Regression: Typescript error with "to.be.a"

[xsrvmy]

Describe the bug

A typescript error occurs when using expect(...).to.be.a(...).

This seems to be a regression: there is no typescript error on the version used by the demo stackblitz (0.0.136).

Reproduction

https://stackblitz.com/edit/node-spzkwl?file=test%2Fbasic.test.ts&view=editor

Note the typescript error on line 20.

System Info

System:
    OS: Linux 5.16 Arch Linux
    CPU: (16) x64 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz
    Memory: 18.32 GB / 31.08 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 16.13.2 - ~/.volta/tools/image/node/16.13.2/bin/node
    Yarn: 1.22.17 - ~/.volta/tools/image/yarn/1.22.17/bin/yarn
    npm: 8.4.1 - ~/.volta/tools/image/npm/8.4.1/bin/npm
  Browsers:
    Firefox: 96.0.3
  npmPackages:
    @vitejs/plugin-react: ^1.0.7 => 1.1.4 
    vite: ^2.7.2 => 2.7.13 
    vitest: ^0.2.8 => 0.2.8 

### Used Package Manager

npm

### Validations

- [X] Follow our [Code of Conduct](https://github.com/vitest-dev/vitest/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guidelines](https://github.com/vitest-dev/vitest/blob/main/CONTRIBUTING.md).
- [X] Read the [docs](https://vitest.dev/guide).
- [X] Check that there isn't [already an issue](https://github.com/vitest-dev/vitest/issues) that reports the same bug to avoid creating a duplicate.
- [X] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/vitest-dev/vitest/discussions) or join our [Discord Chat Server](https://chat.vitest.dev).
- [X] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.

[stygian-desolator]

It looks like a problem with @types/chai, the type of a is not correct.

[sheremet-va]

It looks like a problem with @types/chai, the type of a is not correct.

This is interesting. Typeof a is callable, but most of the other chainables are not, which begs the questing of how do we support it? Right now I just replicated the Chai.Assertion type with this bug.

[xsrvmy]

Interestingly if I import expect from chai then there isn't a problem.
I just used ts-ignore for now.