Function clone

lib/prefixer.js:8–34

* Recursively clone objects

(obj, parent)

 * Recursively clone objects
 */
function clone(obj, parent) {
  let cloned = new obj.constructor()

  for (let i of Object.keys(obj || {})) {
    let value = obj[i]
    if (i === 'parent' && typeof value === 'object') {
      if (parent) {
        cloned[i] = parent
      }
    } else if (i === 'source' || i === null) {
      cloned[i] = value
    } else if (Array.isArray(value)) {
      cloned[i] = value.map(x => clone(x, cloned))
    } else if (
      i !== '_autoprefixerPrefix' &&
      i !== '_autoprefixerValues' &&
      i !== 'proxyCache'
    ) {
      if (typeof value === 'object' && value !== null) {
        value = clone(value, cloned)
      }
      cloned[i] = value
    }
  }

  return cloned
}

class Prefixer {
  constructor(name, prefixes, all) {