From 9f68c698cc3442425b57c43a95868fa4d386aadc Mon Sep 17 00:00:00 2001
From: Guy Bedford <gbedford@cloudflare.com>
Date: Wed, 20 May 2026 11:00:08 -0700
Subject: [PATCH] fix(install): use prebuilt wasm-bindgen binary on macOS
 aarch64

Previously wasm-pack built wasm-bindgen-cli from source on Apple Silicon
because the macOS aarch64 match arm only covered cargo-generate and
wasm-opt. wasm-bindgen publishes an aarch64-apple-darwin tarball for
every release, so fall through to that target for any tool other than
wasm-opt (which uses the binaryen 'arm64-macos' naming).

Also enable the can_download_prebuilt_wasm_bindgen test on
macos/aarch64 so the new code path is exercised in CI.

Fixes #1581
---
 CHANGELOG.md          | 9 +++++++++
 src/install/mod.rs    | 2 +-
 tests/all/download.rs | 1 +
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed9dd567..9d92e222 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,15 @@
 
 ## 🤍 Unreleased
 
+- ### 🤕 Fixes
+
+  - **Use prebuilt wasm-bindgen binary on macOS aarch64 - [guybedford], [pull/1585]**
+
+    Previously wasm-pack built `wasm-bindgen-cli` from source on Apple Silicon. The
+    prebuilt `aarch64-apple-darwin` release is now used directly.
+
+    [pull/1585]: https://github.com/wasm-bindgen/wasm-pack/pull/1585
+
 ## 🌷 0.15.0
 
 - ### ✨ Features
diff --git a/src/install/mod.rs b/src/install/mod.rs
index c0feb0ef..8f3b5468 100644
--- a/src/install/mod.rs
+++ b/src/install/mod.rs
@@ -180,8 +180,8 @@ pub fn prebuilt_url_for(tool: &Tool, version: &str, arch: &Arch, os: &Os) -> Res
         (Os::Linux, Arch::X86_64, _) => "x86_64-unknown-linux-musl",
         (Os::MacOS, Arch::X86_64, Tool::WasmOpt) => "x86_64-macos",
         (Os::MacOS, Arch::X86_64, _) => "x86_64-apple-darwin",
-        (Os::MacOS, Arch::AArch64, Tool::CargoGenerate) => "aarch64-apple-darwin",
         (Os::MacOS, Arch::AArch64, Tool::WasmOpt) => "arm64-macos",
+        (Os::MacOS, Arch::AArch64, _) => "aarch64-apple-darwin",
         (Os::Windows, Arch::X86_64, Tool::WasmOpt) => "x86_64-windows",
         (Os::Windows, Arch::X86_64, _) => "x86_64-pc-windows-msvc",
         _ => bail!("Unrecognized target!"),
diff --git a/tests/all/download.rs b/tests/all/download.rs
index 7042daac..ebf040ad 100644
--- a/tests/all/download.rs
+++ b/tests/all/download.rs
@@ -4,6 +4,7 @@ use wasm_pack::install::{self, Arch, Os, Tool};
 #[cfg(any(
     all(target_os = "linux", target_arch = "x86_64"),
     all(target_os = "macos", target_arch = "x86_64"),
+    all(target_os = "macos", target_arch = "aarch64"),
     all(windows, target_arch = "x86_64"),
 ))]
 fn can_download_prebuilt_wasm_bindgen() {