Flow issue: Referencing this class as exported

ClassA

// @flow

import ClassB from "./ClassB";

export default class ClassA {

    constructor(objB : ClassB) {
    }
    
}

ClassB

// @flow

import ClassA from "./ClassA";

export default class ClassB {

    func(objB : ClassB) : void {
        let classA = new ClassA(objB); // Flow: Cannot call `ClassA` with `objB` bound to `objB` because `ClassB` [1] is incompatible with `ClassB` [2].
    }

}