Object.is is undefined in Android

[thevishnupradeep]

When I try to run my JS Code in Android I get error: E/ReactNativeJS: TypeError: undefined is not a function (evaluating 'Object.is(t.tasks,this.state.tasks)')

This error comes only in Android. It works perfectly in iOS

• [x] I have reviewed the documentation
• [x] I have searched existing issues
• [ ] I am using the latest React Native version

Environment

Environment: OS: macOS High Sierra 10.13.4 Node: 9.11.1 Yarn: 1.5.1 npm: 5.6.0 Watchman: 4.9.0 Xcode: Xcode 9.3 Build version 9E145 Android Studio: 3.1 AI-173.4720617

Packages: (wanted => installed) react: 16.3.1 => 16.3.1 react-native: 0.55.3 => 0.55.3

Steps to Reproduce

Use Object.is in code.

Expected Behavior

Should just compare given objects and return a boolean value.

Actual Behavior

Gets an undefined error.

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[thevishnupradeep]

@react-native-bot The issue now contains all the relevant information

[ghost]

React native in android typically runs on older version of javascript engine than iOS so Object.is might not work by default as it's es6 feature. So, you just have to polyfill it with something like this

[pierreneter]

@bhandarijiwan but does react-native have babel? I still see it working normally with ES6 features.

[ghost]

@pierreneter It does but not everything in es6 is supported out of the box. Here is list of plugins in preset: react-native. Everything else you need supply a plugin/polyfill yourself.

[hramos]

Commented on the PR - people can use a Babel plugin as a workaround.