Merge pull request #2639 from bladerunner2020/master

fix: empty markdown files in external documents

Author: Gerrit0

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);

src/test/converter2/issues/gh2638/empty.md

@@ -0,0 +1,5 @@
+/**
+ * @module
+ * @document empty.md
+ */
+export const a = 123;

src/test/converter2/issues/gh2638/index.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),
+            [[]],
+        );
+    });
 });