@emotion/babel-preset-css-prop/src/index.js

import jsx from '@babel/plugin-transform-react-jsx'
import pragmatic from '@emotion/babel-plugin-jsx-pragmatic'
import emotion from '@emotion/babel-plugin'

let pragmaName = '___EmotionJSX'

// pull out the emotion options and pass everything else to the jsx transformer
// this means if @babel/plugin-transform-react-jsx adds more options, it'll just work
// and if @emotion/babel-plugin adds more options we can add them since this lives in
// the same repo as @emotion/babel-plugin

export default (
  api,
  { pragma, sourceMap, autoLabel, labelFormat, importMap, ...options } = {}
) => {
  if (options.runtime) {
    throw new Error(
      'The `runtime` option has been removed. If you want to configure `runtime: "automatic"`, replace `@emotion/babel-preset-css-prop` with `@babel/preset-react` and `@emotion/babel-plugin`. You can find out how to configure things properly here: https://emotion.sh/docs/css-prop#babel-preset'
    )
  }

  return {
    plugins: [
      [
        pragmatic,
        {
          export: 'jsx',
          module: '@emotion/react',
          import: pragmaName
        }
      ],
      [
        jsx,
        {
          pragma: pragmaName,
          pragmaFrag: 'React.Fragment',
          ...options
        }
      ],
      [
        emotion,
        {
          sourceMap,
          autoLabel,
          labelFormat,
          cssPropOptimization: true,
          importMap
        }
      ]
    ]
  }
}