if (status === 200) {

  const _responseText = response.data;

  let result200: any = null;
  let resultData200  = _responseText;

  if (resultData200 && resultData200.constructor === Array) {

    result200 = [] as any;

    for (let item of resultData200)
      result200!.push(item);
  }

  return result200;
}

module.exports = {
  presets: [[ '@vue/app', { useBuiltIns: false } ]]
  plugins: [
    '@babel/plugin-syntax-dynamic-import'
  ]
}

var arr = [ 'a', 'b' ];
  console.log(`Check this: ${arr.constructor === Array}`);