Method onClose

packages/vitest/src/node/core.ts:1612–1614

* Register a handler that will be called when the server is closed.

(fn: () => Awaitable<void>)

   * Register a handler that will be called when the server is closed.
   */
  onClose(fn: () => Awaitable<void>): void {
    this._onClose.push(fn)
  }

  /**
   * Register a handler that will be called when the tests are rerunning.