From acf3a14ba357e330a6d207865edb9f9e078c7d56 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ari=20Perkki=C3=B6?= <ari.perkkio@gmail.com>
Date: Thu, 30 Mar 2023 14:11:44 +0300
Subject: [PATCH] perf: improve isFileReadable performance (#12397)

---
 packages/vite/src/node/utils.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/vite/src/node/utils.ts b/packages/vite/src/node/utils.ts
index a266c8cd661d29..68f26d95cf18cc 100644
--- a/packages/vite/src/node/utils.ts
+++ b/packages/vite/src/node/utils.ts
@@ -501,7 +501,14 @@ export function generateCodeFrame(
 
 export function isFileReadable(filename: string): boolean {
   try {
+    // The "throwIfNoEntry" is a performance optimization for cases where the file does not exist
+    if (!fs.statSync(filename, { throwIfNoEntry: false })) {
+      return false
+    }
+
+    // Check if current process has read permission to the file
     fs.accessSync(filename, fs.constants.R_OK)
+
     return true
   } catch {
     return false