Some YUI3 components, e g AutoComplete or Charts, have a lot of config to set up general look-and-feel, that you typically wish to reuse throughout the application. I have not found out a satisfying way to reuse such config. For instance, extending the C

yuiconfigreuse.js

YUI().use('charts', function (Y) {
    //Some config that i want to reuse for more or less all charts in my application
    var defaultConfig = function () {
        return {
            categoryType: "time",
            axes: {
                category: {
                    labelFormat: "%e %b"
                }
            },
            styles: {
                axes: {
                    category: {
                        label: {
                            rotation: -45
                        }
                    }
                }
            }
            //...And it goes on with ~ hundred lines of config 
        }
        
    };
    // Just some dummy data for the chart
    var myDataValues = [
        {category:"5/1/2010", values:2000},
        {category:"5/2/2010", values:50},
        {category:"5/3/2010", values:400},
        {category:"5/4/2010", values:200},
        {category:"5/5/2010", values:5000}
    ];
    
    //Merge the general "look-and-feel" kind of properties with the instance unique ones, with the latter taking precendence
    var finalConfig = Y.mix(defaultConfig(), {
        dataProvider: myDataValues,
        render: "#mychart"
    }, true, null, 0, true);
    
        // Instantiate and render the chart
    var mychart = new Y.Chart(finalConfig);
});
​