From dd99690c253be09de6e3b8887d5bbd0939dfba65 Mon Sep 17 00:00:00 2001
From: Amio <amio.cn@gmail.com>
Date: Tue, 14 Aug 2018 21:37:26 +0800
Subject: [PATCH] fix: TypeError when running astral on empty string

---
 lib/calc-text-width.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/calc-text-width.js b/lib/calc-text-width.js
index 9cd57ed..d477b9d 100644
--- a/lib/calc-text-width.js
+++ b/lib/calc-text-width.js
@@ -7,7 +7,7 @@ function calcWidth (charWidthTable) {
   widthTable[64] = widthTable[64] + 6 // Slightly increase width of "@" by 0.6px
 
   return function (text, astral) {
-    if (astral) text = text.match(astralRegex)
+    if (astral) text = text.match(astralRegex) || []
 
     let total = 0
     let code = 0