From: Evan You <yyx990803@gmail.com>
Date: Thu, 14 Nov 2019 16:50:16 +0000 (-0500)
Subject: fix: handle empty lines in codeframe
X-Git-Tag: v3.0.0-alpha.0~198
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4b2610c46820007f26b7bbce962180483bd6444e;p=thirdparty%2Fvuejs%2Fcore.git

fix: handle empty lines in codeframe
---

diff --git a/packages/shared/src/codeframe.ts b/packages/shared/src/codeframe.ts
index 3ffb2808ac..890675432c 100644
--- a/packages/shared/src/codeframe.ts
+++ b/packages/shared/src/codeframe.ts
@@ -20,7 +20,10 @@ export function generateCodeFrame(
         if (j === i) {
           // push underline
           const pad = start - (count - lineLength) + 1
-          const length = end > count ? lineLength - pad : end - start
+          const length = Math.max(
+            0,
+            end > count ? lineLength - pad : end - start
+          )
           res.push(`   |  ` + ' '.repeat(pad) + '^'.repeat(length))
         } else if (j > i) {
           if (end > count) {