From 7408a33be79967a049f82edd97b58001b1e23b34 Mon Sep 17 00:00:00 2001
From: Rick Wong <RickWong@users.noreply.github.com>
Date: Mon, 20 Oct 2025 18:20:46 +0200
Subject: [PATCH] Removed wasm rel-preload link from bundle index.html to save
 bandwidth for Safari users (#4796)

---
 packages/cli/src/build/request.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/cli/src/build/request.rs b/packages/cli/src/build/request.rs
index 09fb4967e..1be64e07e 100644
--- a/packages/cli/src/build/request.rs
+++ b/packages/cli/src/build/request.rs
@@ -4826,10 +4826,10 @@ __wbg_init({{module_or_path: "/{}/{wasm_path}"}}).then((wasm) => {{
             }
         }
 
-        // Manually inject the wasm file for preloading. WASM currently doesn't support preloading in the manganis asset system
-        head_resources.push_str(&format!(
-            "<link rel=\"preload\" as=\"fetch\" type=\"application/wasm\" href=\"/{{base_path}}/{wasm_path}\" crossorigin>"
-        ));
+        // Do not preload the wasm file, because in Safari, preload as=fetch requires additional fetch() options to exactly match the network request
+        // And if they do not match then Safari downloads the wasm file twice.
+        // See https://github.com/wasm-bindgen/wasm-bindgen/blob/ac51055a4c39fa0affe02f7b63fb1d4c9b3ddfaf/crates/cli-support/src/js/mod.rs#L967
+        
         Self::replace_or_insert_before("{style_include}", "</head", &head_resources, html);
 
         Ok(())