.babelrc

{
  "presets": [
    ["@babel/preset-env", {
      "modules": false,
      "targets": "> 0.25%, not dead"
    }],
    "@babel/preset-react",
    "next/babel",
    "@babel/preset-flow"
  ],
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-object-rest-spread",
    "@babel/plugin-transform-regenerator",
    "@babel/plugin-transform-async-to-generator",
    "@babel/plugin-syntax-dynamic-import"
  ],
  "env": {
    "test": {
      "presets": [
        "@babel/preset-env",
        "@babel/preset-react",
        "next/babel",
        "@babel/preset-flow"
      ],
      "plugins": [
        "@babel/plugin-transform-modules-commonjs",
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-object-rest-spread",
        "@babel/plugin-transform-regenerator",
        "@babel/plugin-transform-async-to-generator",
        "@babel/plugin-syntax-dynamic-import"
      ]
    },
    "production": {
      "plugins": ["transform-remove-console"],
      "comments": false
    }
  }
}