react-native-firebase/bridge/.babelrc

{
  "presets": [
    "react-native"
  ],
  "env": {
    "development": {
      "plugins": [
        ["istanbul", {
          "useInlineSourceMaps": true,
          "instrument": true,
          "include": [
            "firebase"
          ]
        }]
      ]
    }
  }
}