Is this a bug report?

Yes.

Have you read the Contributing Guidelines?

Yes.

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 8.4.0
Yarn: 1.0.1
npm: 4.6.1
Watchman: 4.9.0
Xcode: Xcode 9.0 Build version 9A235
Android Studio: 2.3 AI-162.4069837

Packages: (wanted => installed)
react: ^16.0.0-beta.5 => 16.0.0-beta.5
react-native: 0.49.3 => 0.49.3

Steps to Reproduce

1. Run an app with the following code on your Android device:

import React, { Component } from 'react';
import { ViewPagerAndroid } from 'react-native';

const Page = () => <View />;

const Pager = ({children}) => <ViewPagerAndroid>{children}</ViewPagerAndroid>;

export default class App extends Component {
  render() {
    return (
      <Pager>
        <Page />
        <Page />
      </Pager>
    );
  }
}

2. Observe warning.

Expected Behavior

There should be no warning as Page renders a View.

Actual Behavior

Warning:

Each ViewPager child must be a <View>. Was Page.

Reproducible Demo

Unavailable. Issue exists on RN 0.49. Expo SDK 21 uses 0.48.