imported css not compressed

The contents of an inline imported a .css file (using --include-css) is not compressed by --compress argument.

normalize.css

/* normalize.css */
html {
    font-family: sans-serif;
}

style.styl

@import 'normalize.css'
/* start of CSS */
body {
  box-sizing: border-box;
}

Run stylus:

>stylus --include-css --compress style.styl
  compiled style.css

style.css

/*! normalize.css v0.0.1 */
html {
    font-family: sans-serif;
}
body{box-sizing:border-box}

In the resulting file, the contents of the .styl has been compressed, but contents of the .css file has not.

[Panya]

We’ll remove built-in compression in 1.0 version of Stylus because we think that tools for CSS optimization (like CSSO or cleancss) are better suitable for this task.

[laurentpayot]

Using dedicated CSS optimization tools makes sense, but it was a surprise for me to see my imported CSS not compressed with the --compress option. I was going to open an issue and found this one. To avoid surprises like this to new users it would be worth mentioning this behavior in the docs…