TypeScript React Native Flatlist:如何为 renderItem 提供正确的项目类型? [英] TypeScript React Native Flatlist: How to give renderItem the correct type of it's item?

问题描述

我正在使用 TypeScript 构建 React Native 应用程序.renderItem 抱怨解构的项目隐式具有 any 类型.我用谷歌搜索并找到了这个问题并尝试结合 React Native 的 @types 包的 index.d.ts 中的类型来实现他们在这里教的内容.

I'm building a React Native app with TypeScript. renderItem complains that the destructured item implicitly has an any type. I googled and found this question and tried to implement what they teach here combined with the types in index.d.ts of the @types package for React Native.

export interface Props {
  emotions: Emotion[];
}

class EmotionsPicker extends PureComponent<Props> {
  keyExtractor = (item, index) => index;
  renderItem = ({ item }) => (
    <ListItem title={item.name} checkmark={item.checked} />
  );

  render() {
    return (
      <FlatList<Emotion>
        keyExtractor={this.keyExtractor}
        renderItem={this.renderItem}
        data={this.props.emotions}
      />
    );
  }
}

不幸的是，这不起作用.我如何为项目指定 Emotion 类型?

Unfortunately this does not work. How can I give item the type Emotion?

推荐答案

我找到了一个解决方案(虽然我不知道它是否理想):

I found a solution (though I don't know if it's ideal):

renderItem = ({ item }: { item: Emotion }) => (
  <ListItem title={item.name} checkmark={item.chosen} />
);

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