validateCall(args, flags) {
    if (!args.package && flags.testFilter) {
      throw new Error(
        "No package name given. To use -t please specify a package or use core."
      );
    }
    if (flags.watch && flags.watchAll) {
      throw new Error(
        "Ether use 'watch' or 'watchAll' but not both at the same time."
      );
    }
  }
Validate CLI Call
@param {object} args
@param {object} flags
@throws {Error}
@returns {void}