gistfile1.js

    Ext.define('mynamespace.MySeries', {
        alias: 'series.myseries',
        extend: 'Ext.chart.series.Area',
        type: 'myseries'
    });
    
    var mySeriesInstance = Ext.createByAlias('series.myseries', {
        axis: 'left',
        xField: 'name',
        yField: ['data1', 'data2', 'data3'],
        style: {
            opacity: 0.93
        }
    });