Flow import type counted as "defined but never used"

[wincent]

import type Foo from 'foo';

function log(foo: Foo) {
  console.log(foo);
}

Complains that Foo is "defined but never used" (no-unused-vars).

PR #89 was previously submitted but withdrawn to address this, but the problem's still there. Filing this issue to make sure we don't lose track of it.

[hzoo]

Ok thanks!. So I think I know how to fix this - do the same escope patching as for decorators.

---

However there's some more places where flow types are used that could result in the same error right? We probably want to cover all of those as well?

function log(foo): Foo { return 1; } // return
var foo: Foo = 1; // var decl

I'l probably need to use the tests in https://github.com/babel/babel/blob/088846a3479375a51d71084cb4fd70ef8fa21d29/test/acorn/tests-flow.js then? Looks like a lot of places!

[hzoo]

@wincent I think #109 should fix a lot of the flow type unused issues? There's a lot missing but it probably covers most use cases.

[wincent]

Thanks @hzoo!

[FDiskas]

Still got this error 💊

import type { TDemo } from '../typings/demo';

├─ [email protected]
└─ [email protected]
   └─ [email protected]

[smikheiev]

I also had the same problem with version 8.2.1:
import type { $Application, $Request, $Response } from 'express'
The only thing that helped was rollback to version 7.2.1.

[shengt]

Same issue here. 8.0.3 is fine

import type {Request, Response} from '../types'

[1215904405a]

flow react warning type 'Props' is defined but never used no-unused-vars how handle?