{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "browsers": [">0.25%", "not ie 11", "not op_mini all"]
        },
        "exclude": [
          "@babel/plugin-transform-async-to-generator",
          "@babel/plugin-transform-arrow-functions"
        ],
        "corejs": { "version": "3.8", "proposals": true },
        "useBuiltIns": "usage"
      }
    ]
  ],
  "plugins": [
    "@babel/plugin-transform-runtime",
    "@babel/plugin-proposal-class-properties"
  ],
  "env": {
    "test": {
      "plugins": ["istanbul"]
    }
  }
}