Method overloading in Angular 4/2

I am now working with Angular 4. I have not found the correct solution for method overloading in Angular 2 or 4. Is it possible to implement method overloading in an Angular service class? Or I'm curious to know the details about this. Thanks in advance.

I just tried to compile the Service as shown below but found Dublicate Function Implementation Error

ApiService.ts :

import { Injectable } from '@angular/core';

@Injectable()
export class ApiService {

       constructor() { }

       postCall(url, data, token) { // with three parameters
                 return resultFromServer; }        

       postCall(url, data) { // with two parameters
                return resultFromServer;}          
       }

      

        
        
        
      

    

AuthenticationService.ts :

import { Injectable } from '@angular/core';
import { ApiService } from "app/_services/api.service";
import FunUtils from "app/_helper/utils";

@Injectable()
export class AuthenticationService {

    constructor(private api: ApiService) { }

    rest_login_call(userName, password) {
        let data = { username: userName, password: password };
        let url = "http://localhost:8000";
        return this.api.postCall(url, data);
    }

}