Usage: css-size [input] {OPTIONS}

Options:

    --version,    -v    Outputs the version number.

    --processor,  -p    Path to the postcss processor code. If omitted, defaults to cssnano.

    --options           Pass through options to the postcss plugin. For example,
                        if using cssnano, you can turn off unused rule removal
                        with `--no-options.discardUnused`.

    --help,       -h    Outputs this help screen.


The processor script should export a function that given a CSS string and the
command line options as arguments returns a Promise that resolves to an object
with a css property. Note that postcss's process method conforms to this API.

Example:

    var postcss = require('postcss');
    var mypostcssplugin = require('mypostcssplugin');
    module.exports = function(css, opts) {
      var plugin = mypostcssplugin(opts);
      return postcss([plugin]).process(css);
    }
