notes/node_modules/autoprefixer/lib/hacks/filter.js

(function() {
  var Declaration, Filter,
    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    hasProp = {}.hasOwnProperty;

  Declaration = require('../declaration');

  Filter = (function(superClass) {
    extend(Filter, superClass);

    function Filter() {
      return Filter.__super__.constructor.apply(this, arguments);
    }

    Filter.names = ['filter'];

    Filter.prototype.check = function(decl) {
      var v;
      v = decl.value;
      return v.toLowerCase().indexOf('alpha(') === -1 && v.indexOf('DXImageTransform.Microsoft') === -1 && v.indexOf('data:image/svg+xml') === -1;
    };

    return Filter;

  })(Declaration);

  module.exports = Filter;

}).call(this);