From 2f69167e889f2817138629a04c01c6baf565d485 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 7 May 2020 09:38:49 -0400
Subject: [PATCH] perf(compiler-sfc): only add character mapping if not
 whitespace

---
 packages/compiler-sfc/src/parse.ts | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/packages/compiler-sfc/src/parse.ts b/packages/compiler-sfc/src/parse.ts
index cc6e4a8e22..4b1c972f8d 100644
--- a/packages/compiler-sfc/src/parse.ts
+++ b/packages/compiler-sfc/src/parse.ts
@@ -258,17 +258,19 @@ function generateSourceMap(
       const originalLine = index + 1 + lineOffset
       const generatedLine = index + 1
       for (let i = 0; i < line.length; i++) {
-        map.addMapping({
-          source: filename,
-          original: {
-            line: originalLine,
-            column: i
-          },
-          generated: {
-            line: generatedLine,
-            column: i
-          }
-        })
+        if (!/\s/.test(line[i])) {
+          map.addMapping({
+            source: filename,
+            original: {
+              line: originalLine,
+              column: i
+            },
+            generated: {
+              line: generatedLine,
+              column: i
+            }
+          })
+        }
       }
     }
   })
-- 
2.47.3