babel/experimental/babel-preset-env/test/debug-fixtures/plugins-only/options.json

{
  "presets": [
    ["../../lib", {
      "debug": true,
      "exclude": [
        "transform-async-to-generator",
        "transform-regenerator", "transform-es2015-parameters"
      ],
      "targets": {
        "firefox": 52,
        "node": 7.4
      }
    }]
  ]
}