From 182795d75ebd767fe67c2585d8537ba1d6c34d7c Mon Sep 17 00:00:00 2001
From: ygj6 <yuangongji@foxmail.com>
Date: Tue, 27 Apr 2021 14:11:02 +0800
Subject: [PATCH] fix(dev): strip utf-8 bom (#3162)

---
 packages/vite/src/node/plugins/importAnalysis.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/vite/src/node/plugins/importAnalysis.ts b/packages/vite/src/node/plugins/importAnalysis.ts
index 040558b9f79645..cf83bdb6419e2d 100644
--- a/packages/vite/src/node/plugins/importAnalysis.ts
+++ b/packages/vite/src/node/plugins/importAnalysis.ts
@@ -112,6 +112,10 @@ export function importAnalysisPlugin(config: ResolvedConfig): Plugin {
       const rewriteStart = Date.now()
       await init
       let imports: readonly ImportSpecifier[] = []
+      // strip UTF-8 BOM
+      if (source.charCodeAt(0) === 0xfeff) {
+        source = source.slice(1)
+      }
       try {
         imports = parseImports(source)[0]
       } catch (e) {