Version

1.0.0-beta.11

Reproduction link

https://github.com/vwxyutarooo/vue-test-utils/blob/dev/types/test/wrapper.ts#L19

Steps to reproduce

Use wrapper.props().checked or wrapper.attributes().foo in TypeScript.

What is expected?

interface BaseWrapper issue.

What is actually happening?

      TS2339: Property 'checked' does not exist on type 'void | { [name: string]: any; }'.
  Property 'checked' does not exist on type 'void'.

void is unnecessary I suppose. This method always returns any type of data including undefined. Is it my misunderstanding or just bug?

Environments for just in case.

- Vue@2.5.13
- @vue/test-utils@1.0.0-beta.11
- jest@22.3.0
- typescript@2.6.2