Flow’s interesting, unfortunately it requires more invasive changes to your code than just prop types. For example, if I remember correctly, you need a declaration for a class component’s state.
I've found more bugs that way that more than offset the extra time spent writing types and being a little bit more verbose to keep flow happy.
The minor annoyances are around the edge cases. Like eslint/flow throws propType errors when using props that were dereferenced from `this.props.someObject`. But you can just write the longer version `this.props.someObject.whatever` and everything's fine.
class MyComponent extends React.Component {
state: Object;
constructor(props) {
super(props);
this.state = {
foo: 1, // no type error
};
};
}