import Button from 'element-ui/lib/Button.js'
import Button from 'element-ui/lib/theme-chalk/Button.css'

Vue.use(Button);

import { Button } from 'components'

// 转换为

var button = require('components/lib/button')
require('components/lib/button/style.css')

import Button from './src/main';

Button.install = function(Vue) {
 Vue.component(Button.name, Button);
};

export default Button;

<template>
 <div>
 我是一个Button组件
 </div>
</template>

import Button from './Button';
import Loading from './Loading';
import LoadMore from './LoadMore';

const components = [
 Button,
 LoadMore,
 Loading
];

const install = function(Vue) {
 components.forEach(component => {
 Vue.component(component.name, component);
 });
}

if (typeof window !== 'undefined' && window.Vue) {
 install(window.Vue)
}

export default {
 install, // 全量引入
 Button,
 LoadMore,
 Loading
};

const entrys = {
 Button: path.resolve(__dirname, '../packages/Button'),
 index: path.resolve(__dirname, '../packages')
};

const webpackConfig = merge(baseWebpackConfig, {
 entry: entrys,
 // ......
});

const entrys = require(./getComponents.js)([组件目录入口]);
const webpackConfig = merge(baseWebpackConfig, {
 entry: entrys,
 ......
});

const fs = require('fs');
const path = require('path');

/**
 * 判断刚路径是否含有index.js
 * @param {String} dir 
 */
function hasIndexJs(dir) {
 let dirs = [];
 try {
  dirs = fs.readdirSync(dir);
 } catch(e) {
  dirs = null;
 }
 return dirs && dirs.includes('index.js');
}

/**
 * 获取指定入口和入口下包含index.js的文件夹的路径
 * @param {String} entryDir 
 */
const getPath = function(entryDir) {
 let dirs = fs.readdirSync(entryDir);
 
 const result = {
  index: entryDir
 };
 dirs = dirs.filter(dir => {
  return hasIndexJs(path.resolve(entryDir, dir));
 }).forEach(dir => {
  result[dir] = path.resolve(entryDir, dir); 
 });
 return result;
}

module.exports = getPath;

output: {
 path: config.build.assetsRoot,
 filename: utils.assetsPath('[name].js'),
 library: 'LoadOnDemand',
 libraryTarget: 'umd'
},

"plugins": [
 [
  "component",
  {
  "libraryName": "load-on-demand", // 组件库的名字
  "camel2Dash": false, // 是否把驼峰转换成xx-xx的写法
  "styleLibrary": {
   "base": false, // 是否每个组件都默认引用base.css
   "name": "theme" // css目录的名字
  }
  }
 ]
 ],