function Root(defaults) {
        _classCallCheck(this, Root);

        var _this = _possibleConstructorReturn(this, _Container.call(this, defaults));

        _this.type = 'root';
        if (!_this.nodes) _this.nodes = [];
        return _this;
    }
Represents a CSS file and contains all its parsed nodes.

@extends Container

@example
const root = postcss.parse('a{color:black} b{z-index:2}');
root.type         //=> 'root'
root.nodes.length //=> 2