reproduce a bug in flow (0.83.0 for example)

.flowconfig

# empty

bar.js

// @flow
export class Bar {}

c.js

// @flow
import type { A } from './redux';

export type B = string;
export type C = string;

foo.js

// @flow
import { Bar } from './bar';
import type { C } from './c';

export class Foo {
    constructor(bar: Bar) {}
}

foobar.js

// @flow
import { Bar } from './bar';
import { Foo } from './foo';

export const bar = new Bar();
export const foo = new Foo(bar);

redux.js

// @flow
import type { B } from './c';
import type { Foo } from './foo';

export type Action = { type: 'ACTION1' } | { type: 'ACTION2', foo: Foo };
export type A = string;

const reducer = (action: Action): number => action.type === 'ACTION1' ? 1 : 2;