From eca6410c6ef32e7ee2affb0abde9750abf69e16b Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Tue, 6 Feb 2018 11:37:34 -0800
Subject: [PATCH] Add top-level completion for path mapping (#21686) (#21689)

---
 src/services/pathCompletions.ts                 |  2 +-
 .../completionsPaths_pathMapping_topLevel.ts    | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 tests/cases/fourslash/completionsPaths_pathMapping_topLevel.ts

diff --git a/src/services/pathCompletions.ts b/src/services/pathCompletions.ts
index 8840919c329..cf0d07b2351 100644
--- a/src/services/pathCompletions.ts
+++ b/src/services/pathCompletions.ts
@@ -187,7 +187,7 @@ namespace ts.Completions.PathCompletions {
 
         const pathPrefix = path.slice(0, path.length - 1);
         if (!startsWith(fragment, pathPrefix)) {
-            return emptyArray;
+            return [pathPrefix];
         }
 
         const remainingFragment = fragment.slice(pathPrefix.length);
diff --git a/tests/cases/fourslash/completionsPaths_pathMapping_topLevel.ts b/tests/cases/fourslash/completionsPaths_pathMapping_topLevel.ts
new file mode 100644
index 00000000000..963851f5bc6
--- /dev/null
+++ b/tests/cases/fourslash/completionsPaths_pathMapping_topLevel.ts
@@ -0,0 +1,17 @@
+/// <reference path="fourslash.ts" />
+
+// @Filename: /x/src/a.ts
+////import {} from "[|/**/|]";
+
+// @Filename: /x/tsconfig.json
+////{
+////    "compilerOptions": {
+////        "baseUrl": ".",
+////        "paths": {
+////            "foo/*": ["src/*"]
+////        }
+////    }
+////}
+
+const [replacementSpan] = test.ranges();
+verify.completionsAt("", ["src", "foo/"].map(name => ({ name, replacementSpan })));