Cannot add purgecss with vue-cli

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Cannot add purgecss with vue-cli. I get the following error on vue add purgecss:

npm ERR! code E404
npm ERR! 404 Not Found - GET https://registry.npmjs.com/vue-cli-plugin-purgecss - Not found
npm ERR! 404
npm ERR! 404  'vue-cli-plugin-purgecss@latest' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\papil\AppData\Roaming\npm-cache\_logs\2020-03-30T15_10_50_910Z-debug.log
 ERROR  command failed: npm install --loglevel error vue-cli-plugin-purgecss -D --registry=https://registry.npm.taobao.org

[papiliond]

@Ffloriel After adding it with vue-cli 4.1.2 and running vue-cli-service serve --mode development, i get the following error (also on build):

internal/modules/cjs/loader.js:638
    throw err;
    ^

Error: Cannot find module '@fullhuman/vue-cli-plugin-purgecss'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:690:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at idToPlugin (C:\Users\papil\source\repos\sport-vue\node_modules\@vue\cli-service\lib\Service.js:149:14)
    at Object.keys.concat.filter.map.id (C:\Users\papil\source\repos\sport-vue\node_modules\@vue\cli-service\lib\Service.js:188:20)
    at Array.map (<anonymous>)
    at Service.resolvePlugins (C:\Users\papil\source\repos\sport-vue\node_modules\@vue\cli-service\lib\Service.js:174:10)
    at new Service (C:\Users\papil\source\repos\sport-vue\node_modules\@vue\cli-service\lib\Service.js:33:25)
    at Object.<anonymous> (C:\Users\papil\source\repos\sport-vue\node_modules\@vue\cli-service\bin\vue-cli-service.js:15:17)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sport-vue@0.1.0 serve: `vue-cli-service serve --mode development`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sport-vue@0.1.0 serve script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\papil\AppData\Roaming\npm-cache\_logs\2020-03-31T09_13_15_449Z-debug.log

I don’t understand the reason, becouse I have the @fullhuman/vue-cli-plugin-purgecss package in my node-modules directory.

Thank you!

[Ffloriel]

The documentation is incorrect. It’s vue add @fullhuman/purgecss I’ll update the docs