Ember js 2，在我的app.scss生产中使用scss @import不会删除最终CSS中的注释

Question

In my app.scss file I'm using

@import "./node_modules/bootstrap/scss/bootstrap";

because I'm using (and sometimes changing) some Bootstrap variable into my app.scss.

I found that with ember build -prod it doesn't remove comments from within Bootstrap imports in my final app.css.

So in my production css I have this:

/*!
 * Bootstrap v4.0.0-beta (https://getbootstrap.com)
 * Copyright 2011-2017 The Bootstrap Authors
 * Copyright 2011-2017 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */address,dl,ol,p,ul{margin-bottom:1rem}body,caption{text-align:left}........

Why?

How can I remove those superfluous comments?

Answer 1

/*! is a "special" comment due to the ! character at the end which will not be stripped from the build. It usually contains mandatory license information, which means that it would actually be illegal to strip it if you use any Bootstrap assets.