1. App.js 추가

{
	"expo": {
		"jsEngine": "hermes"
	}
}

예시
{
  "expo": {
    "name": "client",
    "slug": "client",
    **"jsEngine" : "hermes", <-- 추가**
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "bundleIdentifier": "com.rabbit.testApp",
      "supportsTablet": true,
      "buildNumber": "1.0.0"
    },
    "android": {
      "package": "com.rabbit.testApp",
      "versionCode": 1 ,
      "adaptiveIcon": {
        "foregroundImage": "./assets/adaptive-icon.png",
        "backgroundColor": "#FFFFFF"
      }
    },
    "web": {
      "favicon": "./assets/favicon.png"
    }
  }
}

2. Command Insert
* 해당 프로젝트에 진입 후 아래 명령어 실행 

$ npm install -g eas-cli
$ npm install -g eas-cli-local-build-plugin

😮‍💨  M1 Mac

iOS용 Hermes를 사용할 때 시뮬레이터용으로 빌드할 때 다음 오류가 발생할 수 있습니다.

--- a/ios/Podfile
+++ b/ios/Podfile
@@ -25,6 +25,22 @@ target 'HelloWorld' do
   post_install do |installer|
     react_native_post_install(installer)

+    # Workaround simulator build error for hermes with react-native 0.64 on mac m1 devices
+    arm_value = `/usr/sbin/sysctl -n hw.optional.arm64 2>&1`.to_i
+    has_hermes = has_pod(installer, 'hermes-engine')
+    if arm_value == 1 && has_hermes
+      projects = installer.aggregate_targets
+        .map{ |t| t.user_project }
+        .uniq{ |p| p.path }
+        .push(installer.pods_project)
+      projects.each do |project|
+        project.build_configurations.each do |config|
+          config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] = config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] + ' arm64'
+        end
+        project.save()
+      end
+    end
+
     # Workaround `Cycle inside FBReactNativeSpec` error for react-native 0.64
     # Reference: https://github.com/software-mansion/react-native-screens/issues/842#issuecomment-812543933
     installer.pods_project.targets.each do |target|

// 해결 방법
Pod를 다시 설치하고 Xcode 빌드 캐시를 정리합니다.

$ npx pod-install
$ xcodebuild clean -workspace ios/{projectName}.xcworkspace -scheme {projectName}

Android build Test Result

최적화 전 빌드 진행

최적화 후 빌드 진행