const loaderUtils = require('loader-utils')

module.exports = function (source) {
  const matchPXExp = /([0-9.]+px)/g
  const retina = loaderUtils.getOptions(this)?.retina

  if (!retina) {
    return source
  }

  return source.replace(matchPXExp, (_match, m1) => {
    const pixels = Number(m1.slice(0, m1.length - 2))
    return pixels * 2 + 'px'
  })
}