Observable.prototype.debug = function(message: any) {   return this.do(     (next) => {       if(!environment.production) {         console.log(message, next);       }     },     (err) => {       if(!environment.production) {         console.error(message, err)       }     },     () => {       if(!environment.production) {         console.info("Observable completed", message)       }     }   );};declare module 'rxjs/observable' {  interface Observable
     
       {    debug: (...any) => Observable
      
         }}