Can angular-cli remove unused css?

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

If you are using web pack then you can do it as:-

First, install purifycss-webpackusing npm i -D purifycss-webpack

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')),
    })
  ]

};

Visit the link below for the detailed understanding.

https://github.com/webpack-contrib/purifycss-webpack

Maybe you can have a look at https://github.com/Angular-RU/angular-cli-webpack. This gives you the possibility to change the webpack configuration without ejecting. And guess what the first example is: Removes unused selectors from your CSS. I have not tried it myself but it might be an option.

If you are ejected, i.e. ng eject. Then you can customize the webpack build to do most anything. I have a couple options turned on to minimize styles as part of the build with minifyCSS in two of the plugins.

LoaderOptionsPlugin

new LoaderOptionsPlugin({
  "sourceMap": false,
  "options": {
    "html-minifier-loader": {
        "removeComments": true,
        "collapseWhitespace": true,
        "conservativeCollapse": true,
        "preserveLineBreaks": true,
        "caseSensitive": true,
        "minifyCSS": true
    },

HtmlWebpackPlugin

new HtmlWebpackPlugin({
  "template": "./src\\index.ejs",
  "filename": "./index.html",
  "hash": true,
  "inject": true,
  "compile": true,
  "favicon": 'src/assets/Flag.png',
  "minify": {
      collapseWhitespace: true,
      removeComments: true,
      minifyCSS: true
    },

Don't know if this count as an answer because it's not really related to angular-cli, but I open my project in sublime text, and I launch UnusedCssFinder, which highlight all the unused properties in my css file.

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

来源：https://stackoverflow.com/questions/40330938/can-angular-cli-remove-unused-css

标签

css

Webpack

minify

angular-cli

angular2-aot