全局环境webpack4.2.0的降级

日常学习工作，npm、cnpm、yarn 混着用，也不清楚全局安装webpack的时候用的什么工具了，现在想将为webpack降级。

如何卸载webpack4.2.0

尝试了
npm uninstall webpack
cnpm uninstall webpack

查询webpack的目录
which webpack
/Users/gaobingyan/.nvm/versions/node/v10.13.0/bin/webpack

查询webpack的软目录
ls -l which webpack
lrwxr-xr-x 1 gaobingyan staff 42 7 2 19:01 /Users/gaobingyan/.nvm/versions/node/v10.13.0/bin/webpack -> ../lib/node_modules/webpack/bin/webpack.js

yarn的正确卸载

yarn global remove webpack

从新安装 npm I -g [email protected]
webpack -v