An implementation of nativescript Observable with a toJson method

Observable_.ts

export class Observable_ extends Observable {
    private _json: Object = {};

    constructor(key: string, args: Object) {
        super(args);
        this._json = (args != null && typeof args === 'object') ? args : {};//initialize object
    }

    public set(name: string, value: any) {
        this._json[name] = value;
        super.set(name, value);
    }

    public toJson() {
        return this._json;
    }
}