From a51c254265bbfe3d77f834fe81a503ce27c05b32 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=BF=A0=20/=20green?= <green@sapphi.red>
Date: Wed, 6 Nov 2024 15:11:24 +0900
Subject: [PATCH] chore: add warning for `/` mapping in `resolve.alias`
 (#18588)

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>
---
 packages/vite/src/node/config.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index fbfda1452de235..a536058e8e1789 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -806,6 +806,16 @@ function resolveResolveOptions(
   // resolve alias with internal client alias
   const alias = normalizeAlias(mergeAlias(clientAlias, resolve?.alias || []))
   const preserveSymlinks = resolve?.preserveSymlinks ?? false
+
+  if (alias.some((a) => a.find === '/')) {
+    logger.warn(
+      colors.yellow(
+        `\`resolve.alias\` contains an alias that maps \`/\`. ` +
+          `This is not recommended as it can cause unexpected behavior when resolving paths.`,
+      ),
+    )
+  }
+
   return resolveEnvironmentResolveOptions(
     resolve,
     alias,