From 80f405ec22cb589d6ba5a52f7b7d8e8ed71ad1ff Mon Sep 17 00:00:00 2001
From: bluwy <bjornlu.dev@gmail.com>
Date: Tue, 20 Dec 2022 21:36:11 +0800
Subject: [PATCH] perf(resolve): reduce ts check regex run

---
 packages/vite/src/node/plugins/resolve.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/vite/src/node/plugins/resolve.ts b/packages/vite/src/node/plugins/resolve.ts
index 1cba88d3f68a42..8e029baf0fa907 100644
--- a/packages/vite/src/node/plugins/resolve.ts
+++ b/packages/vite/src/node/plugins/resolve.ts
@@ -529,6 +529,7 @@ function tryResolveFile(
   targetWeb: boolean,
   tryPrefix?: string,
   skipPackageJson?: boolean,
+  skipTsExtension?: boolean,
 ): string | undefined {
   const stat = fs.statSync(file, { throwIfNoEntry: false })
   if (stat) {
@@ -553,8 +554,12 @@ function tryResolveFile(
     }
   }
 
-  const tryTsExtension = options.isFromTsImporter && isPossibleTsOutput(file)
-  if (tryTsExtension) {
+  // try resolve .js import to typescript file
+  if (
+    !skipTsExtension &&
+    options.isFromTsImporter &&
+    isPossibleTsOutput(file)
+  ) {
     const tsSrcPaths = getPotentialTsSrcPaths(file)
     for (const srcPath of tsSrcPaths) {
       const res = tryResolveFile(
@@ -565,6 +570,7 @@ function tryResolveFile(
         targetWeb,
         tryPrefix,
         skipPackageJson,
+        true,
       )
       if (res) return res
     }