React @flow avoid duplicate type for this

Question

I'm using flow along with create-react-app. And sometimes it easy to use this.someFlag to setup some flags in constructor(props), but @flow yell on me. Temporary solution is using any type for this. Like so: (this: any).timerID = null; I don't really like it, because I have to use it everywhere and the code becomes whole mess. It's really not comfortable. Can I define this: any for current component somehow so I won't repeat it everytime ?

Answer 1

You can resolve this quite easily:

class MyComponent extends Component {
  myThing: number;

  constructor() {
    super();
    this.myThing = 1;
  }

  render() {
    return <div>my component</div>
  }
}

you just need to define a type on the class.