运行npm run clean出错：

internal/modules/cjs/loader.js:596    throw err;    ^Error: Cannot find module '../lib/utils/unsupported.js'    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:594:15)    at Function.Module._load (internal/modules/cjs/loader.js:520:25)    at Module.require (internal/modules/cjs/loader.js:650:17)    at require (internal/modules/cjs/helpers.js:20:18)    at /usr/local/lib/node_modules/npm/bin/npm-cli.js:19:21    at Object.
     
       (/usr/local/lib/node_modules/npm/bin/npm-cli.js:153:3)    at Module._compile (internal/modules/cjs/loader.js:702:30)    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)    at Module.load (internal/modules/cjs/loader.js:612:32)    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
     

解决办法：

sudo rm -rf /usr/local/lib/node_modules/npm

先把之前的文件删除

userdeMBP:~ user$ brew uninstall --force nodeError: Refusing to uninstall /usr/local/Cellar/node/11.1.0because it is required by yarn, which is currently installed.You can override this and force removal with:  brew uninstall --ignore-dependencies node

然后再删除node，因为我有安装yarn，所以使用--ignore-dependencies：

userdeMBP:~ user$ brew uninstall --ignore-dependencies nodeUninstalling /usr/local/Cellar/node/11.1.0... (3,936 files, 47.0MB)node 9.10.1 is still installed.Remove all versions with `brew uninstall --force node

然后再安装：

userdeMacBook-Pro:~ user$ brew install node==> Downloading https://homebrew.bintray.com/bottles/node-11.1.0.mojave.bottle.tAlready downloaded: /Users/user/Library/Caches/Homebrew/downloads/2d71518883b6f6ce458778abea35981525ecdee4a14408431b9f42ed132015e1--node-11.1.0.mojave.bottle.tar.gz==> Pouring node-11.1.0.mojave.bottle.tar.gz==> CaveatsBash completion has been installed to:  /usr/local/etc/bash_completion.d==> Summary?  /usr/local/Cellar/node/11.1.0: 3,936 files, 47.0MB

然后就成功了：

userdeMacBook-Pro:~ user$ npmUsage: npm where  is one of:...