From ad673e12575404ee68ed267d4186de803f3dbb08 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 3 Nov 2017 16:51:16 -0400
Subject: [PATCH] chore: fix flow

---
 src/server/optimizing-compiler/optimizer.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/server/optimizing-compiler/optimizer.js b/src/server/optimizing-compiler/optimizer.js
index 92cfe22eb4a..d24acc5526a 100644
--- a/src/server/optimizing-compiler/optimizer.js
+++ b/src/server/optimizing-compiler/optimizer.js
@@ -130,11 +130,11 @@ function hasCustomDirective (node: ASTNode): ?boolean {
 
 // <select v-model> cannot be optimized because it requires a runtime check
 // to determine proper selected option
-function isSelectWithModel (node: ASTNode): ?boolean {
+function isSelectWithModel (node: ASTNode): boolean {
   return (
     node.type === 1 &&
     node.tag === 'select' &&
-    node.directives &&
+    node.directives != null &&
     node.directives.some(d => d.name === 'model')
   )
 }