React - TypeError: Cannot set property 'props' of undefined

Question

I am trying to learn class components and I have done something wrong but don't know what.

import React from "react"

class App extends React.Component() {
    constructor() {
        super()
        this.state = {
            name: "test",
            age: 31
        }
    }
    
    render() {
        return (
            <div>
                <h1>{this.state.name}</h1>
                <h3>{this.state.age} years old</h3>
            </div>
        )    
    }
}
export default App

And this is the error

TypeError: Class extends value undefined is not a constructor or null

Answer 1

You were extending React.Component() it should be React.Component

class App extends React.Component {
  constructor() {
    super();
    this.state = {
      name: "test",
      age: 31
    };
  }

  render() {
    return (
      <div>
        <h1>{this.state.name}</h1>
        <h3>{this.state.age} years old</h3>
      </div>
    );
  }
}
export default App;