expected assignment or function call: no-unused-expressions ReactJS

class Game extends Component 
{
  constructor() 
  {
    super()
    this.state = {
      speed: 0
    }
    //firebaseInit()
  }
  render()
  {
    return 
    (
      <div>
        <h1>The Score is {this.state.speed};</h1>
      </div>
    )
  }
}

export default Game;

I am new to React and for this code its giving this error

Expected an assignment or function call and instead saw an expression  no-unused-expressions

Dont understand where getting wrong, please help

This happens because you put bracket of return on the next line. That might be a common mistake if you write js without semicolons and use a style where you put opened braces on the next line.

Interpreter thinks that you return undefined and doesn't check your next line. That's the return operator thing