The source code

    /**
     * @ignore
     * uibase
     * @author yiminghe@gmail.com
     */
    KISSY.add("component/extension", function (S, Align, ContentBox, ContentBoxRender, Position, PositionRender, ShimRender) {
        Position.Render = PositionRender;
        ContentBox.Render = ContentBoxRender;
        return {
            Align: Align,
            ContentBox: ContentBox,
            Position: Position,
            Shim: {
                Render: ShimRender
            }
        };
    }, {
        requires: [
            "./extension/align",
            "./extension/content-box",
            "./extension/content-box-render",
            "./extension/position",
            "./extension/position-render",
            "./extension/shim-render"
        ]
    });