updated grunt-stripmq to work with css-media-match

Gruntfile.js

'use strict';

module.exports = function (grunt) {
    // Project configuration.
    grunt.initConfig({
        jshint: {
            all: [
                'Gruntfile.js',
                'tasks/**/*.js'
            ],
            options: {
                jshintrc: '.jshintrc'
            }
        },

        // Configuration to be run (and then tested).
        stripmq: {
            options: {
                width: 1024,
                type: 'screen'
            },

            all: {
                files: {
                    'test/output.css': ['test/input.css']
                }
            }
        }
    });

    // Actually load this plugin's task(s).
    grunt.loadTasks('tasks');

    // These plugins provide necessary tasks.
    grunt.loadNpmTasks('grunt-contrib-jshint');

    // By default, lint and run all tests.
    grunt.registerTask('default', ['jshint', 'stripmq']);
};

input.css

body {
    background: url('mobile-background.png');
}

@media screen and (min-width: 640px) {
    body {
        background: url('tablet-background.png');
    }
}

@media screen and (max-width: 800px) {
    body {
        background: url('until-800px-background.png');
    }
}

@media (min-width: 900px) {
    body {
        background: url('desktop-background.png');
    }
}

@media screen and (min-width: 1200px) {
    body {
        background: url('large-background.png');
    }
}

@media (monochrome) {
    body {
        background: black;
    }
}

output.css

body {
  background: url('mobile-background.png');
}

body {
  background: url('tablet-background.png');
}

body {
  background: url('desktop-background.png');
}

stripmq.js

'use strict';

var parse = require('css-parse'),
    stringify = require('css-stringify'),
    doesMQMatch = require('css-media-match');


function stripMediaQueries (ast, options) {
   ast.stylesheet.rules = ast.stylesheet.rules.reduce(function (tree, rule) {
        if (rule.type === 'media') {
            if (doesMQMatch(rule.media, options)) {
                tree.push.apply(tree, rule.rules);
            }
        }
        else {
            tree.push(rule);
        }
        return tree;
    }, []);
    return ast;
}

/**
 * strip media queries
 * @param   {string} input
 * @returns {string} output
 */
function StripMQ(input, options) {
    var tree = parse(input);
    tree = stripMediaQueries(tree, options);
    return stringify(tree);
}

module.exports = StripMQ;