How to implement BarFunnel into chartjs-node

[HCodemesh]

I have tried to require BarFunnel.js as
require('./plugins/chart.barfunnel');

but I am getting following error

ReferenceError: Chart is not defined at Object.<anonymous> (D:\RacDevelopment\Nodejs\chartsservice\src\charts\plugins\chart.barfunnel.js:195:15) at Module._compile (module.js:652:30) at Object.Module._extensions..js (module.js:663:10) at Module.load (module.js:565:32) at tryModuleLoad (module.js:505:12) at Function.Module._load (module.js:497:3) at Module.require (module.js:596:17) at require (internal/module.js:11:18) at Object.<anonymous> (D:\RacDevelopment\Nodejs\chartsservice\src\charts\index.js:5:1) at Module._compile (module.js:652:30) at Object.Module._extensions..js (module.js:663:10) at Module.load (module.js:565:32) at tryModuleLoad (module.js:505:12) at Function.Module._load (module.js:497:3) at Module.require (module.js:596:17) at require (internal/module.js:11:18)

any solution to this?