{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": [
          "last 3 major versions",
          "Firefox ESR",
          "Chrome >= 53",
          "not dead",
          "not ie 11",
          "not baidu 7",
          "not and_qq 11",
          "not and_uc 12",
          "not op_mini all"
        ],
        "bugfixes": true,
        "loose": true
      }
    ]
  ]
}