From f26d981d9b3cff55f7da0741ec3ade6cc8c0f3bd Mon Sep 17 00:00:00 2001
From: bladerunnaer2020 <pivovarov@gmail.com>
Date: Sat, 13 Jul 2024 18:20:56 +0300
Subject: [PATCH] fix/gh2638

---
 src/lib/converter/comments/parser.ts       | 2 +-
 src/test/converter2/issues/gh2638/empty.md | 0
 src/test/converter2/issues/gh2638/index.ts | 5 +++++
 src/test/issues.c2.test.ts                 | 8 ++++++++
 4 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 src/test/converter2/issues/gh2638/empty.md
 create mode 100644 src/test/converter2/issues/gh2638/index.ts

diff --git a/src/lib/converter/comments/parser.ts b/src/lib/converter/comments/parser.ts
index af65774ea..49109d079 100644
--- a/src/lib/converter/comments/parser.ts
+++ b/src/lib/converter/comments/parser.ts
@@ -203,7 +203,7 @@ export function parseCommentString(
     // Check for frontmatter
     let frontmatterData: Record<string, unknown> = {};
     const firstBlock = content[0];
-    if (firstBlock.text.startsWith("---\n")) {
+    if (firstBlock?.text?.startsWith("---\n")) {
         const end = firstBlock.text.indexOf("\n---\n");
         if (end !== -1) {
             const yamlText = firstBlock.text.slice("---\n".length, end);
diff --git a/src/test/converter2/issues/gh2638/empty.md b/src/test/converter2/issues/gh2638/empty.md
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/test/converter2/issues/gh2638/index.ts b/src/test/converter2/issues/gh2638/index.ts
new file mode 100644
index 000000000..432ef494a
--- /dev/null
+++ b/src/test/converter2/issues/gh2638/index.ts
@@ -0,0 +1,5 @@
+/**
+ * @module
+ * @document empty.md
+ */
+export const a = 123;
diff --git a/src/test/issues.c2.test.ts b/src/test/issues.c2.test.ts
index 8fa2778aa..97162d2c8 100644
--- a/src/test/issues.c2.test.ts
+++ b/src/test/issues.c2.test.ts
@@ -1655,4 +1655,12 @@ describe("Issue Tests", () => {
         const sig = querySig(project, "B.constructor");
         equal(sig.parameters?.length, 1);
     });
+
+    it("#2638 empty markdown file", () => {
+        const project = convert();
+        equal(
+            project.documents?.map((d) => d.content),
+            [[]],
+        );
+    });
 });