多个导出的语法错误，包括重命名的HOC

// math.js
export function add(a, b) { return a + b; }
export function subtract(a, b) { return a - b; }

// withLogger.js
import React from 'react';

function withLogger(WrappedComponent) {
  return class extends React.Component {
    componentDidMount() {
      console.log(`${WrappedComponent.name} mounted`);
    }
    render() {
      return <WrappedComponent {...this.props} />;
    }
  };
}

export default withLogger;

// App.js
import React from 'react';
import { add, subtract } from './math';
import withLogger from './withLogger';

function MyComponent() {
  return <div>My Component</div>;
}

const MyComponentWithLogger = withLogger(MyComponent);

function App() {
  console.log(add(2, 3)); // 输出 5
  console.log(subtract(5, 2)); // 输出 3
  return <MyComponentWithLogger />;
}

export default App;