From 7827ff85e0a8ecef3c2cd3598a82b0bf4ba868a3 Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Sun, 14 Jul 2019 04:02:24 +0900
Subject: [PATCH] Update CONTRIBUTING.md

---
 CONTRIBUTING.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ea427b2c0..1d88812f7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -79,6 +79,20 @@ Good:
 if (foo) bar;
 ```
 
+### 特別な理由がない限り`===`を使う
+🥰
+
+### null系を除いて、bool以外の値をifに渡さない
+Bad:
+``` ts
+if (foo.length)
+```
+
+Good:
+``` ts
+if (foo.length > 0)
+```
+
 ### `export default`を使わない
 インテリセンスと相性が悪かったりするため