I have recently upgraded my app from SDK 40 to SDK 44 and came across this error App.js: [BABEL]: Unexpected token '.' (While processing: /Users/user/path/to/project/node_modules/babel-preset-expo/index.js)

Error Stack Trace:

App.js: [BABEL]: Unexpected token '.' (While processing: /Users/user/path/to/project/node_modules/babel-preset-expo/index.js)
/Users/user/path/to/project/node_modules/babel-preset-expo/index.js:48
        ...(options?.jsxRuntime !== 'classic' && {
                    ^

SyntaxError: Unexpected token '.'
    at wrapSafe (internal/modules/cjs/loader.js:931:16)
    at Module._compile (internal/modules/cjs/loader.js:979:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)
    at Module.load (internal/modules/cjs/loader.js:879:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:903:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at loadCjsDefault (/Users/user/path/to/project/node_modules/@babel/core/lib/config/files/module-types.js:85:18)
    at loadCjsOrMjsDefault (/Users/user/path/to/project/node_modules/@babel/core/lib/config/files/module-types.js:57:16)

Here is my babel.config.js:

return {
    presets: ['babel-preset-expo', { jsxRuntime: 'automatic' }],
    plugins: [
        ['inline-dotenv'],
        ['.....']
    ]
}

Here is my package.json:

{
    "main": "node_modules/expo/AppEntry.js",
    "scripts": {
        "start": "expo start",
        "android": "expo start --android",
        "ios": "expo start --ios",
        "web": "expo start --web",
        "eject": "expo eject",
        "test": "jest"
    },
    "jest": {
        "preset": "jest-expo"
    },
    "dependencies": {
        "@babel/plugin-transform-react-jsx": "^7.16.5",
        "@react-native-async-storage/async-storage": "~1.15.0",
        "@react-native-community/art": "^1.2.0",
        "@react-native-community/datetimepicker": "4.0.0",
        "@react-native-community/masked-view": "0.1.10",
        "@react-native-community/netinfo": "7.1.3",
        "@react-native-community/push-notification-ios": "^1.2.2",
        "@react-native-community/slider": "4.1.12",
        "@react-navigation/native": "^5.1.4",
        "aws-amplify": "^3.3.1",
        "aws-amplify-react-native": "^4.2.6",
        "axios": "^0.19.2",
        "expo": "^44.0.0",
        "expo-app-loading": "~1.3.0",
        "expo-barcode-scanner": "~11.2.0",
        "expo-camera": "~12.1.0",
        "expo-constants": "~13.0.0",
        "expo-font": "~10.0.4",
        "expo-linking": "~3.0.0",
        "expo-mail-composer": "~11.1.0",
        "expo-notifications": "~0.14.0",
        "expo-permissions": "~13.1.0",
        "expo-secure-store": "~11.1.0",
        "expo-sqlite": "~10.1.0",
        "expo-updates": "~0.11.2",
        "expo-web-browser": "~10.1.0",
        "file-saver": "^2.0.2",
        "jsbarcode": "^3.11.3",
        "link": "^0.1.5",
        "metro-config": "^0.64.0",
        "npm": "^8.3.0",
        "qs": "^6.9.4",
        "react": "17.0.1",
        "react-dom": "17.0.1",
        "react-native": "https://github.com/expo/react-native/archive/sdk-44.0.0.tar.gz",
        "react-native-barcode-expo": "^1.1.1",
        "react-native-elements": "^3.2.0",
        "react-native-fs": "^2.16.6",
        "react-native-gesture-handler": "~2.1.0",
        "react-native-modal": "^11.5.6",
        "react-native-modal-datetime-picker": "^8.6.0",
        "react-native-paper": "^3.10.1",
        "react-native-push-notification": "^3.5.2",
        "react-native-reanimated": "~2.3.1",
        "react-native-router-flux": "^4.2.0",
        "react-native-safe-area-context": "3.3.2",
        "react-native-screens": "~3.10.1",
        "react-native-snap-carousel": "^3.9.1",
        "react-native-svg": "12.1.1",
        "react-native-web": "0.17.1",
        "react-navigation-animated-switch": "^0.6.4",
        "react-navigation-drawer": "^2.4.11",
        "react-navigation-header-buttons": "^3.0.5",
        "react-router-dom": "^6.0.0-alpha.3",
        "yarn": "^1.22.17"
    },
    "devDependencies": {
        "@babel/core": "^7.12.9",
        "@babel/runtime": "^7.9.2",
        "@react-native-community/eslint-config": "^0.0.7",
        "babel-jest": "^25.1.0",
        "babel-plugin-inline-dotenv": "^1.6.0",
        "babel-preset-expo": "9.0.1",
        "eslint": "^6.8.0",
        "expo-cli": "^5.0.2",
        "jest": "^26.6.3",
        "jest-expo": "^44.0.0",
        "metro-react-native-babel-preset": "^0.66.2",
        "react-test-renderer": "^16.13.1"
    },
    "private": true
}

Any help will be greatly appreciated.

CodePudding user response：

can you give your

• package.json
• node version

I think that's because of the babel issue / your node version, because it cannot transpile the optional chaining https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining

maybe tried using latest LTS node version? because as far as I know, the latest LTS node version already support optional chaining

CodePudding user response：

From what I can see, Expo SDK 44 is still in beta.

The Error Stack Trace reads that newer syntax (in this case the optional chaining operator ?.) isn't being transpiled by Babel which causes the failure.

Simply downgrading to the stable SDK 43 should solve all issues.

P.S: This error has been reported to Expo already by the beta testers.