From 356b9599134242c9f0261a44a5fb7611fac018d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jozef=20Steinh=C3=BCbl?= <xhyrom.hyro@gmail.com>
Date: Thu, 10 Jul 2025 20:28:16 +0200
Subject: [PATCH] feat: add warning message for windows arm64 fallback to x64

---
 src/action.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/action.ts b/src/action.ts
index 5cc9867..bf42772 100644
--- a/src/action.ts
+++ b/src/action.ts
@@ -158,6 +158,15 @@ function isCacheEnabled(options: Input): boolean {
 function getEffectiveArch(os: string, arch: string): string {
   // Temporary workaround for absence of arm64 builds on Windows (#130)
   if (os === "win32" && arch === "arm64") {
+    warning(
+      [
+        "⚠️ Bun does not provide native arm64 builds for Windows.",
+        "Using x64 build which will run through Microsoft's x64 emulation layer.",
+        "This may result in reduced performance and potential compatibility issues.",
+        "💡 For best performance, consider using x64 Windows runners or other platforms with native arm64 support.",
+      ].join("\n"),
+    );
+
     return "x64";
   }