title: Angular Service and HttpClient Type does not exist
body: <p>I am trying to get a service working in Angular 5. This is what I have:</p>
  
  <pre><code>import { Injectable } from '@angular/core';
  
  
  @Injectable()
  export class DataService {
  
    constructor() { }
  
    getData() {
      // don't use 'any', type your data instead!
      return this.httpClient.get&lt;any&gt;('./assets/data.json');
    }
  
  }
  </code></pre>
  
  <p>I'm getting the following error:</p>
  
  <blockquote>
    <p>Property HttpClient does not exist on type DataService.</p>
  </blockquote>
  
  <p>What am I missing?</p>