0.50.0-rc.2 not working with axios in release build

Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment: OS: macOS High Sierra 10.13 Node: 8.8.1 Yarn: 1.2.1 npm: 5.4.2 Watchman: 4.9.0 Xcode: Xcode 9.0.1 Build version 9A1004 Android Studio: 2.3 AI-162.4069837

Packages: (wanted => installed) react: 16.0.0 => 16.0.0 react-native: 0.50.0-rc.2 => 0.50.0-rc.2

Steps to Reproduce

After upgrading my project to RN 0.50.0-rc.2, all axios call stopped working in release build (they work well in development build and RN 0.49.5).

    try {
      const res = await axios.get('/news', {
        params: { limit: 20, offset: 0 }
      })
      console.log(res)
    } catch (error) {
      window.alert(error)
    }

I got this exception:

This only happens on RN 0.50.0-rc.2 & production build.

After I changed this line in axios to if (true) { then it works again in production build. I don’t know why the assertion failed in production build. When I use window.alert(typeof XMLHttpRequest) in my own code it outputs ‘function’, but it outputs ‘undefined’ in axios code.

[Manweill]

@alimek Yes, it’s ok in rn 0.50.3。

[alimek]

@Manweill in package.json. Anyway you can try update RN to version 0.50.3, they are saying that its fixed, but haven’t tried it yet.