Angular Remote service helper

remote.service.ts

import { RemoteHelper } from './remote';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { ROUTE } from './routes';

const {iget, ipost, iput, idelete } = RemoteHelper;

const headers = new HttpHeaders(
  {headers: ['Content-Type: application/json']}
)

@Injectable()
export class RemoteService {
  constructor(private http: HttpClient) { }

  /** 
  * Implement the helpers into this remote service 
  */

  /** GET service */
  get(endpoint: ROUTE, params: string) {
    return iget(this.http, headers, endpoint, params);
  }

  /** POST service */
  post(endpoint: ROUTE, body: any, params: string = null) {
    return ipost(this.http, headers, endpoint, body, params);
  }

  /** PUT service */
  put(endpoint: ROUTE, body: any, params: string = null) {
    return iput(this.http, headers, endpoint, body, params);
  }

  /** DELETE service */
  delete(endpoint: ROUTE, item: string|number) {
    return idelete(this.http, headers, endpoint, item);
  }

  /** Start calling the remote api */
  // signup(user: User) {
  //   return this.post(ROUTE.API_SIGNUP, user);
  // }
  //
  // deleteMessage(id: number) {
  //   return this.delete(ROUTE.API_MESSAGES, id);
  // }
}

RemoteHelper.ts

import { environment } from 'src/environments/environment';
import { HttpClient, HttpHeaders } from '@angular/common/http';

export class RemoteHelper {

    static params(p: string) {
        return p ? '?' + p.split(',').join('&') : ''; // Expecting query parameters in a string like 'id=3,level=8,page=1'
    }

    static path(endpoint: string) {
        return environment.api_base_url + '/' + environment.api_version + '/' + endpoint;
    }

    static iget(http: HttpClient, options: HttpHeaders, endpoint: string, params: string) {
        return http.get(RemoteHelper.path(endpoint) + RemoteHelper.params(params), {headers: options});
    }

    static ipost(http: HttpClient, options: HttpHeaders, endpoint: string, body: any, params = null) {
        return http.post(RemoteHelper.path(endpoint) + RemoteHelper.params(params), body, {headers: options});
    }

    static idelete(http: HttpClient, options: HttpHeaders, endpoint: string, item: string|number) {
        return http.get(RemoteHelper.path(endpoint) + '/' + item, {headers: options});
    }

    static iput(http: HttpClient, options: HttpHeaders, endpoint: string, body: any, params = null) {
        return http.post(RemoteHelper.path(endpoint) + '/' + body.id + RemoteHelper.params(params), body, {headers: options});
    }
}

routes.ts

/** List of routes invoked or navigated to in this app module */

export enum ROUTE {

    /** Navigation */
    BLANK = '',
    HOME = 'home',
    ABOUT = 'about',

    /** Api calls */
    API_SIGNUP = 'users',
    API_MESSAGES = 'messages'

}