next.js/examples/with-external-scoped-css/.babelrc

{
  "presets": ["next/babel"],
  "plugins": [
    [
      "css-modules-transform", {
        "extensions": [".css", ".sass"],
        "extractCss": "./static/css/bundle.css",
        "preprocessCss": "./pre-processor.js"
      }
    ]
  ]
}