开发时倒是好好的，但是再次 clone 到不同目录，或者其他电脑上 clone 之后，先 tyarn 安装依赖，然后 tyarn start 报错：
> tyarn start
yarn run v1.22.10
$ cross-env UMI_ENV=dev umi dev
Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Why you should do it regularly:
https://github.com/browserslist/browserslist#browsers-data-updating
Bundle with webpack 5...
Starting the development server...
Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
- configuration[0] has an unknown property 'experiments'. These properties are valid:
object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry?, externals?, infrastructureLogging?, loader?, mode?, module?, name?, node?, optimization?, output?, parallelism?, performance?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, serve?, stats?, target?, watch?, watchOptions? }
WebpackOptionsValidationError: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
- configuration[0] has an unknown property 'experiments'. These properties are valid:
object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry?, externals?, infrastructureLogging?, loader?, mode?, module?, name?, node?, optimization?, output?, parallelism?, performance?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, serve?, stats?, target?, watch?, watchOptions? }
at Object.webpack (/xxx/node_modules/@umijs/deps/compiled/webpack/4/bundle4.js:138983:9)
at Bundler.setupDevServerOpts (/xxx/node_modules/@umijs/bundler-webpack/lib/index.js:197:40)
at /xxx/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/commands/dev/dev.js:300:30
at Generator.next (<anonymous>)
at asyncGeneratorStep (/xxx/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/commands/dev/dev.js:74:103)
at _next (/xxx/node_modules/umi/node_modules/@umijs/preset-built-in/lib/plugins/commands/dev/dev.js:76:194)
Done in 7.44s.
这个报错信息简直了，相当于没有。。。
在 Antd Pro Github Issue 中找到一个同样的问题讨论，并给出解决方法：
https://github.com/ant-design/ant-design-pro/issues/8767
是的，我发现报错原因是：config/config.dev.ts中有一个webpack5的空配置项 {}，需要将该属性设置为false。
修复方法
修改 config/config.dev.ts
//webpack5: {
// // lazyCompilation: {},
//},
webpack5: false,
好了，终于可以正常启动了。
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