From ed09cb765019a9052b444ea036dc17027133b8eb Mon Sep 17 00:00:00 2001
From: Alec Larson <1925840+aleclarson@users.noreply.github.com>
Date: Tue, 20 Jul 2021 20:51:37 -0400
Subject: [PATCH] fix(sourcemap): ensure `sources` and `sourcesContent` are the
 same length

---
 packages/vite/src/node/server/sourcemap.ts | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/packages/vite/src/node/server/sourcemap.ts b/packages/vite/src/node/server/sourcemap.ts
index abfbc5c82ec45e..515b5a605a3157 100644
--- a/packages/vite/src/node/server/sourcemap.ts
+++ b/packages/vite/src/node/server/sourcemap.ts
@@ -29,15 +29,18 @@ export async function injectSourcesContent(
 
   const missingSources: string[] = []
   map.sourcesContent = await Promise.all(
-    map.sources.filter(Boolean).map((sourcePath) => {
-      sourcePath = decodeURI(sourcePath)
-      if (sourceRoot) {
-        sourcePath = path.resolve(sourceRoot, sourcePath)
+    map.sources.map((sourcePath) => {
+      if (sourcePath) {
+        sourcePath = decodeURI(sourcePath)
+        if (sourceRoot) {
+          sourcePath = path.resolve(sourceRoot, sourcePath)
+        }
+        return fs.readFile(sourcePath, 'utf-8').catch(() => {
+          missingSources.push(sourcePath)
+          return null
+        })
       }
-      return fs.readFile(sourcePath, 'utf-8').catch(() => {
-        missingSources.push(sourcePath)
-        return null
-      })
+      return null
     })
   )