maputnik/.babelrc

{
  "presets": ["@babel/preset-env", "@babel/preset-react"],
  "plugins": [
    "react-hot-loader/babel",
    "@babel/plugin-proposal-class-properties",
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
  ],
  "env": {
    "test": {
      "plugins": [
        ["istanbul", {
          "exclude": ["node_modules/**", "test/**"]
        }]
      ]
    }
  }
}