unknown tag !<!ruby/object:Pathname> when using with react-native-unimodules

Environment

System:
    OS: macOS Mojave 10.14.6
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 37.18 MB / 16.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 12.10.0 - /var/folders/05/dbq77cwj3c5cl2r9c0qkh6h80000gn/T/yarn--1571277638840-0.6997444993602164/node
    Yarn: 1.17.3 - /var/folders/05/dbq77cwj3c5cl2r9c0qkh6h80000gn/T/yarn--1571277638840-0.6997444993602164/yarn
    npm: 6.11.3 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.0, DriverKit 19.0, macOS 10.15, tvOS 13.0, watchOS 6.0
    Android SDK:
      API Levels: 28, 29
      Build Tools: 27.0.3, 28.0.3, 29.0.0
      System Images: android-28 | Google Play Intel x86 Atom, android-29 | Google APIs Intel x86 Atom
  IDEs:
    Android Studio: 3.4 AI-183.6156.11.34.5522156
    Xcode: 11.0/11A420a - /usr/bin/xcodebuild
  npmPackages:
    react: 16.9.0 => 16.9.0 
    react-native: 0.61.1 => 0.61.1

Description

We use react-native-unimodules, which require us to add a use_unimodules! to our Podfile, and our Podfile.lock then has entries like this:

EXTERNAL SOURCES:
  appcenter:
    :path: "../node_modules/appcenter/ios"
  appcenter-analytics:
    :path: "../node_modules/appcenter-analytics/ios"
  appcenter-crashes:
    :path: "../node_modules/appcenter-crashes/ios"
  BVLinearGradient:
    :path: "../node_modules/react-native-linear-gradient"
  CodePush:
    :path: "../node_modules/react-native-code-push"
  DoubleConversion:
    :podspec: "../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec"
  EXAppLoaderProvider:
    :path: !ruby/object:Pathname
    path: "../node_modules/expo-app-loader-provider/ios"

Running react-native run-ios then results in an error:

error unknown tag !<!ruby/object:Pathname> at line 452, column 5:
        path: "../node_modules/expo-app- ... 
        ^. Run CLI with --verbose flag for more details.
YAMLException: unknown tag !<!ruby/object:Pathname> at line 452, column 5:
        path: "../node_modules/expo-app- ... 
        ^
    at generateError (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:167:10)
    at throwError (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:173:9)
    at composeNode (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1428:7)
    at readBlockMapping (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1089:11)
    at composeNode (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1359:12)
    at readBlockMapping (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1089:11)
    at composeNode (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1359:12)
    at readBlockMapping (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1089:11)
    at composeNode (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1359:12)
    at readDocument (/Users/osmanosman/Developer/mobile/node_modules/js-yaml/lib/js-yaml/loader.js:1519:3)

It seems that _warnAboutPodInstall fails on checking Podfile.lock, and the entire command fails. Commenting out that line in runIOS/index.js fixes this.

Reproducible Demo

Hopefully info above is enough, let me know if not. Note that this happens on 3.0.0-alpha* but not on 2.9.0m, which doesn’t have that check.

[Maushundb]

PR at https://github.com/react-native-community/cli/pull/810

[martinezguillaume]

For a quick fix, you can use :

  "resolutions": {
    "@react-native-community/cli-platform-ios": "2.9.0"
  }

in your package.json to force the version