Context clonning error when creating custom reporter

[vovsemenv]

Describe the bug

I trying to create custom reporter.
I copy reporter template from basic JSON reporter. https://github.com/vitest-dev/vitest/blob/main/packages/vitest/src/node/reporters/json.ts

When i start tests with this simtle reporter i get error

(node:38) UnhandledPromiseRejectionWarning: TypeError: configureServer(_server) {
            server = _server;
        } could not be cloned.

in all DefaultReporter reporters this works just fine, but cause error in custom ones

onInit(ctx) {
   this.ctx = ctx;
}

My code

import { Reporter } from 'vitest';
import { Vitest } from 'vitest/node';

export class TestReporter implements Reporter {
  ctx!: Vitest;

  onInit(ctx) {
    this.ctx = ctx;
  }

  onFinished(files = this.ctx.state.getFiles()) {
    console.log(files);
  }
}

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-nej1kt?file=test-reporter.ts

System Info

System:
    OS: macOS 11.6.1
    CPU: (8) arm64 Apple M1
    Memory: 180.38 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.0 - ~/.nvm/versions/node/v16.13.0/bin/node
    Yarn: 1.22.17 - ~/.nvm/versions/node/v16.13.0/bin/yarn
    npm: 8.1.0 - ~/.nvm/versions/node/v16.13.0/bin/npm
  Browsers:
    Chrome: 97.0.4692.71
    Firefox: 96.0.2
    Safari: 15.2
  npmPackages:
    @vitejs/plugin-vue: ^2.0.1 => 2.1.0 
    @vitejs/plugin-vue-jsx: ^1.3.3 => 1.3.3 
    vite: ^2.7.13 => 2.7.13 
    vitest: ^0.2.0 => 0.2.0

### 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.