31ead3e4351ebe55f1a1197782982e02ce Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Mon, 11 Jun 2018 17:00:17 -0700
Subject: [PATCH] Set use flag (#24881)

---
 src/services/signatureHelp.ts                     |  2 +-
 ...tureHelpForNonlocalTypeDoesNotUseImportType.ts | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 tests/cases/fourslash/signatureHelpForNonlocalTypeDoesNotUseImportType.ts

diff --git a/src/services/signatureHelp.ts b/src/services/signatureHelp.ts
index 94f95641fed..ac13a2c7904 100644
--- a/src/services/signatureHelp.ts
+++ b/src/services/signatureHelp.ts
@@ -366,7 +366,7 @@ namespace ts.SignatureHelp {
         return invocation.kind === InvocationKind.Call ? getInvokedExpression(invocation.node) : invocation.called;
     }
 
-    const signatureHelpNodeBuilderFlags = NodeBuilderFlags.OmitParameterModifiers | NodeBuilderFlags.IgnoreErrors;
+    const signatureHelpNodeBuilderFlags = NodeBuilderFlags.OmitParameterModifiers | NodeBuilderFlags.IgnoreErrors | NodeBuilderFlags.UseAliasDefinedOutsideCurrentScope;
     function createSignatureHelpItems(candidates: ReadonlyArray<Signature>, resolvedSignature: Signature, argumentListInfo: ArgumentListInfo, sourceFile: SourceFile, typeChecker: TypeChecker): SignatureHelpItems {
         const { argumentCount, argumentsSpan: applicableSpan, invocation, argumentIndex } = argumentListInfo;
         const isTypeParameterList = argumentListInfo.kind === ArgumentListKind.TypeArguments;
diff --git a/tests/cases/fourslash/signatureHelpForNonlocalTypeDoesNotUseImportType.ts b/tests/cases/fourslash/signatureHelpForNonlocalTypeDoesNotUseImportType.ts
new file mode 100644
index 00000000000..42efddb65f4
--- /dev/null
+++ b/tests/cases/fourslash/signatureHelpForNonlocalTypeDoesNotUseImportType.ts
@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts" />
+
+// @Filename: exporter.ts
+////export interface Thing {}
+////export const Foo: () => Thing = null as any;
+
+// @Filename: usage.ts
+////import {Foo} from "./exporter"
+////function f(p = Foo()): void {}
+////f(/*1*/
+
+verify.signatureHelp({
+    marker: "1",
+    text: "f(p?: Thing): void"
+});
\ No newline at end of file