I want to call a api method from api class while my request is in other class in Angular or Ionic

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//User Service

import Injectable from '@angular/core';
import Api from './api/api'; 
@Injectable()
export class User {
static signIn(data) : Promise<User>

return new Promise((resolve, reject) => 
 let seq = Api.post('login', JSON.stringify(email : 'ssss' , password: 
'ssss'));
 seq.subscribe((res: any) => 
 // If the API returned a successful response, mark the user as logged in
 if (res.status == 'success') 
 resolve(<User> res);
 else 
 
 , err => 
 alert('sssss')

 );

 return seq;
);

// Api Class code

import HttpClient, HttpParams from '@angular/common/http';
import Injectable from '@angular/core';
import 'rxjs/add/operator/map';
import Observable from 'rxjs/Observable';

/**
* Api is a generic REST Api handler. Set your API url first.
*/

@Injectable()
export class Api 

url: string = 'http://localhost:8100/assets/data';

 constructor(public http: HttpClient) 
 



 post(endpoint: string, body: any, reqOpts?: any) 

 return this.http.post(this.url + '/' + endpoint, body, reqOpts);

//please help me to resolve this issue

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لینک منبع