fix: build universal binary (arm64/apple silicon)

.github/workflows/nodejs.yml

@@ -2,7 +2,7 @@ name: Node CI
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: macOS-latest
+    runs-on: macOS-11.0
     strategy:
       matrix:
         node-version: [8, 10, 12, 14, 15]
@@ -18,5 +18,10 @@ jobs:
         npm install
         npm run build --if-present
         npm test
+    - name: ensure universal binary (arm64/x86_64)
+      run: |
+        file fsevents.node
+        file fsevents.node | grep -q arm64 || (echo "arm64 binary not built"; exit 1)
+        file fsevents.node | grep -q x86_64 || (echo "x86_64 binary not built"; exit 1)
       env:
         CI: true

binding.gyp

@@ -5,9 +5,15 @@
         "target_name": "fsevents",
         "sources": [ "src/fsevents.c"],
         "xcode_settings": {
+          "OTHER_CFLAGS": [
+            "-arch x86_64",
+            "-arch arm64"
+          ],
           "OTHER_LDFLAGS": [
             "-Wl,-bind_at_load",
-            "-framework CoreFoundation -framework CoreServices"
+            "-framework CoreFoundation -framework CoreServices",
+            "-arch x86_64",
+            "-arch arm64"
           ]
         }
       }, {