node.js - next.js + expo：您可能忘记从定义组件的文件中导出组件，或者您可能混淆了默认导入和命名导入

Question

当我尝试运行时yarn ios，我得到：

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `MyApp`.

但是我的App.tsx, 有：

class MyApp extends App {


  render() {
    const { Component, pageProps } = this.props;
    return (
      <ThemeProvider theme={theme}>
        <ScrollView>
          <Component {...pageProps} />
        </ScrollView>
        <FooterBar />
      </ThemeProvider>
    )
  }
}

export default MyApp

所以我不确定它在抱怨什么？

标签： node.jsreactjsexponext.js

Answer 1

您很可能没有在 this.props.Component 中传递任何内容。Javascript 相当棘手，如果元素不存在，它会将其视为未定义