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React Nativeで新しいビルドシステムを使いたい

CocoaPodsを使っているReact Nativeプロジェクトで、Multiple commands produceというエラーが出てXcode上でプロジェクトのビルドができない時がある。
https://github.com/facebook/react-native/issues/20492
ここに書いてあるとおり、

  post_install do |installer|
    installer.pods_project.targets.each do |target|

      # The following is needed to ensure the "archive" step works in XCode.
      # It removes React & Yoga from the Pods project, as it is already included in the main project.
      # Without this, you'd see errors when you archive like:
      # "Multiple commands produce ... libReact.a"
      # "Multiple commands produce ... libyoga.a"

      targets_to_ignore = %w(React yoga)

      if targets_to_ignore.include? target.name
        target.remove_from_project
      end

    end
  end

この行をPodfileに追加したら動くようになった。

pod install

も忘れずに。

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