babel/packages/babel-preset-env/test/debug-fixtures/specific-targets/options.json

{
  "presets": [
    ["../../lib", {
      "debug": true,
      "targets": {
        "browsers": "ie 10, ios 9, safari 7, edge 13, chrome 54, firefox 49"
      },
      "useBuiltIns": "entry"
    }]
  ]
}