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+var path = require('path');

+var through = require('through');

+var postcss = require('postcss');

+var autoprefixer = require('autoprefixer');

+var requireFromString = require('require-from-string');

+

+/**

+ * Stringifies the content

+ * @param   {string}    content

+ * @returns {string}

+ */

+function stringify (content) {

+  return 'module.exports = ' + JSON.stringify(content) + ';\n';

+}

+

+module.exports = function (file, options) {

+

+  /**

+   * The function Browserify will use to transform the input.

+   * @param   {string} file

+   * @returns {stream}

+   */

+  function browserifyTransform (file) {

+    var extensions = ['.css', '.sass', '.scss', '.less'];

+    var chunks = [];

+

+    if (extensions.indexOf(path.extname(file)) === -1) {

+      return through();

+    }

+

+    var write = function (buffer) {

+      chunks.push(buffer);

+    };

+

+    var end = function () {

+      var contents = requireFromString(Buffer.concat(chunks).toString('utf8'));

+      contents = postcss([autoprefixer(options)]).process(contents).css;

+      this.queue(stringify(contents));

+      this.queue(null);

+    };

+

+    return through(write, end);

+  }

+

+  if (typeof file !== 'string') {

+    options = file;

+    return browserifyTransform;

+  } else {

+    return browserifyTransform(file);

+  }

+};