From 59fc32929ba3f5a8573b1d9c11a2edb80618b81d Mon Sep 17 00:00:00 2001
From: Aron Griffis <aron@scampersand.com>
Date: Wed, 20 Sep 2023 16:15:12 -0400
Subject: [PATCH] fix: don't remove redundant filename part if there won't be
 anything left

---
 .../preview-api/src/modules/store/autoTitle.test.ts  | 12 ++++++++++++
 code/lib/preview-api/src/modules/store/autoTitle.ts  |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/code/lib/preview-api/src/modules/store/autoTitle.test.ts b/code/lib/preview-api/src/modules/store/autoTitle.test.ts
index 013ccac6690f..312f1bced806 100644
--- a/code/lib/preview-api/src/modules/store/autoTitle.test.ts
+++ b/code/lib/preview-api/src/modules/store/autoTitle.test.ts
@@ -240,6 +240,18 @@ describe('userOrAutoTitleFromSpecifier', () => {
         ).toMatchInlineSnapshot(`to_my/file`);
       });
 
+      it('match with short path', () => {
+        // Make sure "stories" isn't trimmed as redundant when there won't be
+        // anything left.
+        expect(
+          userOrAuto(
+            './path/stories.js',
+            normalizeStoriesEntry({ directory: './path', files: '**/?(*.)stories.*' }, options),
+            undefined
+          )
+        ).toMatchInlineSnapshot(`stories`);
+      });
+
       it('match with windows path', () => {
         expect(
           userOrAuto(
diff --git a/code/lib/preview-api/src/modules/store/autoTitle.ts b/code/lib/preview-api/src/modules/store/autoTitle.ts
index 85fff681ddf2..72965b06aad4 100644
--- a/code/lib/preview-api/src/modules/store/autoTitle.ts
+++ b/code/lib/preview-api/src/modules/store/autoTitle.ts
@@ -15,7 +15,7 @@ const stripExtension = (parts: string[]) => {
 const removeRedundantFilename = (parts: string[]) => {
   const last = parts[parts.length - 1];
   const nextToLast = parts[parts.length - 2];
-  return last && (last === nextToLast || /^(?:index|story|stories)$/i.test(last))
+  return last && nextToLast && (last === nextToLast || /^(?:index|story|stories)$/i.test(last))
     ? parts.slice(0, -1)
     : parts;
 };