code: function getExe() {
    /* istanbul ignore next: tested on all platform on travis */
    switch (process.platform) {
      case "darwin":
        return "mkcert-" + MKCERT_VERSION + "-darwin-amd64"
      case "linux":
        return "mkcert-" + MKCERT_VERSION + "-linux-amd64"
      case "win32":
        return "mkcert-" + MKCERT_VERSION + "-windows-amd64.exe"
      default:
        console.warn("Cannot generate the localhost certificate on your " +
          "platform. Please, consider contacting the developer if you can help.")
        process.exit(0)
    }
  }
docs: get the executable name