rsnext/examples/with-jest/.babelrc

{
  "env": {
    "development": {
      "presets": ["next/babel"]
    },
    "production": {
      "presets": ["next/babel"]
    },
    "test": {
      // next/babel does not transpile import/export syntax.
      // So, using es2015 in the beginning will fix that.
      "presets": ["es2015", "next/babel"]
    }
  }
}