/*  ==== ECMAScript 6 variant ====  */

export default (base, ...mixins) => {

  /*  create aggregation class  */
  const merge = class __Merge extends base {
    constructor (...args) {
      /*  call base class constructor  */
      super(...args)

      /*  call mixin's initializer  */
      mixins.forEach((mixin) => {
        if (typeof mixin.prototype.initializer === 'function')
          mixin.prototype.initializer.apply(this, args)
      })
    }
  }

  /*  copy properties  */
  let copyProps = (target, source) => {
    Object.getOwnPropertyNames(source)
      .concat(Object.getOwnPropertySymbols(source))
      .forEach((prop) => {
        if (typeof prop.match ==='function') {
          if (prop.match(/^(?:initializer|constructor|prototype|arguments|caller|name|bind|call|apply|toString|length)$/))
            return
        }
        Object.defineProperty(target, prop, Object.getOwnPropertyDescriptor(source, prop))
      })
  }

  /*  copy all properties of all mixins into aggregation class  */
  mixins.forEach((mixin) => {
    copyProps(merge.prototype, mixin.prototype)
    copyProps(merge, mixin)
  })

  return merge
}