看一下正常的安装报错：
➜ antdv3 git:(master) ✗ npm install less less-loader --save
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! Found: webpack@4.46.0
npm ERR! node_modules/webpack
npm ERR! peer webpack@"^4.0.0" from @intervolga/optimize-cssnano-plugin@1.0.6
npm ERR! node_modules/@intervolga/optimize-cssnano-plugin
npm ERR! @intervolga/optimize-cssnano-plugin@"^1.0.5" from @vue/cli-service@4.5.15
npm ERR! node_modules/@vue/cli-service
npm ERR! peer @vue/cli-service@"^3.0.0 || ^4.0.0-0" from @vue/cli-plugin-babel@4.5.15
npm ERR! node_modules/@vue/cli-plugin-babel
npm ERR! dev @vue/cli-plugin-babel@"~4.5.0" from the root project
npm ERR! 5 more (@vue/cli-plugin-eslint, @vue/cli-plugin-pwa, ...)
npm ERR! peer webpack@"^4.0.0 || ^5.0.0" from @soda/friendly-errors-webpack-plugin@1.8.1
npm ERR! node_modules/@soda/friendly-errors-webpack-plugin
npm ERR! @soda/friendly-errors-webpack-plugin@"^1.7.1" from @vue/cli-service@4.5.15
npm ERR! node_modules/@vue/cli-service
npm ERR! peer @vue/cli-service@"^3.0.0 || ^4.0.0-0" from @vue/cli-plugin-babel@4.5.15
npm ERR! node_modules/@vue/cli-plugin-babel
npm ERR! dev @vue/cli-plugin-babel@"~4.5.0" from the root project
npm ERR! 5 more (@vue/cli-plugin-eslint, @vue/cli-plugin-pwa, ...)
npm ERR! 21 more (@vue/cli-plugin-babel, @vue/cli-plugin-eslint, ...)
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! less-loader@"*" from the root project
npm ERR!
npm ERR! Conflicting peer dependency: webpack@5.65.0
npm ERR! node_modules/webpack
npm ERR! peer webpack@"^5.0.0" from less-loader@10.2.0
npm ERR! node_modules/less-loader
npm ERR! less-loader@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See /Users/yoyo/.npm/eresolve-report.txt for a full report.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/yoyo/.npm/_logs/2022-01-05T00_39_51_254Z-debug.log
解决方案：
- ## 安装到dev环境，在devDependencies下面，正式环境并不需要
- npm i less --save-dev
先把less安装最新版本，然后指定版本安装less-loader：
- npm i less-loader@7 -D
yarn命令：
- ## 安装
- yarn add less -D
- ## 卸载
- yarn remove less
