node + koa2：打包、阿里云上线启动

koa2 打包即webpack.config.js的配置：

const path = require('path');
const argv = require('node-argv');
const webpack = require('webpack');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const nodeExternals = require('webpack-node-externals');
const MinifyPlugin = require('babel-minify-webpack-plugin');

const { options } = argv(process.argv, {});
const ENV = options.env || process.env.npm_config_env;

module.exports = {
  mode: 'production',
  entry: path.resolve(__dirname, './bin/www'), // 入口文件
  output: {
    path: path.resolve(__dirname, './dist'), // 输出路径
    filename: 'app.js' // 输出项目根目录
  },
  module: {
    rules: [{
      test: /\.js$/,
      exclude: /node_modules/,
      loader: 'babel-loader'
    }]
  },
  target: 'node', // 服务端打包
  externals: [nodeExternals()], //node 打包可去除一些警告
  node: {
    console: true,