Can angular-cli remove unused css?

Question

so far the smallest bundle I can create with angular cli is by running

ng build --aot true -prod

I was wondering if the build process also removes unused css classes e.g. from bootstrap?

If not how can I add libraries like purifycss to it?

EDIT April 2018

I still did not find any satisfying solution to his problem, especially one that is compatible with the lazy loading modules with angular...

Cheers

Answer 1

I did some research recently about this, but I could not find any really safe way of how to remove unused CSS. However I came across some tools which would help you detect dead-code in VS Code. There is an extention which is not perfect but looks promising. Also I did some investigation of how to remove unused Angular Material CSS (if you use it) and created a video about it. You can check this out here.

But at least now (in 2020) there is no any reliable way to achieve what you want and see also an answer from Angular Core Team member about this topic

Answer 2

module.export={   plugins: [     new ExtractTextPlugin('[name].[contenthash].css'),     // Make sure this is after ExtractTextPlugin!     new PurifyCSSPlugin({       // Give paths to parse for rules. These should be absolute!       paths: glob.sync(path.join(__dirname, 'app/*.html')),     })   ]  }; 

install purifycss webpack first