webpack.config.js

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

module.exports = (env = {}) => {
  const target = env.target || 'Wechat';
	const isWechat = target !== 'Alipay';
	const isAlipay = !isWechat;

  return {
    mode: 'production',
    entry: './src/index.js',
    output: {
      path: path.resolve(__dirname, 'lib'),
      filename: `weapp.socket.io.${isWechat ? 'wx' : 'my'}.js`,
      libraryTarget: 'umd',
    },
    plugins: [
      new webpack.DefinePlugin({
        wx: isWechat ? 'wx' : 'my',
				my: isAlipay ? 'my' : 'wx',
      }),
      new webpack.NormalModuleReplacementPlugin(/debug/, process.cwd() + '/support/noop.js'),
      new webpack.NormalModuleReplacementPlugin(/^ws$/g, process.cwd() + '/src/wx-ws.js'),
      new webpack.NormalModuleReplacementPlugin(/^.\/websocket-constructor$/g, process.cwd() + '/src/websocket-constructor.js'),
      new webpack.NormalModuleReplacementPlugin(/^.\/transports\/index$/g, process.cwd() + '/src/transport.js'),
      new webpack.NormalModuleReplacementPlugin(/^.\/util$/g, process.cwd() + '/src/util.js'),
      new webpack.NormalModuleReplacementPlugin(/^.\/engine.io-client\/lib\/util$/g, process.cwd() + '/src/util.js'),
    ],
    module: {
      rules: [{
        test: /engine.io-client\/lib\/socket.js$/,
        loader: 'string-replace-loader',
        options: {
          multiple: [{
            search: '["polling", "websocket"]',
            replace: '["websocket"]',
          }, {
            search: "['polling', 'websocket']",
            replace: "['websocket']",
          }]
        }
      }, {
        test: /engine.io-client\/lib\/transports\/websocket.js$/,
        loader: 'string-replace-loader',
        options: {
          multiple: [{
            search: "typeof window === 'undefined'",
            replace: "typeof window === 'undefined' || typeof window !== 'undefined'",
          }]
        }
      }]
    }
  }
};