chore(metro-runtime): Use process.env.EXPO_OS platform env checks to reduce
#27636
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Co-authored-by: Expo Bot <34669131+expo-bot@users.noreply.github.com>
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…o reduce (#27636) # Why - Importing `react-native` (native or web) is heavy and can lead to places for web tree shaking to break. In root libraries such as `expo/metro-runtime` we should make all code paths as light as possible. - This change uses the `process.env.EXPO_OS` global transform to skip importing react-native at the bundle root for certain passes. --------- Co-authored-by: Expo Bot <34669131+expo-bot@users.noreply.github.com>
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Why
react-native(native or web) is heavy and can lead to places for web tree shaking to break. In root libraries such asexpo/metro-runtimewe should make all code paths as light as possible.process.env.EXPO_OSglobal transform to skip importing react-native at the bundle root for certain passes.