umi常见问题 https://umijs.org/zh-CN/docs/faq
https://www.it610.com/search/umi/1.htm

  1. 删掉 /src下的 .umi文件夹，相当于清除了缓存，重启项目；

初始化项目，无法登陆

不要npm run dev
一定要 npm start 启动项目
npm start
npm start
npm start
image.png

npm run xxx，只有 start 和 test 不需要 run

npm start:no-proxy，报错，正确的是 npm run start:no-socket
https://github.com/ant-design/ant-design-pro/issues/1181

umi4x常见问题

Invalid config keys: dynamicImport

fatal - AssertionError [ERR_ASSERTION]: Invalid config keys: dynamicImport
at Function.validateConfig (/antdPro6/node_modules/umi/node_modules/@umijs/core/dist/config/config.js:179:31)
debug文档
https://github.com/umijs/umi/issues/8043
https://www.w3h5.com/post/710.html
解决：更新 preset-react插件

  1. {
  2.   "dependencies": {
  3. -    "@umijs/preset-react": "^1.8.17",
  4. +    "@umijs/preset-react": "^2.1.0",
  5.   }
  6. }

umi3x 常见问题

missingPlugin: [ ‘optionalChaining’ ]可选链

  1. 判断一个较深层次的对象属性是否存在 cell?.pageIndex
  2. 可选链Optional Chaining的用法 https://www.jianshu.com/p/a46f38b84df2
  3. 主要是为了解决繁琐的深层次嵌套问题，属性和方法均可用 ```javascript const { getValue } = this.props

getValue && getValue() getValue?.()

const arr=[1,2,3] arr?.map(item=>{ //… })

  3. <a name="cFKuU"></a>
  4. ## eslint报错
  5. _Error: Could not find "stylelint-config-standard". Do you need a `configBasedir`?_
  7. _Error: Failed to load plugin 'react' declared in '.eslintrc.js » /Users/lulongwen/Documents/Project/CRM/MEMBER-UMI3/node_modules/@umijs/fabric/dist/eslint.js': Cannot find module 'eslint-plugin-react'_<br />![image.png](https://cdn.nlark.com/yuque/0/2021/png/112859/1635776307303-610d144b-0413-427c-923b-d5a554150d06.png#averageHue=%238da2bf&clientId=u677977d9-1b92-4&errorMessage=unknown%20error&from=paste&height=163&id=nhNWy&originHeight=326&originWidth=1142&originalType=binary&ratio=1&rotation=0&showTitle=false&size=62991&status=error&style=none&taskId=ud5d9238f-09bb-444b-9ae8-7488269d6bb&title=&width=571)<br />_Error: Failed to load plugin 'jest' declared in '.eslintrc.js » /Users/lulongwen/Documents/Project/CRM/MEMBER-UMI3/node_modules/@umijs/fabric/dist/eslint.js': Cannot find module 'eslint-plugin-jest'_
  9. _Error: Failed to load plugin 'unicorn' declared in '.eslintrc.js » /Users/lulongwen/Documents/Project/CRM/MEMBER-UMI3/node_modules/@umijs/fabric/dist/eslint.js': Cannot find module 'eslint-plugin-unicorn'_
  10. ```bash
  11. yarn add stylelint-config-standard --dev
  12. yarn add eslint-plugin-react --dev
  13. yarn add eslint-plugin-jest --dev
  15. yarn add eslint-plugin-unicorn --dev
  16. yarn add eslint-plugin-react-hooks --dev

Parsing error: The keyword ‘import’ is reserved

没有在配置文件.eslintrc中配置parserOptions来指定语言版本为和模块类型
eslintrc.js

  1. parserOptions: {
  2.   "ecmaVersion": 7,
  3.   "sourceType": "module"
  4. },

ignore-scripts

Make sure you don’t have “ignore-scripts” set to true. You can check this with
“npm config get ignore-scripts”. If that returns true you can reset it back to
false using “npm config set ignore-scripts false” and then reinstall esbuild.

lockfileVersion

If you’re using npm v7, make sure your package-lock.json file contains either
“lockfileVersion”: 1 or the code “hasInstallScript”: true. If it doesn’t have
either of those, then it is likely the case that a known bug in npm v7 has
corrupted your package-lock.json file. Regenerating your package-lock.json file
should fix this issue.

Browserslist

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…

  1. npx browserslist@latest --update-db

image.png

socket-server

https://blog.csdn.net/violetjack0808/article/details/86577776