3.2.17 SSR ReferenceError: LoadingComponent is not defined

[big-camel]

umijs 3.2.17
@umijs/preset-react 1.6.3

开启SSR，生成 dist/umi.server.js 文件后
搜索 server render function
这里 LoadingComponent 好像没有声明

...
/**
     * routes init and patch only once
     * beforeRenderServer must before routes init avoding require error
     */

    if (!routes) {
      // 主要为后面支持按需服务端渲染，单独用 routes 会全编译
      routes = [{
        "path": "/",
        "component": Object(E_projects_react_umi3_2_ssr_test_node_modules_umijs_runtime__WEBPACK_IMPORTED_MODULE_4__["dynamic"])({
          loader: () => Promise.resolve(/*! import() | layouts__BasicLayout */).then(__webpack_require__.bind(null, /*! ./src/layouts/BasicLayout */ "./src/layouts/BasicLayout.js")),
          loading: LoadingComponent
        }),

复现 https://github.com/itellyou-com/umi3.2-ssr-test
服务端 https://github.com/itellyou-com/umi3.2-ssr-test-server
步骤：
在 umi3.2-ssr-test 中 yarn build ，然后将 dist 目录中的文件拷贝到 umi3.2-ssr-test-server ，然后 yarn start ，访问 localhost:3000

ReferenceError: LoadingComponent is not defined
    at q (E:\projects\react\umi3.2-ssr-test-server\dist\umi.server.js:1:1330129)
    at async E:\projects\react\umi3.2-ssr-test-server\src\index.js:28:44
ReferenceError: LoadingComponent is not defined
    at q (E:\projects\react\umi3.2-ssr-test-server\dist\umi.server.js:1:1330129)
    at async E:\projects\react\umi3.2-ssr-test-server\src\index.js:28:44

此时报错，并且 SSR 失效
Originally posted by @itellyou-com in #5263 (comment)

[shlomitsur]

Happened to me too after upgrading to 3.2.17

[big-camel]

@ycjcl868 啥时候能修复好呢，现在做SSR根本无法用啊

[starsoft35]

是呀，这bug很长时间了，啥时候能修复好呢

[big-camel]

是呀，这bug很长时间了，啥时候能修复好呢

要上线的话，只有先 build ，然后再 运行 start，然后再修改 umi.server 文件 加个 var LoadingComponent = null

 if (!routes) {
      // 主要为后面支持按需服务端渲染，单独用 routes 会全编译
var LoadingComponent = null
      routes = [{

然后搜索 const NODE_ENV = "development";改成

const NODE_ENV = "production"