From 0fb5f23466a84835cb1b4202d06ec53dc1592961 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Tue, 19 May 2020 18:55:06 -0400
Subject: fix(doc): crash on formatting type predicate (#5651)

---
 cli/doc/tests.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'cli/doc/tests.rs')

diff --git a/cli/doc/tests.rs b/cli/doc/tests.rs
index f8e693c9a..7f2c18639 100644
--- a/cli/doc/tests.rs
+++ b/cli/doc/tests.rs
@@ -161,6 +161,19 @@ export function foo(a: string, b?: number, cb: (...cbArgs: unknown[]) => void, .
   );
 }
 
+#[tokio::test]
+async fn format_type_predicate() {
+  let source_code = r#"
+export function isFish(pet: Fish | Bird): pet is Fish {
+    return (pet as Fish).swim !== undefined;
+}
+"#;
+  let loader =
+    TestLoader::new(vec![("test.ts".to_string(), source_code.to_string())]);
+  let entries = DocParser::new(loader).parse("test.ts").await.unwrap();
+  super::printer::format(entries);
+}
+
 #[tokio::test]
 async fn export_fn2() {
   let source_code = r#"
-- 
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