Issue in adding Library files in tsconfig

Add it in the main plugin .ts where you have implemented the IVisual interface. 

In my case I was working with different library from jQuery. it might be different with that one as its a bit of a special case like D3.js when it comes to custom visuals. Your problem may be related to not having the proper typings installed though for jQuery UI if its a compile time problem you are encountering.

export class NetworkVisual implements IVisual {
    private _window : any;

    constructor(options: VisualConstructorOptions) {

        this._window = window;

        debugger;

        // this._window.jQuery should be available

    }

}