Angular 5 - HttpClient Post Service not working

I am having trouble getting a service with httpClient post and I'm confused with different versions and depreciated code.

Here is what I have:

// dataService.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';

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

export class DataService {

  constructor(private http: HttpClient) {}

  insertData() {
    const body = JSON.stringify({firstName: 'Joel', lastName: 'Smith333'}),{headers: headers});
    return'http://myurl.somefile.php', body, httpOptions);


// app.component.ts
import { Component } from '@angular/core';
import { DataService } from './services/data.service';

  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
export class AppComponent {

  constructor(private dataService: DataService) {}

  myInsert() {
    if (this.dataService.insertData()) {
      alert('Data Inserted Successfully');



Open in new window

// app.component.html
<div class="btn btn-default" (click)="myInsert()">Click Me</div>

Open in new window

The issues are coming from the service...

httpOptions and the insertData functions has errors all over.

Can anyone please help to get this working with Angular 5 please?
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you've a typo line 17, you've a right parenthesis misplaced :
    const body = JSON.stringify({firstName: 'Joel', lastName: 'Smith333'}),{headers: headers});
    const body = JSON.stringify({firstName: 'Joel', lastName: 'Smith333'},{headers: headers});

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