Configuração do babel

config.json

"browserslist": {
  "production": [
    ">0.2%",
    "not dead",
    "not op_mini all"
  ],
  "development": [
    "last 1 chrome version",
    "last 1 firefox version",
    "last 1 safari version"
  ]
},

"babel": {
  "presets": [
    [
      "react-app",
      {
        "absoluteRuntime": false
      }
    ]
  ]
}