Unable to construct a new Blob()

[cshfang]

Description

After creating a React Native app with the new architecture enabled, using the global Blob() constructor resulted in the following error: Invariant Violation: NativeBlobModule is available. This was reproducible in the following combinations:

Platform	React Native version	New architecture enabled?	Blob() available?
iOS	0.70.3	Yes	❌
Android	0.70.3	Yes	✅
iOS	0.68.4	Yes	❌
iOS	0.70.3	No	✅
Android	0.70.3	No	✅
iOS	0.68.4	No	✅

As a result of this global Blob() being unavailable, the blob() method in whatwg-fetch polyfill is also now missing from Requests/Responses since the library first checks for Blob support.

Version

0.70.3, 0.68-stable

Output of npx react-native info

info Fetching system and libraries information... System: OS: macOS 12.5.1 CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz Memory: 2.47 GB / 16.00 GB Shell: 5.8.1 - /bin/zsh Binaries: Node: 16.18.0 - ~/.nvm/versions/node/v16.18.0/bin/node Yarn: 1.22.17 - ~/.yarn/bin/yarn npm: 8.19.2 - ~/.nvm/versions/node/v16.18.0/bin/npm Watchman: 4.9.0 - /usr/local/bin/watchman Managers: CocoaPods: 1.11.3 - /usr/local/bin/pod SDKs: iOS SDK: Platforms: DriverKit 21.4, iOS 16.0, macOS 12.3, tvOS 16.0, watchOS 9.0 Android SDK: API Levels: 28, 30, 31, 32 Build Tools: 28.0.3, 29.0.2, 30.0.2, 30.0.3, 31.0.0 System Images: android-30 | Google APIs Intel x86 Atom Android NDK: Not Found IDEs: Android Studio: 2021.3 AI-213.7172.25.2113.9123335 Xcode: 14.0.1/14A400 - /usr/bin/xcodebuild Languages: Java: 12.0.2 - /Library/Java/JavaVirtualMachines/jdk-12.0.2.jdk/Contents/Home/bin/javac npmPackages: @react-native-community/cli: Not Found react: 18.1.0 => 18.1.0 react-native: 0.70.3 => 0.70.3 react-native-macos: Not Found npmGlobalPackages: react-native: Not Found

Steps to reproduce

1. Create a new React Native application via the CLI
2. Enable the new architecture
3. Try to create a new Blob()

Snack, code example, screenshot, or link to a repository

const App = () => {
  useEffect(() => {
    try {
      new Blob();
    } catch (e) {
      console.log(e); // [Invariant Violation: NativeBlobModule is available.]
    }
  });

  return null;
};

[ecreeth]

https://github.com/facebook/react-native/pull/35047

[cshfang]

Since the above PR was merged and reverted, can someone confirm that this is still being looked at for 0.71 per this comment by @cipolleschi ?

[cipolleschi]

The right fix has been merged in 0.71 (which will be released in a few weeks). From the OSS perspective, the commit looks the same, but we have to update an internal script to properly generate those lines.

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[github-actions[bot]]

This issue was closed because it has been stalled for 7 days with no activity.