How to use the react-native-vector-icons/lib/create-icon-set function in react-native-vector-icons

import createIconSet from 'react-native-vector-icons/lib/create-icon-set';
import glyphMap from './iconfont.json';

// glyphMap, fontFamily, fontFile三个参数，注意看react-native-vector-icons官方文档中方法注释，
// Android中fontFamily可以随便写，iOS必须是正确的名字否则运行报错，iOS可以直接双击iconfont.ttf打开看字体实际叫什么名字
const iconSet = createIconSet(glyphMap, 'iconFont', 'iconfont.ttf');

export default iconSet;

export const Button = iconSet.Button;
export const TabBarItem = iconSet.TabBarItem;
export const TabBarItemIOS = iconSet.TabBarItemIOS;
export const ToolbarAndroid = iconSet.ToolbarAndroid;
export const getImageSource = iconSet.getImageSource;

/**
 * Created by Rabbit on 2018/4/13.
 */

import createIconSet from 'react-native-vector-icons/lib/create-icon-set';
import glyphMap from './iconfont';

const CustomIcon = createIconSet(glyphMap, 'iconfont', 'iconfont.ttf');

export default CustomIcon;

*/
'use strict';

import createIconSet from 'react-native-vector-icons/lib/create-icon-set';
import {
  GLYPH_MAP,
  FONT_NAME,
  FONT_FILE
} from './config'

/**
 * Icon Component
 * @example
 * 
 */
export default class Icon extends createIconSet(GLYPH_MAP, FONT_NAME, FONT_FILE) {
  /**
   * @param {object} prop
   * @param {string} prop.name - Icon name
   * @param {number} [prop.size=12] - Icon size
   * @param {string} [prop.color] - Icon color
   */
  constructor(props) {
    super(props);
  }
}