From 16d05a62fff4ed4f9f3b498090f4260c8fc6a594 Mon Sep 17 00:00:00 2001
From: Yogendra Shelke <25844542+YogendraShelke@users.noreply.github.com>
Date: Wed, 22 Jul 2026 18:33:40 +0530
Subject: [PATCH] add simslim to boost ios sim

---
 .github/scripts/launch-ios-simulator.sh | 12 ++++++++++
 .github/workflows/ios.yml               | 29 ++++++++++++++++++++++++-
 example/package.json                    |  2 +-
 3 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/.github/scripts/launch-ios-simulator.sh b/.github/scripts/launch-ios-simulator.sh
index 0752b82..6269ddc 100755
--- a/.github/scripts/launch-ios-simulator.sh
+++ b/.github/scripts/launch-ios-simulator.sh
@@ -65,6 +65,18 @@ if pgrep -x "Simulator" > /dev/null; then
     sleep 2
 fi
 
+# `killall Simulator` only closes the UI app; simctl-booted devices keep running.
+# Any leftover booted device makes `xcrun simctl <cmd> booted` ambiguous, so shut
+# them all down before booting the one we actually want.
+BOOTED_DEVICES=$(xcrun simctl list devices --json | \
+    jq -r '.devices[] | .[] | select(.state == "Booted") | "\(.name) (\(.udid))"')
+if [ -n "$BOOTED_DEVICES" ]; then
+    log_warning "Found booted simulator(s), shutting down for a clean state:"
+    printf '  %s\n' "$BOOTED_DEVICES"
+    xcrun simctl shutdown all 2>/dev/null || true
+    sleep 2
+fi
+
 # Find the device UDID
 log_info "Finding device UDID for '$DEVICE_NAME' with iOS $OS_VERSION..."
 
diff --git a/.github/workflows/ios.yml b/.github/workflows/ios.yml
index bae9dc6..9c75c8c 100644
--- a/.github/workflows/ios.yml
+++ b/.github/workflows/ios.yml
@@ -47,6 +47,31 @@ jobs:
         working-directory: example
         run: yarn pod
 
+      - name: "Optimize simulator with simslim"
+        run: |
+          if ! command -v jq &> /dev/null; then
+            brew install jq
+          fi
+          brew install mobai-app/tap/simslim
+
+          # Only optimize the exact device+runtime used for testing (saves ~3-4 min vs
+          # optimizing all simulators). Several runtimes expose the same device name, so
+          # both the name AND the OS version must match, otherwise we slim a simulator
+          # the tests never use.
+          UDID=$(simslim list --json | jq -r \
+            --arg name "${{ env.DEVICE_MODEL }}" --arg os "${{ env.IOS_VERSION }}" \
+            'first(.[] | select(.name == $name and (.osVersion == $os or (.osVersion | startswith($os + ".")))) | .udid) // empty')
+
+          if [ -n "$UDID" ]; then
+            echo "Optimizing ${{ env.DEVICE_MODEL }} (iOS ${{ env.IOS_VERSION }}) - $UDID..."
+            # --preserve-boot-state leaves the simulator shut down afterwards. The slim
+            # config persists in launchd overrides, and leaving a second simulator booted
+            # makes `simctl <cmd> booted` ambiguous in later steps.
+            simslim --boot-timeout 15m on --preserve-boot-state "$UDID"
+          else
+            echo "::warning::${{ env.DEVICE_MODEL }} with iOS ${{ env.IOS_VERSION }} not found, skipping simslim optimization"
+          fi
+
       # Build iOS app (only if not cached)
       - name: Build iOS app for simulator
         if: steps.cache-ios-app.outputs.cache-hit != 'true'
@@ -84,4 +109,6 @@ jobs:
       # Run tests
       - name: Run Harness E2E tests
         working-directory: example
-        run: yarn harness:ios
+        run: |
+          export NODE_OPTIONS="--max-old-space-size=6144"
+          yarn harness:ios
diff --git a/example/package.json b/example/package.json
index eafae15..293313a 100644
--- a/example/package.json
+++ b/example/package.json
@@ -10,7 +10,7 @@
     "build:ios": "react-native build-ios --mode Debug",
     "pod": "bundle install && bundle exec pod install --project-directory=ios",
     "app:package:ios": "xcodebuild -workspace ios/MendixNativeExample.xcworkspace -scheme MendixNativeExample -configuration Debug -sdk iphonesimulator -destination 'generic/platform=iOS Simulator' -derivedDataPath ios/build build",
-    "app:install:ios": "xcrun simctl install booted ios/build/Build/Products/Debug-iphonesimulator/MendixNativeExample.app",
+    "app:install:ios": "xcrun simctl install \"${SIMULATOR_UDID:-booted}\" ios/build/Build/Products/Debug-iphonesimulator/MendixNativeExample.app",
     "app:package:android": "(cd android && ./gradlew assembleDebug --no-daemon)",
     "app:install:android": "adb install -r android/app/build/outputs/apk/debug/app-debug.apk",
     "harness": "react-native-harness --verbose",