求教：config里面的window 如何按照多端判断

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import Taro, { Component, Config } from '@tarojs/taro'
import './app.scss'
import './constant/global'

var new_window = {};
if (process.env.TARO_ENV === 'alipay') {
  new_window = {
    "transparentTitle": "none" ,
    "titlePenetrate":"NO", 
  }
  console.log(new_window);
}
if (process.env.TARO_ENV === 'weapp') {
  console.log(1111);
  new_window.navigationStyle = 'custom';
  console.log(new_window);
  
}

class App extends Component {
  config: Config = {
    pages: [
      'pages/home/index',
      'pages/business/index',
      'pages/service/index',
      'pages/user/index',
    ],
    window: new_window,
    tabBar: {
      "custom": true,
      "color": "#999999",
      "selectedColor": "#222222",
      "borderStyle": "white",
      "list": [{
        "selectedIconPath": "static/images/a1h.png",
        "iconPath": "static/images/a1.png",
        "pagePath": "pages/home/index",
        "text": "首页"
      }, {
        "selectedIconPath": "static/images/a2h.png",
        "iconPath": "static/images/a2.png",
        "pagePath": "pages/business/index",
        "text": "业务"
      }, {
        "selectedIconPath": "static/images/a3h.png",
        "iconPath": "static/images/a3.png",
        "pagePath": "pages/service/index",
        "text": "服务"
      }, {
        "selectedIconPath": "static/images/a4h.png",
        "iconPath": "static/images/a4.png",
        "pagePath": "pages/user/index",
        "text": "我的"
      }]
    },
    "permission": {
      "scope.userLocation": {
        "desc": "你的位置信息将用于附近商家的展示"
      }
    }
  }


  componentWillMount() {
    //this.configInit();
    //这里隐藏支付宝的顶部tabBar
    if (process.env.TARO_ENV === 'alipay') {
      Taro.hideTabBar({
        animation: false
      })
    }
  }

  componentDidShow() { }

  componentDidHide() { }

  componentDidCatchError() { }

  // this.props.children 是将要会渲染的页面
  render() {
    return this.props.children
  }
}

export default App

config里面的window 如何按照多端判断，我这样写是无效的