daspo-free-zone/.babelrc

{
  "presets": [
    [
      "env",
      {
        "targets": {
          "browsers": "last 2 Firefox versions, last 2 Chrome versions, last 2 Edge versions, last 2 Safari versions"
        },
        "exclude": ["/mapbox-gl"]
      }
    ]
  ],
  "plugins": ["@babel/plugin-proposal-class-properties"]
}