Drop macOS Intel (darwin-x64) support (#8912)

* Drop macOS Intel (darwin-x64) support

ReScript 13 no longer ships binaries for Intel Macs and CI no longer
runs on macos-26-intel.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DbtRiJ2YzgzVdwgNf8Yiaz
Signed-off-by: Christoph Knittel <ck@cca.io>

* Clarify the platform package comment

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DbtRiJ2YzgzVdwgNf8Yiaz
Signed-off-by: Christoph Knittel <ck@cca.io>

* Shorten the platform package comment

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DbtRiJ2YzgzVdwgNf8Yiaz
Signed-off-by: Christoph Knittel <ck@cca.io>

---------

Signed-off-by: Christoph Knittel <ck@cca.io>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: cknitt

.github/actions/setup-ocaml/action.yml

@@ -41,10 +41,6 @@ runs:
             platform=aarch64-linux
             checksum=ba991f677edd9a21d2bc96c0144bc8ac5b112d4d98a3eb266e075e22e557df2a
             ;;
-          macOS-X64)
-            platform=x86_64-macos
-            checksum=d209fadd8a894bdaf3bd3612a23c32a0af184d2f4a979b8c789e6e4f6a4de883
-            ;;
           macOS-ARM64)
             platform=arm64-macos
             checksum=e441b48dc22163d209b4f05e44dc7210909b01237642b6c9ae48fd710a3ef83e

.github/workflows/ci.yml

@@ -53,12 +53,6 @@ jobs:
             node-target: linux-arm64
             rust-target: aarch64-unknown-linux-musl
             dune-profile: static
-          - os: macos-26-intel # x64
-            ocaml_compiler: 5.5.1
-            upload_binaries: true
-            node-target: darwin-x64
-            rust-target: x86_64-apple-darwin
-            dune-profile: release
           - os: macos-26 # ARM
             ocaml_compiler: 5.5.1
             upload_binaries: true
@@ -537,7 +531,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-26-intel
           - os: macos-26
           - os: ubuntu-26.04
           - os: ubuntu-26.04-arm
@@ -603,7 +596,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-26-intel
           - os: macos-26
           - os: ubuntu-26.04
           - os: ubuntu-26.04-arm

.github/workflows/moveArtifacts.sh

@@ -30,7 +30,6 @@ mv lib-ocaml packages/@rescript/runtime/lib/ocaml
 
 # @rescript/{target}
 chmod +x binaries-*/*.exe
-mv -f binaries-darwin-x64/* "packages/@rescript/darwin-x64/bin"
 mv -f binaries-darwin-arm64/* "packages/@rescript/darwin-arm64/bin"
 mv -f binaries-linux-x64/* "packages/@rescript/linux-x64/bin"
 mv -f binaries-linux-arm64/* "packages/@rescript/linux-arm64/bin"

Makefile

@@ -17,7 +17,7 @@ else ifeq ($(UNAME_S),Darwin)
 	ifeq ($(UNAME_M),arm64)
 		RESCRIPT_PLATFORM := darwin-arm64
 	else
-		RESCRIPT_PLATFORM := darwin-x64
+		$(error Intel Macs are not supported anymore, use ReScript 12)
 	endif
 else ifeq ($(UNAME_S),Linux)
 	ifeq ($(UNAME_M),aarch64)

changes/drop-macos-intel.breaking.md

@@ -0,0 +1 @@
+- Drop support for macOS on Intel (darwin-x64). Intel Mac users can stay on ReScript 12.

cli/common/bins.cjs

@@ -6,16 +6,14 @@
 
 const os = require("node:os");
 const path = require("node:path");
-const { getTarget } = require("./platform.cjs");
+const { getTarget, unsupportedPlatformMessage } = require("./platform.cjs");
 
 const minimumNodeVersion = "22.0.0";
 
 const target = getTarget(process.platform, process.arch, os.release());
 
 if (target === undefined) {
-  throw new Error(
-    `Platform ${process.platform}-${process.arch} is not supported!`,
-  );
+  throw new Error(unsupportedPlatformMessage(process.platform, process.arch));
 }
 
 const binPackageName = `@rescript/${target}`;

cli/common/platform.cjs

@@ -5,7 +5,6 @@
 
 const supportedTargets = [
   "darwin-arm64",
-  "darwin-x64",
   "linux-arm64",
   "linux-x64",
   "win32-x64",
@@ -32,6 +31,18 @@ function getTarget(platform, arch, osRelease) {
   return supportedTargets.includes(target) ? target : undefined;
 }
 
+/**
+ * @param {string} platform `process.platform`
+ * @param {string} arch `process.arch`
+ * @returns {string} the error for a platform without a target
+ */
+function unsupportedPlatformMessage(platform, arch) {
+  if (platform === "darwin" && arch === "x64") {
+    return "Intel Macs are not supported anymore. Use ReScript 12.";
+  }
+  return `Platform ${platform}-${arch} is not supported!`;
+}
+
 /**
  * @param {string} osRelease
  */
@@ -41,3 +52,4 @@ function windowsBuild(osRelease) {
 }
 
 exports.getTarget = getTarget;
+exports.unsupportedPlatformMessage = unsupportedPlatformMessage;

compiler/sync/dune

@@ -39,33 +39,6 @@
    (run strip -o rescript-tools.exe ../../tools/bin/main.exe)
    (run strip -o rescript.exe ../../rewatch-ocaml/rescript_ocaml.exe))))
 
-(rule
- (enabled_if
-  (and
-   (<> %{profile} browser)
-   (= %{system} macosx)
-   (= %{architecture} amd64)))
- (targets
-  bsc.exe
-  rescript-editor-analysis.exe
-  rescript-tools.exe
-  rescript.exe)
- (deps
-  ../bsc/rescript_compiler_main.exe
-  ../../analysis/bin/main.exe
-  ../../tools/bin/main.exe
-  ../../rewatch-ocaml/rescript_ocaml.exe)
- (mode
-  (promote
-   (until-clean)
-   (into ../../packages/@rescript/darwin-x64/bin)))
- (action
-  (progn
-   (run strip -o bsc.exe ../bsc/rescript_compiler_main.exe)
-   (run strip -o rescript-editor-analysis.exe ../../analysis/bin/main.exe)
-   (run strip -o rescript-tools.exe ../../tools/bin/main.exe)
-   (run strip -o rescript.exe ../../rewatch-ocaml/rescript_ocaml.exe))))
-
 (rule
  (enabled_if
   (and

package.json

@@ -89,7 +89,6 @@
   },
   "optionalDependencies": {
     "@rescript/darwin-arm64": "workspace:packages/@rescript/darwin-arm64",
-    "@rescript/darwin-x64": "workspace:packages/@rescript/darwin-x64",
     "@rescript/linux-arm64": "workspace:packages/@rescript/linux-arm64",
     "@rescript/linux-x64": "workspace:packages/@rescript/linux-x64",
     "@rescript/win32-x64": "workspace:packages/@rescript/win32-x64"