【问题标题】:global.HermesInternal - Property 'HermesInternal' does not exist on type 'Global & typeof globalThis'global.HermesInternal - 属性 'HermesInternal' 在类型 'Global & typeof globalThis' 上不存在
【发布时间】:2020-12-23 10:18:06
【问题描述】:

我有下面的代码,自动生成:

$ react-native init RepeatAloud

App.tsx

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow strict-local
 */

import React from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

const App: () => React.ReactNode = () => {
  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
        <ScrollView
          contentInsetAdjustmentBehavior="automatic"
          style={styles.scrollView}>
          <Header />
          {global.HermesInternal == null ? null : (
            <View style={styles.engine}>
              <Text style={styles.footer}>Engine: Hermes</Text>
            </View>
          )}
          <View style={styles.body}>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Step One</Text>
              <Text style={styles.sectionDescription}>
                Edit <Text style={styles.highlight}>App.js</Text> to change this
                screen and then come back to see your edits.
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>See Your Changes</Text>
              <Text style={styles.sectionDescription}>
                <ReloadInstructions />
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Debug</Text>
              <Text style={styles.sectionDescription}>
                <DebugInstructions />
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Learn More</Text>
              <Text style={styles.sectionDescription}>
                Read the docs to discover what to do next:
              </Text>
            </View>
            <LearnMoreLinks />
          </View>
        </ScrollView>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  scrollView: {
    backgroundColor: Colors.lighter,
  },
  engine: {
    position: 'absolute',
    right: 0,
  },
  body: {
    backgroundColor: Colors.white,
  },
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '600',
    color: Colors.black,
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: '400',
    color: Colors.dark,
  },
  highlight: {
    fontWeight: '700',
  },
  footer: {
    color: Colors.dark,
    fontSize: 12,
    fontWeight: '600',
    padding: 4,
    paddingRight: 12,
    textAlign: 'right',
  },
});

export default App;

我在哪里得到以下错误:

Property 'HermesInternal' does not exist on type 'Global & typeof globalThis'.

如您所见:

有什么办法可以解决吗?

谢谢!

【问题讨论】:

  • 你安装了@types/react-native吗?
  • 我遇到了同样的问题,我确实安装了@types/react-native

标签: javascript reactjs typescript react-native


【解决方案1】:

从技术上讲,您不需要它。这只是为了检查您的 Hermes 设置是否正确。为此,您可以禁用对该行的类型检查。

这里有个建议

https://github.com/react-native-community/react-native-template-typescript/pull/78/files

【讨论】:

    【解决方案2】:

    为了维护类型安全,您可以通过创建接口将HermesInternal 属性添加到现有的NodeJS.Global 类型定义中:

    interface Global extends NodeJS.Global {
      HermesInternal?: object;
    }
    

    【讨论】:

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