Angular-cli: CSS comments are not removed from minified bundles.

[coryrylan]

Versions

Angular CLI: 1.6.3
Node: 9.3.0
OS: linux x64
Angular: 5.1.2
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router, service-worker

@angular/cli: 1.6.3
@angular-devkit/build-optimizer: 0.0.36
@angular-devkit/core: 0.0.22
@angular-devkit/schematics: 0.0.42
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.3
@schematics/angular: 0.1.11
@schematics/schematics: 0.0.11
typescript: 2.4.2
webpack-bundle-analyzer: 2.9.0
webpack: 3.10.0

Repro steps

• CLI 1.6.1 css bundles removes comments. Update to 1.6.3 css bundles does not remove comments.
  My guess is this is a upstream issue with a dependency. I'm going to see if I can narrow down a isolated test using node sass.

[clydin]

Confirmed this occurs with 1.6.3. It does not happen on master which has improvements to the stylesheet optimization pipeline which will be in 1.7.

[coryrylan]

Looks like this was fixed in the latest 1.7 release of the CLI

[chrsmith]

@coryrylan I can confirm that single-line comments (//) are removed, but multi-line (/* */) are not. Is that expected? Should I open a new issue?

I'm seeing this on 1.7.3 of the CLI.

[adrianclaudiudima]

Still reproducing in 1.7.3 for multi-line.
For now you can run your production build using --extract-css=false.

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