From d4f4c7c4d48f64f093a0204e83097eaf01936d25 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Gabriel=20Loi=C3=A1cono?=
 <32134586+loiacon@users.noreply.github.com>
Date: Tue, 26 Nov 2019 23:00:32 -0300
Subject: [PATCH] fix(runtime-core): renderList with default value when source
 is undefined (#498)

---
 packages/runtime-core/__tests__/helpers/renderList.spec.ts | 6 ++++++
 packages/runtime-core/src/helpers/renderList.ts            | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-core/__tests__/helpers/renderList.spec.ts b/packages/runtime-core/__tests__/helpers/renderList.spec.ts
index d55bffbd8d..e28c6a004c 100644
--- a/packages/runtime-core/__tests__/helpers/renderList.spec.ts
+++ b/packages/runtime-core/__tests__/helpers/renderList.spec.ts
@@ -41,4 +41,10 @@ describe('renderList', () => {
       renderList(iterable(), (item, index) => `node ${index}: ${item}`)
     ).toEqual(['node 0: 1', 'node 1: 2', 'node 2: 3'])
   })
+
+  it('should return empty array when source is undefined', () => {
+    expect(
+      renderList(undefined, (item, index) => `node ${index}: ${item}`)
+    ).toEqual([])
+  })
 })
diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index 693c87bcba..f45020d418 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -31,6 +31,8 @@ export function renderList(
         ret[i] = renderItem(source[key], key, i)
       }
     }
+  } else {
+    ret = []
   }
-  return ret!
+  return ret
 }
-- 
2.47.3