invoked-without-new.jsx

// extension-js.js
export default class ExtensionJs {
  constructor() {
    console.log('ExtensionJs');
  }
}

// extension-jsx.jsx
export default class ExtensionJsx {
  constructor() {
    console.log('ExtensionJsx');
  }
}


// entry.jsx
import ExtensionJs from './extension-js';
import ExtensionJsx from './extension-jsx';


class ClassA extends ExtensionJs {
  output() {
    console.log('Success ClassA');
  }
}

const instanceClassA = new ClassA();
instanceClassA.output();// Uncaught TypeError: Class constructor ExtensionJs cannot be invoked without 'new'


class ClassB extends ExtensionJsx {
  output() {
    console.log('Success ClassB');
  }
}

const instanceClassB = new ClassB();
instanceClassB.output();// Success ClassB