transform.forEach is not a function. (In 'transform.forEach', 'transform.forEach' is undefined)

[iwangx]

Description

When prompted to start "transform.forEach is not a function".Log as shown below.

2017-06-21 10:43:59.220 [error][tid:com.facebook.React.JavaScript] transform.forEach is not a function. (In 'transform.forEach', 'transform.forEach' is undefined)
2017-06-21 10:43:59.224 [fatal][tid:com.facebook.react.ExceptionsManagerQueue] Unhandled JS Exception: transform.forEach is not a function. (In 'transform.forEach', 'transform.forEach' is undefined)

Reproduction Steps

react-native start

Sample Code

import React, { Component } from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    View
} from 'react-native';

export default class HelloWorld extends Component {
    render() {
        return (
            <View style={styles.container}>
              <Text style={styles.welcome}>
                Welcome to React Native!
              </Text>
              <Text style={styles.instructions}>
                To get started, edit index.ios.js
              </Text>
              <Text style={styles.instructions}>
                Press Cmd+R to reload,{'\n'}
                Cmd+D or shake for dev menu
              </Text>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#F5FCFF',
    },
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10,
    },
    instructions: {
        textAlign: 'center',
        color: '#333333',
        marginBottom: 5,
    },
});

AppRegistry.registerComponent('HelloWorld', () => HelloWorld);

Solution

The 119 line in the following file, transform, may be a variable of type bool

/node_modules/react-native/Libraries/StyleSheet/processTransform.js

Additional Information

• React Native version:"react": "16.0.0-alpha.12", "react-native": "0.45.1"
• Platform: iOS
• Development Operating System: macOS
• Build tools: Xcode

[mikelambert]

Looks like a dupe of #13765. Posted a fix in #13765 (comment)

[iwangx]

@mikelambert
I solved the problem by installing the application using yarn

npm install -g yarn react-native-cli

yarn install