From 81f0b124766ac4fe86dbeeda2aa9498e4026103b Mon Sep 17 00:00:00 2001
From: atanasster <atanasster@gmail.com>
Date: Tue, 7 Jul 2020 10:49:46 -0400
Subject: [PATCH] fix: checks for missing doc and duplicated title

---
 core/loader/src/store.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/loader/src/store.ts b/core/loader/src/store.ts
index 44b1d768f..34c7f0a22 100644
--- a/core/loader/src/store.ts
+++ b/core/loader/src/store.ts
@@ -97,12 +97,20 @@ export const reserveStories = (filePaths: string[]) => {
 };
 export const addStoriesDoc = (filePath: string, added: LoadingDocStore) => {
   const { components, packages, stories, doc } = added;
+  if (!doc) {
+    throw new FatalError(`Invalid store with no document ${filePath}`);
+  }
+
   Object.keys(components).forEach(key => {
     store.components[key] = components[key];
   });
   Object.keys(packages).forEach(key => {
     store.packages[key] = packages[key];
   });
+  const { title } = doc;
+  if (store.stores.find(s => s.doc?.title === title)) {
+    throw new FatalError(`Duplicate document title "${title}"`);
+  }
   const storeStore = store.stores.find(s => s.filePath === filePath);
   if (storeStore) {
     storeStore.stories = stories;