How to use the free-style.FreeStyle.prototype function in free-style

ReactFreeStyle.prototype.emitChange = function () {
  if (ReactCurrentOwner.current != null) {
    console.warn('Inline styles must be registered before `render`')

    return
  }

  FreeStyle.prototype.emitChange.apply(this, arguments)
}

var ReactCurrentOwner = require('react/lib/ReactCurrentOwner')
var ExecutionEnvironment = require('react/lib/ExecutionEnvironment')

/**
 * Create a React Free Style instance.
 */
function ReactFreeStyle () {
  FreeStyle.call(this)

  this.Element = createElement(this)
}

/**
 * Inherits from `free-style`.
 */
ReactFreeStyle.prototype = Object.create(FreeStyle.prototype)

/**
 * Create a new React Free Style instance.
 *
 * @return {ReactFreeStyle}
 */
ReactFreeStyle.prototype.fresh = function () {
  return new ReactFreeStyle()
}

/**
 * Create a mixin for React.
 *
 * @return {Object}
 */
ReactFreeStyle.prototype.mixin = function () {