Issue encountered during Expo managed app iOS build: "Encountered error: Unable to read property 'transformFile' of undefined."

I'm currently developing a managed expo app and utilizing eas services. When attempting to create an internal distribution build, the process is successful on Android, but on iOS, the build fails with the following error:

Metro encountered an error:
Cannot read property 'transformFile' of undefined
▸   PhaseScriptExecution Bundle\ React\ Native\ code\ and\ images /Users/expo/Library/Developer/Xcode/DerivedData/greengot-djveyphpwyosjubjkipdmcftptmp/Build/Intermediates.noindex/ArchiveIntermediates/greengot/IntermediateBuildFilesPath/greengot.build/Debug-iphoneos/greengot.build/Script-00DD1BFF1BD5951E006B06BC.sh

The versions I am using are as follows:
"expo": "^41.0.0"
"react": "^17.0.2"
"react-native": "https://github.com/expo/react-native/archive/sdk-41.0.0.tar.gz"

Below is the fastlane step:

    Creating Gymfile
    Gymfile created
    Successfully loaded '/Users/expo/workingdir/build/ios/Gymfile' 📄
    +-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
    |                                                                  Detected Values from './Gymfile'                                                                   |
    +-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
    | suppress_xcode_output | true                                                                                                                                        |
    | clean                 | false                                                                                                                                       |
    | scheme                | greengot                                                                                                                                    |
    | configuration         | Debug                                                                                                                                       |
    | export_options        |                                                                                                                                             |
    | export_xcargs         | OTHER_CODE_SIGN_FLAGS="--keychain /var/folders/97/73j93h690g9gdn54bh_zskm40000gn/T/turtle-v2-7e963dc1-4490-447d-a422-5fbf97c2632f.keychain" |
    | disable_xcpretty      | true                                                                                                                                        |
    | buildlog_path         | /Users/expo/workingdir/logs                                                                                                                 |
    | output_directory      | ./build                                                                                                                                     |
    +-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
    ... (additional fastlane step details)

Furthermore, the iOS log contains the following error:

                    Welcome to Metro!
              Fast - Scalable - Integrated
Failed to construct transformer:  TypeError: Transformer is not a constructor
    at getTransformCacheKey (/Users/expo/workingdir/build/node_modules/metro/src/DeltaBundler/Transformer/getTransformCacheKey.js:33:31)
    ... (more errors)

I want to highlight that expo-updates is not included in my dependencies. Do you have any insights on how to resolve this error?

javascriptiosreact-nativebuildexpo

Answer №1

To solve the issue, it is recommended to delete the node module and package-lock.json files. Afterward, you can proceed with reinstalling them using the command npm install and attempt to build the project once more.

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